An electric motor in a lift raises the lift through a height of 12 m in 20 s. The mass of the lift is 800 kg.
Gravitational field strength = 9.8 N/kg.
.1
Calculate the energy transferred to the lift's gravitational potential store.
[2 marks]
.2
Calculate the useful power output of the motor.
[2 marks]
.3
A second motor raises the same lift through the same height in 30 s.
Explain why the second motor has a lower power output.
[2 marks]
6 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A student measures the resistance of a length of wire. The diagram shows the correct circuit.
RAV
.1
How is the voltmeter connected to the wire R?
[1 mark]
.2
The voltmeter reads 3.0 V. The ammeter reads 150 mA.
Calculate the resistance of the wire.
[3 marks]
.3
The student switches the circuit off between readings. Suggest why.
[2 marks]
7 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A skydiver of mass 75 kg jumps from a plane.
Gravitational field strength = 9.8 N/kg.
.1
At one moment the air resistance on the skydiver is 285 N. Calculate the acceleration of the skydiver at this moment.
[3 marks]
.2
Explain why the skydiver reaches a terminal velocity.
[4 marks]
6 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A long, straight wire passes vertically through a horizontal card. The current in the wire flows upwards, out of the card towards you as you look down on it. Small plotting compasses are placed on the card around the wire.
.1
Seen from above, which way do the magnetic field lines go round the wire?
[1 mark]
.2
Describe the pattern of the magnetic field lines drawn on the card.
[2 marks]
.3
The current is reversed. Predict what happens to the compass needles.
[1 mark]
.4
The wire is then wound into a long coil (a solenoid). Describe the magnetic field of the solenoid.
[2 marks]
5 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A block of ice is heated at a steady rate. The graph shows how its temperature changes.
