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The power of a device that uses 300 J of energy in 15 seconds is:
A. 20 W
B. 15 W
C. 30 W
D. 10 W
Answer: 20 W
The formula for calculating the work done is:
A. W = F × d
B. W = mgh
C. W = 1/2 mv^2
D. W = P × t
Answer: W = F × d
The work done to lift a 5 kg object to a height of 10 meters is:
A. 500 J
B. 100 J
C. 50 J
D. 10 J
Answer: 500 J
The energy of a car moving at a velocity of 15 m/s and mass 1000 kg is:
A. 112,500 J
B. 75,000 J
C. 37,500 J
D. 15,000 J
Answer: 112,500 J
The power of a machine that performs 1000 J of work in 50 seconds is:
A. 20 W
B. 50 W
C. 100 W
D. 200 W
Answer: 20 W
The energy conversion in a car engine is primarily from:
A. Chemical to mechanical
B. Mechanical to chemical
C. Electrical to chemical
D. Chemical to electrical
Answer: Chemical to mechanical
The energy of a ball at the top of a hill is mainly:
A. Potential energy
B. Kinetic energy
C. Thermal energy
D. Chemical energy
Answer: Potential energy
The formula for work done when a force is applied is:
A. W = F × d
B. W = mgh
C. W = 1/2 mv^2
D. W = P × t
Answer: W = F × d
The energy required to move an object against gravity is converted to:
A. Gravitational potential energy
B. Kinetic energy
C. Thermal energy
D. Mechanical energy
Answer: Gravitational potential energy