6 marksFoundation and Higher
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.
.1Calculate the energy transferred to the lift's gravitational potential store.
[2 marks] .2Calculate the useful power output of the motor.
[2 marks] .3A 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] 5 marksFoundation and Higher
A student wants to find the density of a small irregular stone. They have a balance, a measuring cylinder and water.
.1Describe how the student can find the volume of the stone.
[2 marks] .2The water level rises from 50 cm³ to 70 cm³. The mass of the stone is 52 g.
Calculate the density of the stone.
[2 marks] .3Suggest one reason the student's value for the volume might be inaccurate.
[1 mark] 6 marksFoundation and Higher
A student measures the resistance of a length of wire. The diagram shows the correct circuit.
.1How is the voltmeter connected to the wire R?
[1 mark] .2The voltmeter reads 3.0 V. The ammeter reads 150 mA.
Calculate the resistance of the wire.
[3 marks] .3The student switches the circuit off between readings. Suggest why.
[2 marks] 4 marksFoundation and Higher
Radium-226 decays by emitting an alpha particle:
88226Ra→ZARn+24He.1Determine the mass number A of the radon nucleus.
[1 mark] .2Determine the atomic number Z of the radon nucleus.
[1 mark] .3Strontium-90 decays by beta emission. Describe what happens in the nucleus during beta decay.
[2 marks] 7 marksFoundation and Higher
A current of 0.25 A flows through a 47 Ω resistor.
.1Calculate the power transferred in the resistor.
Give your answer to 2 significant figures.
[3 marks] .2The p.d. across the resistor is 11.75 V. In one minute, 15 C of charge flows through it.
Calculate the energy transferred in one minute.
[2 marks] .3Show that your answers to parts 1 and 2 agree, and explain why.
[2 marks] 