1. Expert Analysis: A ball of mass $m$ is dropped from a height $h$. After bouncing off the floor, it reaches a height of $h/2$. What happened to the "lost" energy?
2. Clinical Logic: Why does a person feel a "jolt" or heat in their muscles after a heavy workout involving eccentric movements (lowering weights)?
3. Data-based: If a machine has an efficiency of 60%, it means for every $100 \text{ J}$ of input energy:
4. Experimental Setup: A simple pendulum is released from position A. At position B (the mean position), its speed is $v$. What is the relationship between height $h$ and velocity $v$?
5. Which of the following describes the energy "degradation" process?
6. A car moving at $10 \text{ m/s}$ is brought to rest by brakes. If the speed was $20 \text{ m/s}$, the stopping distance (assuming constant braking force) would be:
7. In a nuclear fission reaction, the energy is released because:
8. A pump can lift $500 \text{ kg}$ of water to a height of $20 \text{ m}$ in $25 \text{ seconds}$. Calculate its power ($g = 10 \text{ m/s}^2$).
9. Which energy source is based on the "Photovoltaic effect"?
10. For a body moving in a circular path, the work done by the centripetal force is zero because:
11. A $100 \text{ W}$ bulb is used for $10 \text{ hours}$ daily. How many "units" (kWh) of energy does it consume in a day?
12. What is the main disadvantage of "Nuclear Fission" energy?
13. In a thermal power station, the energy of coal is converted into steam energy, which then turns a ________.
14. Kinetic energy can never be:
15. The "Solar Constant" refers to the amount of solar energy received per unit ________ per unit ________.
16. Why is a person carrying a bucket of water walking horizontally on a road doing zero work against gravity?
17. Which of the following is an example of "Tidal" energy harnessing?
18. The energy conversion in an electric heater is:
19. If the velocity of an object is doubled, its Kinetic Energy becomes:
20. S.I. unit of Power is Watt. $1 \text{ kW}$ is equal to:
