Answer:
A
Explanation:
The closer an object is to light speed, the slower time flows for the object
Answer: Option (B) is the correct answer.
Explanation:
In a solid, molecules are held together by strong intermolecular forces of attraction. As a result, they are unable to move from their initial place but they can vibrate at their mean position.
Hence, in solid substances the molecules have low kinetic energy.
Whereas in liquids, the molecules are held by less strong intermolecular forces of attraction as compared to solids. Due to which they are able to slide past each other. Hence, they have medium kinetic energy.
In gases, the molecules are held by weak Vander waal forces. Hence, they have high kinetic energy due to which they move rapidly from one place to another leading to more number of collisions.
Hence, gases are able to expand more rapidly as compared to liquids.
Thus, we can conclude that out of the given options solid = low; liquid = medium; gas = high, combination of the state of matter and the corresponding dryer speed is correct.
Given that there is not figure with the plane and positions, I assume the data are self-explanatorye.
So,
Position A = sea level = 0 m
Postion B = 0.25 m
Difference in the gravitational potential energy of the ball between positions A and B:
ΔPE = m * g * Δh = 0.7 kg * 9.8 N/kg * 0.25 m = 1.715 N*m = 1.715 J
Answer: 1.715 J
As we know that kinetic energy is given as
Here we can find the initial speed of puck A by momentum conservation
now here we will have initial kinetic energy of the mass is given as
now loss of energy is given as