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Question 1 of 6
1. Question
In an experiment, a student takes measurements and determines the extension of a spring for
different loads. The apparatus is shown in the diagram below.
The table below shows the results.
(a) What are the values of x and y? [2]
(b) Calculate the load that produces an extension of 49 mm. [2]
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(a) x = y =
(b) load = N
Correct 4 / 4 PointsIncorrect / 4 Points -
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Question 2 of 6
2. Question
The metal has a mass of 5.0 kg and a density of 7.5 × 103 kg / m3.
Calculate the volume of the metal.
Give your answer to a suitable number of significant figures. [3]-
Volume = x 10-4 cubic meter
Correct 3 / 3 PointsIncorrect / 3 Points -
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Question 3 of 6
3. Question
The diagram shows one method of measuring the thermal energy needed to melt ice. The ice is
contained in a glass funnel and covered with an insulator.
The heater is switched on and the ice melts.
The specific latent heat of fusion of ice is 3.3 × 105 J / kg.
Calculate the energy needed to melt 5.0 g of ice. [3]-
Energy = J
Correct 3 / 3 PointsIncorrect / 3 Points -
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Question 4 of 6
4. Question
A microwave signal from a transmitter on the Earth’s surface is sent up to a satellite in orbit and is
then immediately transmitted back to Earth.A pulse of microwaves from the transmitter is received back at the transmitter 0.24 s later.
The speed of microwaves is 3.0 × 108 m / s.
Calculate the distance from the transmitter on the Earth to the satellite. [3]-
distance = x 107 m
Correct 3 / 3 PointsIncorrect / 3 Points -
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Question 5 of 6
5. Question
Wind energy is a renewable energy source. A wind turbine and generator convert energy in the
wind to electrical energy in a generator. The figure below shows some wind turbines.
During a 30 minute period, a mass of 4.2 × 107 kg of air enters the turbine with a speed of 15 m / s.
(i) Calculate the kinetic energy of the air that enters the turbine in 30 minutes. [2]
(ii) The electrical power output of the generator connected to the turbine is 8.4 × 105 W. Calculate the electrical energy output from the turbine in 30 minutes. [2]
(iii) Calculate the efficiency of the turbine and generator in converting the kinetic energy of
the air to electrical energy. [2]-
(i) Kinetic energy = 109 J
(ii) Energy output = 109 J
(iii) Efficiency = %
Correct 6 / 6 PointsIncorrect / 6 Points -
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Question 6 of 6
6. Question
A student connects a battery to two resistors. The circuit diagram is shown below
The potential difference (p.d.) across the 40 Ω resistor is 9.6 V.
(i) Calculate the current in the 40 Ω resistor. [2]
(ii) Calculate the electromotive force (e.m.f.) of the battery. [2]
(iii) Calculate the power P produced in the 10 Ω resistor. [2]
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(i) Current = A
(ii) e.m.f = v
(iii) P = W
Correct 6 / 6 PointsIncorrect / 6 Points -
