Answer:
C.
Explanation:
(Coronita virus)
17
Answer:
i dont know
Explanation:
Newton's universal law of gravitation says that every object exerts a force on another object. The shuttle has a gravitational force with Earth, the moon, and whatever planet it is near. This force prevents the shuttle from drifting.
Question 1 options:
True
False
Problem
Which of the following statements is true of a body that accelerates uniformly? Explain your
answer.
a. Its rate of change of position with time remains constant.
b. Its position changes by the same amount in equal time intervals.
c. Its velocity increases by increasing amounts in equal time intervals.
d. Its rate of change of velocity with time remains constant.
Explanation:
The acceleration of a body is defined as the rate of change of velocity per unit time. Its mathematical form is given by :
[tex]a=\dfrac{v-u}{t}[/tex]
Here,
u is initial speed of a body
v is final speed
t is time taken
Uniform acceleration means that the velocity of an object changes by an equal amount in every equal time period. Hence, the correct option is (c) " Its velocity increases by increasing amounts in equal time intervals".
4 in the diagram below the index of refraction of the air surrounding the prism is 1.00. The index of refraction of the prism for green-
blue light is 135 What must be true about the index of refraction of the prism for violet light?
A. The prism's index of refraction for violet light is greater than 1.35
B. The prism's index of refraction for violet light is equal to 1.35
C. The prisms index of refraction for violet light is less than 1.35
D. Nothing can be determined about the prism's index of refraction for violet light.
Answer:
C. The prisms index of refraction for violet light is less than 1.35Explanation:
The index of refraction, also called the refractive index, is a value calculated by the comparison of the movement of the light in two different environments.
Specifically, the index of refraction can be defined by
[tex]n=\frac{c}{v}[/tex]
Where [tex]n[/tex] is the refractive index, [tex]c[/tex] is the speed of the light in free space and [tex]v[/tex] is the speed of the light inside the medium.
However, the most important characteristic of this equation is the relation between [tex]n[/tex] and [tex]v[/tex], notice that they are inversely proportional. In other words, when the frequency increases, the refractive index decreases; when the frequency decreases, the refractive index increases.
Now, we know that green-blue light has lower frequency than violet light, which means the refractive index for violet light is gonna be less than 1.35, which is the index for green-blue light.
Therefore, the right answer is C.
What is meant by Compression and Rarefaction of a longitudinal wave?
Select the correct responses to the questions from the drop-down menus.
Which wind belt occurs at about about 5 degrees north and south of the equator?
Which wind belt starts at the horse latitudes and moves toward the poles?
Which winds are found primarily in the tropics?
Answer:
The first answer to the first column is Doldrums, the second is prevailing westerlies, the last answer is trade winds
Explanation:
I got this answer because I did it on the test
The wind belt that occurs at about about 5 degrees north and south of the equator is doldrums.
The wind belt that starts at the horse latitudes and moves toward the poles is the prevailing westerlies.
The winds that are found primarily in the tropics are trade winds.
Doldrums refer to the equitorial region of the Atlantic Ocean that has storms and unpredictable winds.
Prevailing westerlies are the winds that can be found in the middle latitudes which blow from high pressure area towards the pole. Trade winds are the east to west prevailing winds that flow in the equitorial region of the Earth.
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4. Solid ‘X’ turns into a liquid at 80 0C and into a gas at 140 0C. Describe the changes in the
particles of X when it is heated from
a. 70 0C to 85 0C
Answer:
Explanation:
The melting point of the solid is 80°C
Vapor point of the liquid is 140°C
What happens to particles of X when heated from 70°C to 85°C?
Firstly, there would be a phase change from solid to liquid. Below the melting point, a substance will exist as a solid. With increase in thermal energy inputted by heat, as the temperature climbs above the melting point, it changes to the liquid. When the solid begins to heat up, the particles of X starts vibrating about their fixed point. At they melting point, they break lose and flow to form a liquid. The particles will have more kinetic energy.Which pair of concepts are closely related?
O A. radiation and inertia
B. electric and magnetic forces
C. friction and gravity
D. entropy and momentum
Answer:
I believe it would be C. friction and gravity
Explanation:
They both deal with pulling/pushing objects.
How to atoms behave in non-magnetic items?
Answer:
By altering the quantum interactions of the electrons in the atoms of a metal's atoms, scientists from the University of Leeds have generated magnetism in metals that aren’t normally magnetic.
Explanation:
Question 4 of 10
2 Points
Which of the following is a cost of urban development?
O
A. Habitat fragmentation
O B. Entertainment
O C. Employment
O
D. Cultural centers
What is it
Habitat fragmentation is a cost of urban development.
Option: A
Explanation:
Though from the view point or perspective of up gradation and development urban development is much needed but in cost of habitat fragmentation which feels very bitter. As habitat fragmentation leads to the loss of habitat, disruption of ecological cycle and environmental equilibrium.
Actually in the name of urban development we the human use our bread giver environment in a wrong way which causes natural disasters in long run. Animals become endangered , vulnerable and extinct with passage of time. Because they forced to enter into human settlements.
Answer:
A
Explanation:
4. Identify Problems A student is describing a longitudinal wave in his notebook. He
writes down "The distance between crests is 3 cm." What is wrong with what the
student recorded?
Answer:
"The distance between crests is 3 cm."
Explanation:
If he writes down "The distance between crests is 3 cm."
That means he is describing the wavelength of a wave and not longitudinal wave. He ought to write something about " direction "
Longitudinal waves are waves in which the displacement of the medium is in the same direction as, or parallel to, the direction of propagation of the wave. While
Wavelength is the distance between the two successfully Crest or trough
What type of relationship does this graph show?
Mass vs. Acceleration
O
an inverse relationship
a positive relationship
a direct relationship
an independent relationship
O
Acceleration (mis)
0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00
Mass (kg)
The correct answer is an inverse relationship.
This is because according to the graph as the mass increases the acceleration decreases as shown by the downward curve.
can someone help pls!!
Answer:
Rp = 10 Ohms; I = 0.9 Amps
Explanation:
Since, there are two resistors each with 20Ω connected in parallel, the total resistance of the combination (Rp) of the circuit is as follows:
i.e 1/Rp = (1/R1 + 1/R2)
1/Rp = (1/20Ω + 1/20Ω)
1/Rp = (1 + 1)/20Ω
1/Rp = 2/20Ω
1/Rp = 1/10Ω
To get the value of Rp, cross multiply
Rp x 1 = 10Ω x 1
Rp = 10Ω
Apply the formula
Voltage V = Current I x Total resistance Rp
I = V/Rp
I = 9V/10Ω
I = 0.9 Amps
Thus, the total resistance is 10 Ohms, the current through the ammeter is 0.9 Amps
As we know that, if n resistances R1 , R2 and R3 .... Rn are joined in parallel the equivalent resistance is given as :
[tex] \boxed{ \sf{ \dfrac{1}{R_p} \: = \: \dfrac{1}{R_1}\: + \: \dfrac{1}{R_2} \: + \: \dfrac{1}{R_3} \: \: .... \: \dfrac{1}{R_n} }}[/tex]
R1 = 20Ω
R2 = 20Ω
Putting the values,
[tex]: \longmapsto \: \sf{ \dfrac{1}{R_p} \: = \: \dfrac{1}{20Ω}\: + \: \dfrac{1}{20Ω}}[/tex]
[tex]: \longmapsto \: \sf{ \dfrac{1}{R_p} \: = \: \dfrac{1 \times 1}{20}\: + \: \dfrac{1 \times 1}{20}}[/tex]
[tex]: \longmapsto \: \sf{ \dfrac{1}{R_p} \: = \: \: \dfrac{1 \: + \: 1}{20}}[/tex]
[tex]: \longmapsto \: \sf{ \dfrac{1}{R_p} \: = \: \: \dfrac{2}{20}}[/tex]
[tex]: \longmapsto \: \sf{ \dfrac{1}{R_p} \: = \: \: \cancel\dfrac{2}{20}}[/tex]
[tex]: \longmapsto \: \sf{ \dfrac{1}{R_p} \: = \: \dfrac{1}{10}}[/tex]
[tex]: \longmapsto \: \pink{\bf{R_p\: = \: 10Ω }}[/tex]
Current through the ammete:-
As we know that,
[tex]\boxed{ \sf{I \: = \: \frac{V}{R } }}[/tex]Here ,
I is current V is Volts R is resistancePutting the values,
[tex]\longmapsto \: \sf{I \: = \: \dfrac{9}{10 } }[/tex]
[tex] \longmapsto \: \red{\bf{I \: = \: 0.9}}[/tex]
The large piston in a hydraulic lift has an area of 250 cm2. What force must be applied to the small piston with an area of 25 cm2 in order to raise a car of mass 1500 kg?
Explanation:
Given that,
Area of large piston, [tex]A_1=250\ cm^2[/tex]
Area of small piston, [tex]A_2=25\ cm^2[/tex]
Force applied to large piston, [tex]F_1=m_1g=1500\times 10=15000\ N[/tex]
It is required to find the force applied to the small piston. The pressure in each chamber must be equal so, that,
[tex]\dfrac{F_1}{F_2}=\dfrac{A_2}{A_1}[/tex]
F₂ is force applied to smaller piston
[tex]F_2=\dfrac{F_1A_1}{A_2}\\\\F_2=\dfrac{15000\times 250}{25}\\\\F_2=150000\ N\\\\F_2=150\ kN[/tex]
So, the force of 150 kN must be applied to the small piston.
To raise the car using a hydraulic lift, a force of 1500 N must be applied to the small piston.
Explanation:To determine the force needed to raise a car using a hydraulic lift, we can apply the principles of Pascal's law. According to Pascal's law, the pressure in a fluid is transmitted equally in all directions. In this case, the pressure exerted on the larger piston is equal to the pressure exerted on the smaller piston. We can use the equation:
F1/A1 = F2/A2
Where F1 is the unknown force applied to the small piston, A1 is the cross-sectional area of the small piston, F2 is the weight of the car (mg), and A2 is the cross-sectional area of the large piston.
Given that A1 = 25 cm^2, A2 = 250 cm^2, and the mass of the car is 1500 kg, we can solve for F1:
F1 = (F2 * A1) / A2
Substituting the known values:
F1 = (1500 kg * 9.8 m/s^2 * 0.0025 m^2) / 0.025 m^2 = 1500 N.
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A ball is sitting at rest on the floor. What will happen if a balanced force is applied to the ball? *
(1 Point)
It will roll in the direction of the weakest force.
It will roll away from the force.
It will remain at rest.
a. If you set a cannonball to 1500 m/s, what happens? Explain why you think it moves this way.
Answer:
I beleive it would shoot very far up into the sky
Explanation:
Answer:It slows down and eventually gravity pulls it to ground and it stops
Explanation:
Air resistance slows it down
A 600 kg car is at rest, and then accelerates to 5 m/s.
What is its original kinetic energy?
What is its final kinetic energy?
How much work was used?
Answer:
0
7500J
7500J
Explanation:
Given parameters:
Mass of car = 600kg
Velocity = 5m/s
Unknown:
Original kinetic energy = ?
Final kinetic energy = ?
Work used = ?
Solution:
The kinetic energy of a body is the energy due to the motion of a body.
It can be solve mathematically using expression below;
K.E = [tex]\frac{1}{2}[/tex] m v²
where m is mass
v is velocity
original kinetic energy;
The car started at rest and v = 0, therefore K.E = 0
Final kinetic energy;
K.E = [tex]\frac{1}{2}[/tex] x 600 x 5² = 7500J
Work done:
Work done = Final K.E - Initial K.E = 7500 - 0 = 7500J
Answer:
0 ; 7500; 7500
Explanation:
Its correct I just completed it.
The highest occupiable floor of any building is in the Sears Tower in Chicago. The elevators of the central tower of the building lift passengers 436.0 m above street level. If a continuous forces of 22310 N is exerted on one of these elevator cars as it travels from the ground to the top floor, how much work is done on the elevator car by the elevator's lifting mechanism?
Answer:
9727160J
Explanation:
Given parameters:
Height of elevator rise = 436m
Force exerted = 22310N
Unknown:
Work done by the elevator lifting mechanism = ?
Solution:
The work done by a body is the force applied to move a body in a specific direction;
Work done = force x distance moved
In this case, the force and distance moved is provided already;
Work done = 22310 x 436 = 9727160J
The work done on the elevator car by the elevator's lifting mechanism is calculated using the work formula which is the product of the exerted force and the distance travelled, resulting in a total work of 9,731,160 joules.
Explanation:The question requires us to calculate the work done on an elevator car by the elevator's lifting mechanism. To find this out, we use the work formula:
Work (W) = Force (F) × Distance (d)
Given:
Force exerted on the elevator car, F = 22310 N Distance the elevator travels, d = 436.0 m
To calculate the work done, we multiply the force by the distance:
W = F × d
W = 22310 N × 436.0 m
W = 9,731,160 J
The work done by the elevator's lifting mechanism is 9,731,160 joules (J).
Which process requires the addition of energy to water?
Water must absorb energy in order to melt, evaporate, or get warmer.
How does lighting work?
Answer:
by power and electricity
Explanation:
Answer: Lighter, positively charged particles form at the top of the cloud. Heavier, negatively charged particles sink to the bottom of the cloud. When the positive and negative charges grow large enough, a giant spark - lightning - occurs between the two charges within the cloud.
Explanation:
HELP!
How high above the ground would a 500 kg roller coaster car be if it had 61 740 J of
gravitational potential energy?
Answer:
The solved problem is in the photo. Hope it helps.
A biker racer is moving 17km/he in a southernly direction. This is an example of_____
Answer:
This is an example of SPEED.
Answer: velocity
Explanation:
PLZ HELP ME i don’t get this
Explanation:
(i) Height of tree, h = 4 m
Mass of Ninja, m = 30 kg
The gravitational potential energy on the top branch of the tree is given by :
[tex]P=mgh[/tex]
g is acceleration due to gravity
[tex]P=30\ kg\times 9.8\ m/s^2\times 4\ m\\\\P=1176\ J[/tex]
(ii) If he were at a height of 2 meters from the ground, its potential energy will be :
[tex]P=mgh[/tex]
g is acceleration due to gravity
[tex]P=30\ kg\times 9.8\ m/s^2\times 2\ m\\\\P=588\ J[/tex]
Therefore, this is the required explanation.
57. Estimate Potential Energy A boulder with a
mass of 2,500 kg rests on a ledge that is 200 m
above a canyon floor. Estimate the gravita-
tional potential energy of the boulder-Earth
system relative to the canyon floor.
The gravitational potential energy of the boulder-Earth system relative to the canyon floor can be estimated as 4,900,000 Joules.
Explanation:The gravitational potential energy of an object is given by the formula PE = mgh, where m is the mass of the object, g is the acceleration due to gravity, and h is the height of the object above a reference point. In this case, the boulder with a mass of 2,500 kg rests 200 m above the canyon floor. So, the gravitational potential energy can be estimated as:
PE = (2,500 kg) * (9.8 m/s²) * (200 m) = 4,900,000 J (Joules).
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If the time is 0.2 seconds and the speed is 1500m/s what is the distance
Answer:
300m
Explanation:
D=S×T
D=1500×0.2
An electric circuit through which no current flows is known as?
Select the correct answer.
What is the electric field experienced by a charged balloon if the charge on the balloon is 9.4 x 10 coulombs and the force it experiences is 8.2
* 10^-2 newtons?
Answer:
8.37×10⁻⁴ N/C
Explanation:
Electric Field: This is the ratio of electrostatic force to electric charge. The S.I unit of electric field is N/C.
From the question, the expression for electric field is given as,
E = F/Q.......................... Equation 1
Where E = Electric Field, F = force experienced by the charged balloon, Q = Charge on the balloon.
Given: F = 8.2×10⁻² Newton, Q = 9.8×10 Coulombs = 98 Coulombs
Substitute these values into equation 1
E = 8.2×10⁻² /98
E = 8.37×10⁻⁴ N/C
Hence the Electric Field of the charged balloon = 8.37×10⁻⁴ N/C
Answer:
8.36*10^-4N/C
Explanation:
To find the electric field you use the following formula:
[tex]F=qE\\\\E=\frac{F}{q}[/tex]
F: electric force = 8.2*10^-2 N
q: charge of the balloon = 9.4*10 C
By replacing F and q you obtain:
[tex]E=\frac{8.2*10^{-2}N}{9.4*10}=8.36*10^{-4}\frac{N}{C}[/tex]
hence, the electric field is 8.36*10^-4N/C
what type of meter would be connected on both sides of the resistor in a circuit
the answer IS NOT "An ammeter, which measures current"
2 Points
Which of the following statements are not true about gravity? Check all that
apply.
A. Gravity exists only on Earth.
O
B. Gravity exists between two objects that have mass.
O
C. Gravity is a force that pulls two objects together.
D. Gravity exists in the whole universe.
E. Gravity doesn't exist between Earth and the sun.
Final answer:
Statements A 'Gravity exists only on Earth' and E 'Gravity doesn't exist between Earth and the sun' are not true about gravity. Gravity is a universal force that exists everywhere in the universe and acts between any two objects with mass, including Earth and the Sun.
Explanation:
Statements A and E given in the question are not true about gravity. These options should be checked as they do not accurately describe the gravitational force as we understand it in physics.
A. Gravity exists only on Earth. This statement is incorrect because gravity is a universal force that acts between any two objects that have mass, no matter where they are in the universe. It's not a phenomenon exclusive to Earth.
E. Gravity doesn't exist between Earth and the sun. This statement is false because there is a significant gravitational force between Earth and the Sun, which is responsible for keeping Earth in orbit around the Sun.
On the other hand, statements B, C, and D are accurate descriptions of gravitational force:
B. Gravity exists between two objects that have mass. This statement is true as the gravitational force is indeed a result of the mass of objects.
C. Gravity is a force that pulls two objects together. This is the basic definition of gravity - it attracts two bodies towards each other.
D. Gravity exists in the whole universe. Gravity is a fundamental force that acts everywhere in the universe, not just on Earth or within our solar system.
A boy is standing motionless on a skateboard. He throws a basketball forward. Describe his motion.
Answer:
Random motion
Explanation:
If the boy throws the basketball forward while at a position on the skateboard, the motion of the ball will be a random motion since we are not told if the ball is moving on a straight line when thrown forward.
In this case, the boy will tend to move in the direction of the ball. Since the ball is moving in a random manner, the motion of the boy will also be a random motion.
A random motion is a motion of a body in a zig zag manner. It is also known as Brownian motion e.g motion of a buzzing mosquito, motion of a smoke coming out of a chimney etc.
Why is lightning visible before thunder is heard?
A
Sound cannot reflect off surfaces as easily as light.
B
Sound travels slower than light can travel.
C
Sound is not processed by the brain as fast as light.
D
Sound needs a medium to travel through.
Answer:
B
Explanation: