A student uses an electric winch system to lift a heavy suspended mass.
The student obtains the following data:
- Total electrical energy input to the motor: 45 000 J45\,000\text{ J}45000 J
- Increase in gravitational potential energy store of the suspended mass: 31 500 J31\,500\text{ J}31500 J
a.[2]
Use this data to calculate the efficiency of the winch system.
b.[2]
The winch is operated for 555 minutes to lift the mass. Calculate the electrical power input of the motor. Use the equation: energy transferred=power×time\text{energy transferred} = \text{power} \times \text{time}energy transferred=power×time
c.[6]
Explain how the student uses the equipment shown to obtain the data. In your answer you should:
- Include how any extra equipment is used.
- Explain how the quantities are calculated.