Answer:
it must have lived through a long span of time
Answer:Option (1)
Explanation: Index fossil are those fossils that appears for a very short period of time in the geological time scale and has a wide geographical distribution. For example, Ammonites.
Index fossils are a good source for rock age determination and also it helps in the correlation of rocks.
Thus, the correct answer is option (1).
The gravitational force between two objects is zero… A. when the two objects are not moving. B. when another object lies in-between the two original objects. C. when the distance between them becomes extremely large. D. at a location halfway between the two objects. help me plz!!!!
Answer:
C. when the distance between them becomes extremely large
Explanation:
The gravitational force between two masses is:
F = GMm / r²
where G is the universal constant of gravitation,
M and m are the masses of the objects,
and r is the distance between the objects.
As r grows very large, F grows very small.
Answer:
v
Explanation:
how are breeder reactors different from nuclear reactors
Answer:
Breeder reactors are different from conventional nuclear reactors because they produce more fuel than they consume when producing energy and can re-use the plutonium they produce to fuel the reactor.
Explanation:
Nuclear reactors use uranium as a source of fuel to generate the required energy.These reactors produce less fissionable matter than they consume.For example, the amount of plutonium produced in nuclear rectors is less than that produced in Breeder reactors.In Breeder reactors, the plutonium produced can be separated and collected to be reused as fuel in the reactor.Additionally, breeder reactors use a coolant such as liquid sodium equipping the neutrons with high energy thus increasing the chances of the neutrons to be captured by uranium isotopes and be converted to plutonium.
A data table depicts the relationship between two or more _____ _.
variables
units
constants
axes
What are the two factors that determine the strength of the force of friction
between two sliding objects?
The frictional force between two sliding objects is given by:
F = μN
μ is the coefficient of kinetic friction, N is the normal force one object exerts on the other.
These are the two factors that influence the frictional force, the coefficient of friction and the normal force that the objects exert on each other.
The strength of the force of friction between two sliding objects is determined by the type of surfaces in contact and the normal force.
Explanation:The strength of the force of friction between two sliding objects is determined by two factors:
The type of surfaces in contact: Different materials have different levels of roughness, which affects the force of friction. For example, rough surfaces create more friction than smooth surfaces.The normal force: This is the force exerted by one object on another when they are in contact. The strength of the frictional force increases as the normal force increases.For example, if two objects with rough surfaces are in contact and the normal force between them is large, the frictional force will be strong. Conversely, if the surfaces are smooth and the normal force is small, the frictional force will be weak.
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The wave shown below is produced in a rope.
Which shows the motion of the rope at Point P as the wave passes through it?
Answer: B
Explanation:
Answer:B
Explanation:
A train consists of a diesel shunter of mass 100 tonnes pulling a truck of mass 25 tonnes along a level track. The engine is working at a rate of 125kW. The resistance to motion of the truck and shunter is 50N per tonne. (i)Calculate the constant speed of the train. While travelling at this constant speed, the truck becomes uncoupled. The shunter engine continues to produce the same power. (ii) Find the acceleration of the shunter immediately after this happens. (iii) Find the greatest speed the shunter can now reach.
Answer:
(i) 20 m/s
(ii) 0.00625 m/s²
(iii) 25 m/s
Explanation:
(i) The train moves at constant speed when it has no acceleration, meaning when the sum of the forces is zero.
There are two forces acting on the train. The force of the engine pushing the train forward, and the resistance.
∑F = ma
F − R = 0
F = R
The resistance is:
50 N/tonne × (100 tonne + 25 tonne) = 6250 N
Therefore, the force of the engine is 6250 N. The power of the engine is 125 kW. Power is work per time, and work is force times distance, so:
P = W / t
P = Fd / t
P = Fv
125000 Nm/s = (6250 N) v
v = 20 m/s
(ii) The truck becomes uncoupled. The engine is still pushing with 6250 N of force, but the resistance has changed to:
50 N/ton × 100 tonne = 5000 N
∑F = ma
F − R = ma
6250 N − 5000 N = (100 tonne × 2000 kg/tonne) a
a = 0.00625 m/s²
(iii) When the force of the engine matches the new resistance force:
P = Fv
125000 Nm/s = (5000 N) v
v = 25 m/s
The train's constant speed is 20 m/s. The acceleration of the shunter after the truck is uncoupled is 0.0125 m/s^2. The greatest speed the shunter can achieve, ignoring other physical limits, is 25 m/s.
Calculating Constant Speed, Acceleration, and Maximum Speed of a Shunter
Calculating constant speed: The total resistance to motion for both the diesel shunter and the truck is equal to the resistance force per tonne multiplied by the total mass. This gives a total resistance of (100+25) tonnes imes 50 N/tonne = 6250 N. Since the train is traveling at a constant speed, the power output of the engine is equal to the force times velocity (P = Fv), so the velocity v = P/F = 125000 W / 6250 N = 20 m/s.
Calculating the acceleration of the shunter: After the truck becomes uncoupled, the shunter's mass is 100 tonnes. The resistance force is now 100 tonnes * 50 N/tonne = 5000 N. The power output remains the same, so the available force for acceleration is P/v - resistance = 125000 W / 20 m/s - 5000 N = 1250 N. Acceleration a = F/m = 1250 N / (100 imes 1000 kg) = 0.0125 m/s2.
Finding the greatest speed of the shunter: Assuming there is no upper limit imposed by engine power or other factors, the greatest speed would be when the force output from power equals the resistance force: P/v = resistance. Therefore, maximum speed v = P / resistance = 125000 W / 5000 N = 25 m/s. However, in real-world scenarios, factors like engine capacity and gear ratios would limit the maximum speed.
A shuttle on Earth has a mass of 4.5 E 5 kg. Compare its weight on Earth to its weight while in orbit at a height of 6.3 E 5 meters above the surface of the Earth. Approximately what percent of its weight does the space shuttle retain?
11%
44%
83%
91%
Answer:
83%
Explanation:
On the surface, the weight is:
W = GMm / R²
where G is the gravitational constant, M is the mass of the Earth, m is the mass of the shuttle, and R is the radius of the Earth.
In orbit, the weight is:
w = GMm / (R+h)²
where h is the height of the shuttle above the surface of the Earth.
The ratio is:
w/W = R² / (R+h)²
w/W = (R / (R+h))²
Given that R = 6.4×10⁶ m and h = 6.3×10⁵ m:
w/W = (6.4×10⁶ / 7.03×10⁶)²
w/W = 0.83
The shuttle in orbit retains 83% of its weight on Earth.
The correct option is c) 83%.
Given :
A shuttle on Earth has a mass of [tex]4.5\times 10^5[/tex] kg.
Shuttle is at height of [tex]6.3\times 10^5[/tex] meters above the surface of the Earth.
Solution :
On the surface of Earth, the weight is
[tex]\rm W = \dfrac{GMm}{R^2}[/tex] ---- (1)
Where,
G is the gravitational constant,
M is the mass of the Earth,
m is the mass of the shuttle,
R is the radius of the Earth.
In orbit the weight is,
[tex]\rm w = \dfrac{GMm}{(R+h)^2}[/tex] ----- (2)
Now we take the ratio of equation (2) to (1),
[tex]\rm \dfrac{w}{W}= \dfrac{R^2}{(R+h)^2}[/tex] ----- (3)
Now put the values of R and h in equation (3) we get,
[tex]\rm \dfrac{w}{W} = 0.83[/tex]
= 83%
Therefore, the correct option is c) 83%
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A runner has an initial velocity of 4 meters per second. After 20 seconds, the runner's velocity is 6 meters per second. Which is the runner's acceleration?
A.
1 meter/second/second in the same direction of travel
B.
0.1 meters/second/second in the same direction of travel
C.
–1 meter/second/second in the same direction of travel
Answer:
B. 0.1 meters/second/second in the same direction of travel.
Explanation:
Acceleration is the rate of change of velocity. Acceleration is a vector quantity.
a=Δv/Δt
=(v₂-v₁)/(t₂-t₁)
v₁=4 m/s
v₂=6 m/s
t₁=0 s
t₂=20 s
a=(6m/s-4m/s)/(20s-0)
= 0.1 m/s² in the same direction of travel.
Therefore acceleration =0.1 meters/second/second in the same direction of travel.
The acceleration of runner is [tex]\bold{0.1 \ m / s^{2}}[/tex] if his initial velocity is 4 m⁄s and after 20 seconds the runner's velocity is 6 m⁄s.
Option: B
Explanation:From given we came to know that the runner starts his initial velocity is 4 , and in 20 s speeds up to 6 m⁄s, to find acceleration of runner, we know that acceleration is ratio of change in velocity to change in time.
The acceleration is given by the formula:
[tex]\text { Acceleration }=\frac{\text { Change in velocity }}{\text { Change in time }}[/tex]
We know that change in velocity as 4 m/s to 6 m/s and change time as 20 s.
[tex]\Rightarrow \text { Acceleration }=\frac{6-4}{20}[/tex]
[tex]\therefore \text { Acceleration }=0.1 \ \mathrm{m} / \mathrm{s}^{2}[/tex]
Therefore, acceleration of runner will be [tex]0.1 \ m / s^{2}[/tex]
A famous physics tale is about a rich man who was found dead. He was
stuck in the middle of a frozen lake where the ice was completely
frictionless, making it impossible to walk. The man was found clutching a
heavy bag of money, with which he could have saved himself had he not
been so miserly.
How could the rich man have saved himself using Newton's third law?
A)He could have thrown the money upwards, creating a vertical
reaction force on himself.
B)He could have dropped the bag of money, creating a horizontal
reaction force on himself.
C)He could have thrown the bag of money sideways, creating a
horizontal reaction force on himself.
D)He could have thrown the money upwards, creating a horizontal
Explanation:
According to Newton's third law of motion, when two bodies interact between them, appear equal forces and opposite senses in each of them.
To understand it better:
Each time a body or object exerts a force on a second body or object, it (the second body) will exert a force of equal magnitude and direction but in the opposite direction on the first.
So, if the rich man had pushed the bag of money horizontally opposite of where he was, he could have saved himself.
Which describes the adiabatic process? Check all that apply.
Heat is released from the system.
Heat is not absorbed by the system.
A rapid shift occurs between gas compression and expansion.
A rapid expansion of gas is caused by a temperature decrease.
All heat is transformed to work done by the system.
Answer:
heat is not absorbed by the system
A rapid shift occurs between gas compression and expansion.
All heat is transformed to work done by the system.
Explanation:
Adiabatic processes involve no heat transfer to or from the system, often due to the insulation or speed of the process. Temperature decreases during expansion because internal energy does work, and increases during compression as work is done on the system. So the correct options are second, third, and fourth statements.
Explanation:An adiabatic process describes a thermodynamic change in which no heat is transferred into or out of the system. This can mean that the system is well insulated or that the process happens so quickly there's no time for heat transfer. During adiabatic expansion of a gas, the temperature decreases because internal energy is converted to work done by the system, and in adiabatic compression, the temperature increases because work is done on the system, increasing its internal energy.
Heat is not absorbed by the system.A rapid shift occurs between gas compression and expansion.A rapid expansion of gas is caused by a temperature decrease because the internal energy of the gas is used to do work.All heat being transformed to work done by the system can be a characteristic of an adiabatic process, particularly in the case of an ideal adiabatic process where no heat is exchanged and all energy changes in the system are due to work.
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• The water displaced by the brick had a volume of 0.96 liters, which tells you that
a. the brick's volume was 0.96 liters.
b. the brick's volume was 9.6 liters.
c. the brick's volume was 0.96 milliliters.
d. the brick's weight was 960 milliliters.
Answer:
a. the brick's volume was 0.96 liters.
Explanation:
A brick is denser than water, so it sinks. So the volume of water the brick displaces is equal to the brick's total volume.
Volume is a three-dimensional scalar quantity. The water displaced by the brick had a volume of 0.96 liters, which tells that the brick's volume was 0.96 liters. The correct option is A.
What is volume?A volume is a scalar number that expresses the amount of three-dimensional space enclosed by a closed surface.
As it is known that volume occupies space, now, if the brick is put in water and it takes the place of water, therefore, the volume of the brick will be the same as the volume displaced by it.
Hence, The water displaced by the brick had a volume of 0.96 liters, which tells that the brick's volume was 0.96 liters.
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Which of the following is a characteristic of electromagnetic waves?
They are all visible
They have a purely particle nature.
They can travel with or without a medium.
They cannot travel very fast.
PLS ANSWER ASAPPP!!!
Answer:
the answer is c
Explanation:
mechanical waves must travel through a medium but electromagnetic waves do not have to
To achieve a speed of 2 m/s, the bottle must be dropped at m. To achieve a speed of 3 m/s, the bottle must be dropped at m. To achieve a speed of 4 m/s, the bottle must be dropped at m. To achieve a speed of 5 m/s, the bottle must be dropped at m. To achieve a speed of 6 m/s, the bottle must be dropped at m.
Answer:
[tex]\begin{array}{l|l}\text{Speed}\; \mathrm{(m\cdot s^{-1})} & \text{Minimum Height\;(m)}\\\cline{1-2}\\[-1em] 2 & 0.204\\3&0.459\\4 & 0.815\\5 & 1.27 \\6 & 1.83\end{array}[/tex].
Assumptions:
The object is dropped in a free fall.There's no air resistance.The downward acceleration due to gravity is [tex]\rm 9.81\;m\cdot s^{-2}[/tex]Explanation:
Consider the "SUVAT" equation
[tex]\displaystyle \frac{v^{2} - u^{2}}{2a} = x[/tex],
where
[tex]v[/tex] is the final velocity,[tex]u[/tex] is the initial velocity,[tex]a[/tex] is the acceleration of the object, and[tex]x[/tex] is the change in the object's position.For example, if the bottle needs to achieve a speed of [tex]v = \rm 2\; m\cdot s^{-1}[/tex] by the time it reaches the ground,
[tex]u = 0[/tex] since the statement that the bottle is "dropped" implies a free fall.[tex]a = g = \rm 9.81\;m\cdot s^{-2}[/tex].Apply the previous equation to find the minimum height, [tex]x[/tex]:
[tex]\displaystyle x = \frac{v^{2} - u^{2}}{2a} = \rm \frac{\left(2\; m\cdot s^{-1}\right)^{2}}{2\times 9.81\; m\cdot s^{-2}} \approx 0.204\; m[/tex].
Replace the [tex]v[/tex] value and apply the formula to find the minimum height required to reach different final speeds.
Answer:
0.20
0.46
0.82
1.28
1.84
Explanation:
To achieve a speed of 2,3,4,5,6 m/s, the bottle must be
Which weathering process is mechanical
Mechanical weathering is the physical breakdown of rock by environmental factors. This process is always at work, and there are a number of different types of mechanical weathering. Thermal expansion is the tendency for minerals to expand and contract based on temperature.
Answer:Mechanical weathering is actually breaking down of rocks into smaller pieces by natural forces. Any weathering processes that can cause the physical breakdown of rocks without any type of change in the chemical composition of rocks, called mechanical weathering.
Exfoliation: It's a process where the rocks erodes by peeling off in sheets or layer by layer rather than grain by grain.
Explanation:therefore exfoliation will match the answer to your question
A cyclist is riding his bike at a constant speed of S m/s, and experiences a frictional force between the bike and sidewalk of 100 N. The cyclist then changes his speed to 10 m/s What effect does this increase in speed have on the frictional force between the bike and sidewalk?
A) the frictional force doubles because when speed increases frictional force also increases
B) the frictional force becomes half of what it was because when speed increases frictional force decreases
C) the frictional force increases but does not double because although friction increases with the increasing speed it does not increase as fast
D) the frictional force between the bike and sidewalk stays the same because speed does not affect frictional force
Answer:
D) the frictional force between the bike and sidewalk stays the same because speed does not affect frictional force
Explanation:
Friction force is equal to normal force times the coefficient of friction. Since neither of those changes as speed increases, then the friction force stays the same.
Is the universe endless, how and why?
Answer:
Unknown
Explanation:
Because we cannot observe space beyond the edge of the observable universe, it is unknown whether the size of the Universe in its totality is finite or infinite.
The given statement is true, that is, the universe is endless due to the fact that it is not limited with a specified boundary.
Explanation:
Universe has unimaginable length and width due to the limit of the present day science and technological adaptation because of which we haven’t explored the full universe yet. The world in which we live is the Earth which has been cartographed and studied well along with the Milky Way galaxies.
But beyond this, there are thousands and millions of galaxies which has not been studied. Then there is a frame of reference of study with the dimensional frame where we have been adept to 3 dimensions only and the [tex]4^{th}[/tex] dimension is yet to be studied.
The temperature in a room is 56 degrees celcius . What would the velocity of a sound wave be at this temperature ?
Answer:
365 m/s
Explanation:
The velocity of sound in air is approximated as:
v ≈ 331.4 + 0.6 T
where v is the velocity in m/s and T is the temperature in Celsius.
At T = 56:
v ≈ 331.4 + 0.6 (56)
v ≈ 365.0
The velocity is approximately 365 m/s.
Final answer:
The speed of sound in air at 56°C is approximately 364.6 m/s, calculated using the temperature-dependent formula for the speed of sound.
Explanation:
The speed of sound in the air increases as the temperature rises. At 0°C, the speed of sound is about 331 m/s. The speed of sound can be approximated using the formula:
v = v0 + (0.6 × t)
Where:
v is the speed of sound at the desired temperature in m/s.v0 is the speed of sound at 0°C, which is 331 m/s.t is the temperature in degrees Celsius.At a temperature of 56°C, the speed of sound can be calculated as follows:
v = 331 m/s + (0.6 m/s/°C × 56°C)
v = 331 m/s + 33.6 m/s
v = 364.6 m/s
Thus, the speed of sound in air at 56°C is approximately 364.6 m/s.
Acceleration is the magnitude of average velocity.
False. Acceleration is not the magnitude of average velocity.
What is acceleration?Acceleration is the rate at which an object's velocity changes over time. It is a vector quantity and is defined as the change in velocity divided by the change in time.
Mathematically the formula for acceleration is given as;
a = Δv / Δt
where;
Δv is the change in velocityΔt is the change in timeAverage velocity, on the other hand, is the displacement of an object divided by the time taken. It is also a vector quantity and is defined as the change in position divided by the change in time.
Thus, we can conclude that acceleration is not the magnitude of average velocity.
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The complete question is below:
Acceleration is the magnitude of average velocity. True/False?
Acceleration is not the magnitude of average velocity but is the rate at which velocity changes in terms of magnitude or direction. Calculated by dividing the change in velocity by the time interval, it is a vector with its own SI unit of m/s². Average acceleration differs from instantaneous acceleration and can be positive, negative, or zero.
Explanation:The statement 'Acceleration is the magnitude of average velocity' is incorrect. Instead, acceleration is defined as a change in velocity, which can be in terms of magnitude or direction, or both. When you have a change in velocity (∆v) over a time interval (∆t), the average acceleration (αavg) is calculated. This is expressed as α = ∆v/∆t. The SI units for acceleration are meters per second squared (m/s²).
Acceleration is always a vector, meaning it has both magnitude and direction. It is important to note that acceleration does not just involve an increase in speed; it includes any change in velocity, including reduction in speed (deceleration) and changes in direction. Average acceleration differs from instantaneous acceleration, which is the rate of change of velocity at a specific point in time. To understand average acceleration, one should consider the total change in velocity and the total time over which this change occurred, without needing to know every single instantaneous rate of change.
A body initially at rest explodes into two masses M1 and M2 that moves apart with speeds v1 and v2 respectively. what is the ratio v1/v2?
a)-M2/M1
b)M2/M1
Answer:
a)-M2/M1
Explanation:
Momentum is conserved:
M₁ v₁ + M₂ v₂ = 0
M₁ v₁ = -M₂ v₂
v₁ / v₂ = -M₂ / M₁
In the given physical scenario, by adhering to the conservation of momentum, you can find the ratio of the speeds v1/v2 which is represented by -M2/M1.
Explanation:From the conservation of momentum, we might deduce that the total momentum of a system of particles is constant if there is no resultant external force. Before the explosion, the body was at rest, indicating that its total momentum was zero. After the explosion, the total momentum should still be zero. Hence, the momentum of M1 moving at speed v1 should be equal but opposite to the momentum of M2 moving at speed v2. This is represented mathematically as M1*v1 = M2*v2. By rearranging this equation, we can find the ratio v1/v2 which equals -M2/M1.
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The absolute temperature corresponding to 200°C is
a) 73 K
b) 73 K
c) 473 K
d) 427 K
Answer:
C) 473 K
Explanation:
The conversion from Celsius to Kelvin is:
K = C + 273.15
So if the temperature is 200 °C:
K = 200 + 273.15
K = 473.15
Which is approximately answer C.
The absolute temperature corresponding to 200°C is 473 K. This is calculated by adding 273.15 to the Celsius (in accordance to the Celsius-Kelvin conversion formula) and rounding to the nearest whole number.
Explanation:The absolute temperature measurement is typically done in Kelvin (K), which is the temperature scale used in science because it is an absolute temperature scale. Zero degrees on the Kelvin scale, known as absolute zero, is theoretically the point at which molecular motion ceases, producing no thermal energy. A useful thing about the Kelvin scale is that it corresponds directly with the Celsius temperature scale, with a linear shift of 273.15 degrees. In other words, if you want to convert from Celsius to Kelvin, you simply add 273.15 to the Celsius temperature.
In the case of the given temperature of 200 degrees Celsius, the conversion to Kelvin would be 200 + 273.15 = 473.15 K.
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Dale and Alex push on opposite sides of a couch. Dale pushes to the left with
a force of 100 N, while Alex pushes to the right with a force of 175 N. If the
couch has a mass of 55 kg, what is the acceleration of the couch?
O A. 5 m/s2 right
O B. 5 m/s2 left
O c. 1.4 m/s? right
O D. 1.4 m/s2 left
SUBMIT
Answer:
C. 1.4 m/s² right
Explanation:
Apply Newton's second law. Take right to be positive and left to be negative:
∑F = ma
175 N − 100 N = (55 kg) a
a = 1.4 m/s²
The couch accelerates to the right at 1.4 m/s².
To find the acceleration of the couch, use Newton's second law of motion, which states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration. The net force is calculated by subtracting the forces applied by the two individuals pushing in opposite directions. By plugging in the given values and solving the equation, the acceleration of the couch is found to be approximately 1.4 m/s² to the right.
Explanation:To find the acceleration of the couch, we need to use Newton's second law of motion, which states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration. In this case, the net force is the difference between the forces applied by Dale and Alex, since they are pushing in opposite directions.
The net force can be calculated as 175 N (force applied by Alex) minus 100 N (force applied by Dale), which equals 75 N. The mass of the couch is given as 55 kg. Plugging these values into the equation, we get:
Net force = mass × acceleration
75 N = 55 kg × acceleration
Dividing both sides of the equation by 55 kg gives us:
acceleration = 75 N ÷ 55 kg ≈ 1.4 m/s²
Since the net force is positive (to the right) and greater than zero, the acceleration of the couch is also to the right. Therefore, the correct answer is 1.4 m/s² right (option C).
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There are 11 lights in series, and they are in series with 2 lights in parallel. If the 13 lights are identical, which of them will burn brightest?
11 lights
2 lights
all 13 lights
none will be brightest
OPTION 3.
In a circuit, when identical lights are connected in series, they have the same current and burn with the same brightness. Similarly, when identical lights are connected in parallel, they each have the same voltage and burn with the same brightness. Therefore, all 13 lights in the given arrangement will burn with the same brightness.
Explanation:In electrical circuits, when identical lights are connected in series, they all have the same current through them and therefore they all burn with the same brightness. On the other hand, when identical lights are connected in parallel, they share the total voltage (thus each having the same voltage as if it were alone) and they also burn with the same brightness. Therefore, in this case where there are 11 lights in series, and they are in series with 2 lights in parallel, and all 13 are identical, all of them will burn with equivalent brightness. Thus the option 'all 13 lights' is the correct answer.
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Considering the properties of series and parallel circuits and given all 13 lights are identical, they will all shine with the same brightness. Therefore, none of the lights will burn the brightest.
Explanation:In a series circuit, the electrical current is the same through all the components, which in this case are the lights. Therefore, since the 11 lights are in series and have the same current, they will all shine with the same brightness. However, these 11 lights are in series with 2 in parallel. In parallel circuits, the voltage across each component (here, the lights) is the same. So, the 2 lights in parallel will also shine with the same brightness. Because all 13 lights are identical and considering how series and parallel circuits work, all will have the same brightness. Therefore, none of the options will burn the brightest.
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4. A 1,000-kilogram satellite completes a uniform circular orbit of radius 8.0 x 10 meters as
measured from the center of Earth. The mass of Earth is approximately 6.0 x 10-7 kilograms,
and the universal gravity constant is approximately 7.0 x 10-11 N•m/kg. Determine the
work done by gravity as the satellite completes one full orbit around Earth.
Answer:
Zero
Explanation:
The work done by a force on an object is given by:
[tex]W=Fd cos \theta[/tex]
where
F is the magnitude of the force
d is the displacement of the object
[tex]\theta[/tex] is the angle between the direction of the force and the displacement of the object
In this situation, the force is the force of gravity acting on the satellite. This force always points towards the centre of the trajectory, so it is always perpendicular to the direction of motion of the satellite (since the orbit is circular), so [tex]\theta=90^{\circ}[/tex] and [tex]cos \theta =0[/tex]. Therefore, the work done by gravity is also zero.
Answer:
zero
Explanation:
on edg.
3. In which activity is no work done?
Answer:
Sleeping, since your brain is working, but your physical body is not moving at all or moving rarely, therefore there is no work done in the activity of sleeping.
Explanation:
Difference between emitter and absorbers
An emitter allows things to pass through a surface from inside to outside.
An absorber allows something to pass through it from the outside to the inside.
Answer/Explanation:
Shiny surfaces are poor absorbers and emitters (but they are good reflectors of infrared radiation). If two objects made from the same material have identical volumes, a thin, flat object will radiate heat energy faster than a fat object. This is one reason why domestic radiators are thin and flat.
Which of the following factors could you change in a system and not change its induced EMF?
A.
magnetic field
B.
type of wire
C.
velocity of the wire
D.
length of the wire in the field
Answer:
The type of wire
Explanation:
E=Blv
Answer:
The type of wire
Explanation:
The EMF is induced in the closed conducting loop whenever there is a change in the magnetic flux linked with it. Mathematically, it is given by :
[tex]\epsilon=\dfrac{-d\phi}{dt}[/tex]
Where
[tex]\phi[/tex] is the magnetic flux
[tex]\phi=B.A[/tex]
[tex]\epsilon=\dfrac{-d(BA)}{dt}[/tex]
For n number of coils,
[tex]\epsilon=\dfrac{-d(NBA)}{dt}[/tex]
Where
B is the magnetic field
A is the area of the coil
If the coil is moved with the speed of v in the magnetic field, then induced EMF is given by :
[tex]\epsilon=Blv[/tex]
l is the length of the coil
So, the induced EMF depends on the following factors:
magnetic fieldvelocity of the wirelength of the wire in the fieldSo, the type of wire do not change the induced emf of the coil. Hence, the correct option is (b).
Which of the following are steps for balancing chemical equations?
Check all that apply.
] A. Multiply the reactants to get the products.
B. Change subscripts.
O
C. Recheck the numbers of each atom on each side of the equation
to make sure the sides are equal.
D. Choose coefficients that will balance the equation.
Answer:
C. Recheck the numbers of each atom on each side of the equation
to make sure the sides are equal.
D. Choose coefficients that will balance the equation
Explanation:
In balancing of chemical equation, the number of atoms on both sides must be equal in adherence to the law of conservation of mass.
Using the method of inspection, the equation is first observed to know the relationship between the combining atoms and the resulting ones.
After observing the reaction, put a coefficient that will balance the equation. Then recheck the number of each atom on both side of the equation. One can repeat the process till the equation is balanced.
The steps of balancing a chemical equation include rechecking the numbers of each atom and choosing coefficients that will balance the equation. Options A and B are not part of the balancing process.
Explanation:To balance a chemical equation, you normally adhere to a few critical steps. These do not include options A and B. You should not multiply reactants to get products, and you shouldn't change subscripts, which would alter the nature of the substances involved. You should,
C. Recheck the numbers of each atom on each side of the equation to ensure that both sides have equal numbers of each type of atom, D. Choose coefficients that will balance the equation by making sure the number of atoms for each element is the same on both the reactant and product sides of the equation.Balancing chemical equations aims to observe the law of conservation of mass, which states that matter can neither be created nor destroyed.
Learn more about Balancing Chemical Equations here:https://brainly.com/question/28294176
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The force on an object is given by the equation F= ma. In this equation, Fis
the force, m is the mass, and a is the acceleration. What is the force on an
object that has a mass of 3.4 kg and an acceleration of 8.1 m/s??
O A. 4.7 N
O B. 11.5 N
O C. 27.5 N
O D. 2.4N
Answer:
C. 27.5 N
Explanation:
F = ma is the equation given to you, in which:
F = force
m = mass = 3.4 kg
a = acceleration = 8.1 m/s
Plug in the corresponding numbers to the corresponding variables:
F = (3.4)(8.1)
F = 27.54
C. 27.5 N is your closest answer when rounded to the nearest tenths.
~
Answer:
C. 27.5 N
Explanation:
The force on an object that has a mass of 3.4 kg and an acceleration of 8.1 m/s is 27.5 N.
F = (3.4)(8.1)
F = 27.54
What is the slope of a constant velocity
if it is a displacement time graph, It will increase upwards in a straight line.
If it is a velocity time graph it will remain as a straight horizontal line
If it is an acceleration time graph there will be a horizontal straight line at 0
A pole vaulter takes 1.3 seconds to fall from peak height to the landing mat. What is his vertical velocity at contact with the mat?
[tex]12.75 \frac{m}{s}[/tex]
Assuming vertical acceleration of [tex]9.81 \frac{m}{s^2}[/tex], the speed after x seconds of falling is [tex]9.81x \to 9.81(1.3) = 12.75[/tex]