Physics Practice: Energy (Mock Test 4 - Expert)
1. In an expert physics experiment, a ball is dropped from height $H$. At what height from the ground will its Kinetic Energy be equal to its Potential Energy?
2. If the mass of a moving object is halved and its velocity is doubled, the new Kinetic Energy will be ________ the original.
3. Why is the efficiency of a real machine (like an electric motor) always less than $100\%$?
4. A person carrying a heavy load on their head and walking on a horizontal road does ________ work in the scientific sense of physics.
5. "Ocean Thermal Energy Conversion" (OTEC) uses the ________ between the surface water and deep water of the ocean.
6. Which of the following defines Power in terms of Force ($F$) and Velocity ($v$)?
7. A bulb marked $60 \text{ W}$ consumes how much energy in $1 \text{ minute}$?
8. Which expert process involves the nuclei of two light atoms combining to release a massive amount of energy (as in the Sun)?
9. $1 \text{ Joule}$ is defined as the work done when a force of $1 \text{ Newton}$ moves a body through a distance of ________ in its own direction.
10. A boy of mass $40 \text{ kg}$ runs up a flight of $30$ steps, each $20 \text{ cm}$ high. If he takes $20 \text{ seconds}$, his power is: (Take $g = 10 \text{ m/s}^2$)
11. The energy possessed by a stretched bow is an example of ________.
12. In an electric generator, ________ energy is converted into ________ energy.
13. Which form of energy is possessed by a flying aeroplane at a height of $2000 \text{ m}$?
14. 1 Watt-second is equal to ________ Joule(s).
15. The expert term for "wasted" energy that cannot be used for work is ________.
16. The fuel used in nuclear power plants to produce energy is ________.
17. A car moving on a horizontal road has only ________ energy.
18. The unit of Power in the CGS system is ________.
19. Which of the following is an example of an expert 'green' energy solution?
20. As an object falls, its velocity increases. This means its ________ is increasing.