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The energy transformation in a roller coaster ride is between:
A. Potential and kinetic energy
B. Chemical and mechanical energy
C. Thermal and electrical energy
D. Electrical and potential energy
Answer: Potential and kinetic energy
A car moving with a velocity of 15 m/s has a kinetic energy of 2250 J. If the mass of the car is:
A. 150 kg
B. 250 kg
C. 1000 kg
D. 500 kg
Answer: 1000 kg
The work done on an object is equal to:
A. The change in energy of the object
B. The force applied
C. The distance moved
D. The power used
Answer: The change in energy of the object
The SI unit of power is:
A. Watt
B. Joule
C. Newton
D. Pascal
Answer: Watt
The energy of an object in motion is:
A. Kinetic energy
B. Potential energy
C. Thermal energy
D. Chemical energy
Answer: Kinetic energy
The energy stored in a compressed spring is an example of:
A. Elastic potential energy
B. Kinetic energy
C. Gravitational potential energy
D. Thermal energy
Answer: Elastic potential energy
The energy possessed by an object due to its position is called:
A. Potential energy
B. Kinetic energy
C. Mechanical energy
D. Thermal energy
Answer: Potential energy
The power of a machine is defined as:
A. The rate at which work is done
B. The total work done
C. The force applied
D. The distance moved
Answer: The rate at which work is done
In a system where energy is conserved, the total energy before and after a process is:
A. Equal
B. Different
C. Varies
D. Cannot be determined
Answer: Equal