energy quiz 2

The formula for gravitational potential energy (GPE) is:

• GPE = mgh

• GPE = 0.5mv^2

• GPE = mv

• GPE = m/T

The equation for calculating work done (W) is:

• W = F/d

• W = F × d

• W = F + d

• W = F - d

The power (P) of a device can be calculated using the equation:

• P = W/t

• P = W × t

• P = W/d

• P = W/t

The formula for electrical energy (E) in terms of power (P) and time (t) is:

• E = Pt

• E = P/t

• E = P × t

• E = P - t

The relationship between kinetic energy (KE) and gravitational potential energy (GPE) in a freely falling object near the Earth's surface is given by:

• KE = GPE

• KE = GPE/2

• KE = GPE + 2

• KE + GPE = 0

The formula for calculating efficiency (η) is:

• η = useful energy output / total energy input

• η = total energy input / useful energy output

• η = useful energy output - total energy input

• η = useful energy output × total energy input

The equation for the efficiency (η) of a device is:

• η = useful energy output / total energy input

• η = total energy input / useful energy output

• η = useful energy output × total energy input

• η = useful energy output - total energy input

A car with a mass of 800 kg is traveling at a speed of 25 m/s. What is its kinetic energy?

• 200 J

• 400 J

• 5000 J

• 1.25×10^5 J

If the velocity of an object is doubled, how does its kinetic energy change?

• It is halved

• It is quartered

• It is doubled

• It remains the same

A cyclist has a kinetic energy of 240 J while moving at a speed of 6 m/s. What is the mass of the cyclist?

• 10 kg

• 20 kg

• 30 kg

• 40 kg