Answer:
F=I/Δt
F=2000/7
F=285.7 N
Explanation:
Final answer:
Explanation:
The student is asking a physics question related to the concept of impulse and force. Impulse, represented by the product of force and time, is equivalent to the change in momentum of an object. The question involves calculating the force applied by Troy when he pushes on a car for 7 seconds, with a given impulse of 2000 kg·m/s.
To find the force applied, we use the formula for impulse: impulse = force × time. Thus, force can be calculated by dividing the impulse by the time over which the force is applied. Given that the impulse is 2000 kg·m/s and the time is 7 seconds, the force applied by Troy can be calculated as:
Force = Impulse / Time = 2000 kg·m/s / 7 s = 285.71 N
Therefore, the force Troy applies to the car is 285.71 Newtons.
What is the melting point of substance A?
Heating Curve of Substance A
600
500
400
E
Temperature (Cº)
300
200
100
Heat Added (J)
Answer:
Solids are easily recognized by their ability to retain a fixed shape and definite volume. Particles making
up a solid are held together in a rigid form. They are not free to move about or slide past one another and
the solid does not have the ability to flow. (Although the particles of a solid do not move position to position, they do have motion in that they are constantly vibrating.
To change the temperature of a solid, heat energy must be added. The amount of heat energy that changes
the temperature of 1.0 g of a solid by 1.0°C is called its specific heat (c). Each substance has its own
specific heat. The specific heat of ice is 2.1 Joules/g°C. In other words we must supply 1.0 gram of ice
with 2.1 Joules of heat energy to raise its temperature by 1.0 °C.
The general equation for calculating heat energy to change the temperature of a solid is:
Heat = Mass x Specific Heat (solid) x Temperature Change
Q = m c DT
10 g 10 g 10 g 10 g 10 g 10 g
Calculate the heat necessary to change 10 g of ice(s) at -20 °C to 10 g of ice(s) at 0°C. (A-B)
Q = mc∆T = (10 g) (2.1 J/g°C) (20°C) = 420 J
If you continue to add heat energy once the temperature of the ice reaches 0°C , the heat absorbed is called
the heat of fusion (Lf). This heat is used to cause a change of phase (from a solid to a liquid). This heat is
increasing the potential energy of the molecules of the solid. No temperature change takes place. Each
substance has its own heat of fusion. The heat of fusion for ice is 340 Joules/g. Exactly the same amount
of heat is given up when 1.0 g of water is changed to ice. This heat is called the heat of crystallization.
The general equation for calculating heat energy to change a solid to a liquid is:
Heat = Mass x Heat of Fusion
Q = m Lf
Calculate the heat necessary to change 10 g of ice(s) at 0°C to 10 g of water(l) at 0°C.(B-C)
Explanation:
Q = mLf = (10 g)( 340 J/g) = 3400 J
Answer:
Correct Answer: 200° C
Explanation:
Have a great day!
2. A 60 N net force is applied to a 12 kg box.
What is the acceleration of the box?
Answer:
A = 5 meters/s^2
Explanation:
Force = mass x acceleration
A = Force/mass
A = 60/12
A = 5 meters/s^2
A student is building a simple circuit with a battery, light bulb, and copper wires. When she connects the wires to the battery terminals, the light bulb does not light up. Which of the following could explain why the bulb does not light?
A. The is no energy source.
B. The circuit is open.
C. This circuit is too simple to light up a light bulb.
D. Copper wires do not conduct electric current.
Option B represents the correct answer.
The Bulb does not light up because the circuit is an open circuit.
Open and Closed CircuitAn electrical circuit where the energy is not flowing through the circuit is called the open circuit. In the open circuit, the continuity is broken so that the current does not flow through the circuit.
An electrical circuit where the energy is allowed to flow through the circuit by turning it on is called the closed circuit. A circuit is made closed if the electricity is flowing from an energy source to the desired endpoint of the circuit.
Given that a simple circuit is built up by a student. The circuit is made with a battery, light bulb, and copper wires. The light bulb does not light up when the copper wires are connected to the battery terminals because there is no energy flow through the circuit. It means that the circuit is an open circuit.
Hence we can conclude that the light bulb does not light up due to the no energy flow in the circuit. Option B is the correct answer.
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Placed exactly between two oppositely charged point charges, a test charge (the
sensor) will show?
A) Zero force
B) Minimum force
C) Maximum force
D) Option 4
Placed exactly between two oppositely charged point charges, a test charge will show zero force. Thus, the correct option is A.
What is a Test charge?A test charge is a very small positive charge which is used to detect the presence of an electric field. Test charge should be as small as possible so that its presence does not affect the electric field due to source charge. The electric charge which produces the electric field is called a source charge.
The electric field strength (E) can be detected through the help of a test charge(q).
E = F/ q
where, E = electric field strength,
F = force applied,
q = charge
Therefore, the correct option is A.
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a 7.3kg gallon paint can is lifted 1.78 meters vertically to a shelf. what is the change potential energy of the paint can
Answer:
127.5 J
Explanation:
Potential energy is given as the product of mass of an object, the height moved and acceleration due to gravity. Therefore, PE=mgh
The change in potential energy is given by mg(hf-hi) where hf-hi is change in height got by subtracting initial height from final height. In this case, the initial height is zero while final height is 1.78 m.
Substituting 9.81 m/s2 for g, 7.3 kg for m and h with 1.78 then the change in potential energy will be
7.3*9.81*(1.78-0)=127.47114 J
Rounded off as 127.5 J
A 24.8 cm tall object is placed in
front of a lens, which creates a
-3.09 cm tall image. If the object is
37.5 cm from the lens, what is the
image distance?
Answer:
Image distance, v = 4.67 cm
Explanation:
We have,
Height of the object, h = 24.8 cm
Height of the formed image, h' = -3.09 cm
Object distance, u - -37.5 cm
It is required to find the image distance. Lens formula is :
[tex]\dfrac{1}{v}-\dfrac{1}{u}=\dfrac{1}{f}[/tex]
Using formula of magnification,
[tex]m=\dfrac{v}{u}=\dfrac{h'}{h}[/tex]
v is image distance
[tex]v=\dfrac{uh'}{h}\\\\v=\dfrac{-37.5\times (-3.09)}{24.8}\\\\v=4.67\ cm[/tex]
So, the image distance is 4.67 cm.
Is glucose and oxygen products reactants of cellular respiration
Answer:
Glucose and oxygen are products of photosynthesis.
Explanation:
Energy, carbon dioxide and water are products of cellular respiration. Glucose and oxygen are reactants in cellular respiration. Energy, water and carbon dioxide are reactants of photosynthesis.
Answer: Reactants
Explanation: A cell will need to break glucose to create energy. Oxygen will turn into carbon dioxide, which is what us humans breathe out.
Which type of mirror causes beams of light to spread apart
A) flat mirror
B) concave mirror
C) diverging mirror
D) converging mirror
Answer:
c . diverging mirror
Explanation:
also known as convex mirror which causes the incident rays of light to spread after reflaction.
To increase the brightness of a desk lamp, a student replaces a 60-watt light bulb with a 100-watt bulb. Compared to the 60-watt bulb, the 100-watt bulb has
1.less resistance and draws more current
2.less resistance and draws less current
3.more resistance and draws more current
4.more resistance and draws less current
Answer:
3. more resistance and draws more current
Explanation:
According to a derivation from Ohm's law, the power, P, generated by the bulb is directly proportional to square of the current, I, passing through it. i.e
P ∝ I²
P = I²R -------------------- (i)
Where;
R = constant of proportionality called resistance
From equation (i), it can thus be deduced that the power, P, is also directly proportional to the resistance, R.
Thus;
(i) When power increases, resistance increases
(ii) When power increases, current also increases.
So for the 100-watt bulb, compared to the 60-watt bulb, there will be more resistance and more current will be drawn.
Answer:
Option 1. Less resistance and draws more current
Explanation:
To better understand this concept, let us determine the resistance and current of each bulb assuming a 240V supply.
Recall:
Power = current (I) x voltage (V)
P = IV
Power = square voltage/ resistance
P = V^2 /R
For the 60watt bulb:
Power (P) = 60watts
Voltage = 240V
Current (I) =?
Resistance =?
A. P= IV
60 = I x 240
Divide both side by 240
I = 60/240
I = 0.25A
B. P = V^2 /R
60 = (240)^2 / R
Cross multiply to express in linear form
60 x R = (240)^2
Divide both side by 60
R = (240)^2 / 60
R = 960 ohms
For 100watts bulb:
Power (P) = 100watts
Voltage = 240V
Current (I) =?
Resistance =?
A. P= IV
100 = I x 240
Divide both side by 240
I = 100/240
I = 0.42A
B. P = V^2 /R
100 = (240)^2 / R
Cross multiply to express in linear form
100 x R = (240)^2
Divide both side by 100
R = (240)^2 / 100
R = 576 ohms
Summary:
60watts bulb has a current of 0.25A and a resistance of 960 ohms
100watts bulb has a current of 0.42A and a resistance of 576 ohms.
Comparing the resistance and current of the 60watts and 100watts bulb under the same supply of 240V,
the 100watts bulb has lesser resistance than the 60watts bulb and draws more current than the 60watts bulb.
A moving object slows to a stop because of compression.*
True
False
Answer: false
Explanation: friction makes objects slow down and stop
Which physical trait is most likely to be influenced at least partly by environment?
A) height
B) hair color
C) weight
D) eye color
Answer:
Height, Hair color and Eye color is mostly influenced by genes. Weight on other hand can be influence by gene a little but its mostly on environment such as diet control and other things.
Explanation:
Select the correct answer from each drop-down menu.
The standard wave format for any wave is
wave. When depicting
wave in standard wave
format, the direction of motion must be rotated by 90 degrees. Only one of two waves is shown at a time when placing
wave in standard wave format.
Reset
Next
Answer:
a transverse (sort of a plot of a sine or cosine graph, basically)
b longitudinal
c Electromagnetic (an electric wave and a magnetic wave travelling together at right angles to each other)
Explanation:
Waves are able to cause a disturbance along a medium thereby transferring energy.
What is a wave?The image and the details of the question are missing but I will try to help you the much I can. A wave is defined as a disturbance along a medium which transfers energy.
A wave can be classified as;
Transverse waveLongitudinal waveOr as;
Mechanical waves andElectromagnetic wavesHence, waves are able to cause a disturbance along a medium thereby transferring energy.
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What is the change in the direction of a wave when it passes obliquely from one medium to another called?
A
refraction
B
interference
C
diffraction
D
superposition
Answer:
Refraction?
Explanation:
A rocket for a space shuttle is producing a constant acceleration of 2.15 m/s2 . What is its velocity 94.0 seconds after the rocket begins to fire?
Answer: 202.1 m/s
Explanation:
Given that,
acceleration of rocket (A) = 2.15 m/s2 velocity (V) = ?
Time taken (T) = 94.0 seconds
Since acceleration is the rate of change of velocity per unit time
i.e Acc = velocity / time
Velocity = Acceleration x time
V = (2.15 m/s2 x 94.0 seconds)
V = 202.1 m/s
Thus, the velocity is 202.1 m/s
John pushes forward on a car with a force of 125n while bob pushes backward on the car with a force of 225n. what is the net force on the car
The net force on the car is -100 N, and it acts in the direction of Bob's force. This means the car experiences a net force of 100 N directed backward.
To find the net force on the car, we need to consider the vector sum of the forces applied by John and Bob. Since they are acting in opposite directions, we'll use the following formula:
Net Force = Force_John + Force_Bob
Now, substitute the given values:
Net Force = 125 N + (-225 N)
Net Force = 125 N - 225 N
Net Force = -100 N
The negative sign indicates the direction of the net force, which is in the direction of the greater force (towards Bob, the direction of the 225 N force).
A skydiver has a mass of 140 kg. At what speed will she have a momentum
of 10,000 kg•m/s?
Answer:
71.4 m/s
Explanation:
compass needle normally points toward Earth's magnetic pole, which is near the North Pole. Which best explains why the
eedle moves away from the pole when it comes close to a current-carrying wire?
Current within the wire weakens the magnetic force of the pole.
Magnetism surrounding the wire weakens the magnetic force of the nole
Answer:
compass needle normally points toward Earth's magnetic pole, which is near the North Pole. Which best explains why the
eedle moves away from the pole when it comes close to a current-carrying wire?
Current within the wire weakens the magnetic force of the pole.
Magnetism surrounding the wire weakens the magnetic force of the nole
Explanation:
Answer:
(D)
Explanation:
A compass needle normally points toward Earth’s magnetic pole, which is near the North Pole. Which best explains why the needle moves away from the pole when it comes close to a current-carrying wire?
Current within the wire weakens the magnetic force of the pole.
Magnetism surrounding the wire weakens the magnetic force of the pole.
Current within the wire draws the needle toward the wire.
Magnetism surrounding the wire draws the needle toward the wire.
What is the maximum power consumption of a 3.0 V portable electronic device that draws (max) 270 mA of current?
Answer:
0.81 Watts
Explanation:
P = IV
P = (0.27 A) (3.0 V)
P = 0.81 W
Ammonia gas occupies a volume of 0.450 L at a pressure of 96 kPa. What
volume will it occupy at standard pressure (101.3 kPa)? *
Answer:
0.426 L
Explanation:
Boyles law is expressed as p1v1=p2v2 where
P1 is first pressure, v1 is first volume
P2 is second pressure, v2 is second volume.
Given information
P1=96 kPa, v1=0.45 l
P2=101.3 kpa
Unknown is v2
Making v2 the subject from Boyle's law
[tex]v2=\frac {p1v1}{p2}[/tex]
Substituting the given values then
[tex]v2=\frac {96*0.45}{101.3}=0.4264560710760l\approx 0.426 l[/tex]
Therefore, the volume is approximately 0.426 L
To find the volume of ammonia gas at standard pressure, we applied Boyle's Law and calculated the final volume to be approximately 0.426 liters. Boyle's Law relates the pressure and volume of a gas when temperature and moles remain constant.
To determine the volume that ammonia gas will occupy at standard pressure (101.3 kPa) given its initial volume and pressure, we can use Boyle's Law. Boyle's Law states that the pressure of a gas is inversely proportional to its volume when temperature and the number of moles are held constant. The formula is as follows:
P1V1 = P2V2
Using the values provided, we can rearrange the formula to solve for V2:
V2 = (P1V1) / P2
Substitute the known values:
V2 = (96 kPa * 0.450 L) / 101.3 kPa
V2 ≈ 0.426 L
So, the volume of ammonia gas at standard pressure will be approximately 0.426 liters.
Example Problem:
A sample of ammonia is found to occupy 0.250 L under laboratory conditions of 27 °C and 0.850 atm. Find the volume of this sample at 0 °C and 1.00 atm.
Venus is located between the planets
Saturn and Earth
Mercury and Earth
Earth and Mars
Mars and Saturn
Answer:
venus is located between mercury and earth
Explanation:
Answer:
Mercury and Earth
Explanation:
Answer questions 4 and 5.
Answer:
4. Momentum = mass x velocity
= 920kg x 25m/s = 23000kgms¯¹
5.Dolphin. Momentum of dolphin is 1000kgms¯¹ whereas the momentum of manatee is 700kgms¯¹
These can be found using the formula above.
True or False? When a pot of water is heated on a stove, it will begin to bubble. This is a sign that there was a chemical reaction.
True
false
Answer:
False
Explanation:
Boiling water is not a chemical change it is a Physical change
Hope this helps PLEASE MARK AS BRAINLIEST !!Answer:
false
Explanation:
PLZ HELP
Which statement is true for light passing into a medium that is more optically dense than the first medium through which it passed?
The index of refraction of the second medium is lower.
The index of refraction of the second medium is higher.
The index of reflection of the second medium is lower.
The index of reflection of the second medium is higher.
The statement 'the index of refraction of the second medium is higher' is TRUE for light passing into a second medium that is more optically dense than the first medium.
The refraction index of an object is a measurement that indicates how fast light can travel through this object.The refraction index of a given material/substance can be estimated as the velocity of light of a given wavelength divided by this velocity.The higher the refraction index of an object, the closer to the expected direction the light will travel.In conclusion, the statement 'the index of refraction of the second medium is higher' is TRUE for light passing into a second medium that is more optically dense than the first medium.
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Final answer:
The correct statement is that when light passes into a medium that is more optically dense than the first medium, the index of refraction of the second medium is higher.
Explanation:
When light passes into a medium that is more optically dense than the first medium, the index of refraction of the second medium is higher. This is because a higher index of refraction indicates a more optically dense medium. Consequently, the light ray bends towards the normal -- a line perpendicular to the interface of the two media -- when transitioning from a less optically dense medium to a more optically dense one.
Is this Conduction, Convection, or Radiation:
The top floor of a building is the warmest.
Answer:
convection
Explanation:
hot air rising is a common example of heat convection
Answer: Radiation
Explanation:
Radiation is like for example the sun gives out the radiation from it's heat and for the example you have the heat from the stove is warming the house up from it's radiation waves.
Explain using complete sentences where on the HR diagram you would expect to find a main sequence star based on its physical properties.
Answer:
The Hertzsprung-Russel Diagram also known as HR diagram is stars' scatter plot showing the relation of luminosity or absolute magnitude vs spectral class or surface temperature. The main sequence stars can be plotted on a HR Diagram as a diagonal band as their physical properties vary a lot.
The mass of these stars ranges from about a tenth of that of the Sun to about 200 times the mass of the Sun. Inside these stars Hydrogen fusion results in Helium. 90% of the stars, including the Sun, in the Universe lies in this category.
Their surface temperature lies in the range of 2500 Kelvin to 40000 Kelvin.
And Giant Stars:
A giant star is a star with a radius much larger than that of our Sun (even hundreds of times bigger). They can be either blue giants or red giants: in the first case, the surface temperature is very high, higher than that of the Sun, while in the second case the surface temperature can be lower than that of the Sun. The same applies to the mass: blue giants are very massive stars, burning quickly their nuclear fuel, while red giants can have small masses (a little bit bigger than that of our Sun).
We can find giant stars in the upper part of the HR diagram, blue giants will be on the upper left corner since they have high luminosity and high temperature, while red giants will be on the upper right corner, having high luminosity but low temperature.
Explanation:
When the forces acting on an object are _____, the net force must be zero.
Answer:
According to Newton's first law, when the net force acting on an object is zero, the object must __have a velocity of zero___.
Explanation:
When the net force is zero, the acceleration is zero, so the velocity must be constant. Note that zero velocity is simply a special case of constant velocity.
Hope THIS HELPS
MARK BRAINLIEST!
Answer:
D) positive and negative
Explanation:
How many 75-W lightbulbs, connected to 120 V can be used without blowing a 15-A fuse?
Explanation:
P = IV
n (75 W) = (15 A) (120 V)
n = 24
There could be 24 , 75-W lightbulbs connected to 120 V that can be used without blowing a 15-A fuse.
What is power?The rate of doing work is known as power. The Si unit of power is the watt.
Power consumed by the bulb =work done /time
The mathematical expression for the electric power is as follows,
P = VI
As given in the problems we have to find out how many 75-W lightbulbs, connected to 120 V can be used without blowing a 15-A fuse,
The total power that would blow the fuse = 120 × 15
=1800 watts
Given that a single lightbulb consumes 75 watts,
The number of bulbs = 1800 watts / 75 watts
= 24 lightbulbs
Thus, there would be 24 lightbulbs.
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a person who works in only area of a subject is a
A person who works in only one area of a subject is known as a specialist. This applies to many fields, including world languages, where a person who intensely studies and focuses only on one particular language and its aspects, such as Spanish, could be considered a Spanish language specialist.
Explanation:A person who works in only one area of a subject is often referred to as a specialist. This term can be applied across many fields, but is especially relevant in the field of world languages. For example, a person who intensely studies and focuses only on Spanish language and literature might be considered a Spanish language specialist.
These individuals typically have deep knowledge and understanding of their specialization. This not only includes the language itself, but also its literature, culture, history and other aspects that might not be covered by someone with broad but shallow knowledge. Therefore, if you're looking to learn advanced Spanish for example, seeking help from a Spanish language specialist would be highly beneficial.
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15. Where is chemical energy contained in a compound?
Just search it up on google for the correct answer, not that hard.
Explanation:
Answer:
Chemical energy is stored in the bonds of a compound.
Explanation:
Chemical energy is a type of potential energy and is stored in chemical bonds.
What kind of reaction is it when heat is RELEASED in a chemical reaction, causing temperature to increase?
A)Exothermic Reaction
B)Endothermic Reaction
Answer:
A
Explanation:
EXothermic mean to release heat hit the EX almost like exit