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Rosshall Academy Physics Department Name: Term 3 Week 1 Homework General 1. The part of a television receiver which selects the signal from one station is called the A B C D E decoder tuner amplifier modulator aerial. Answer 1 2. What is the colour of the insulation on the wire which should be connected to the live pin of a mains plug? A Blue B Brown C Black D Blue and yellow E Green and yellow Answer 1 3. The mains supply and the car battery are two common sources of electricity. The table below lists the voltage, frequency and type of current for one or other of these sources. Source Mains Car battery Voltage Frequency 12 volts 0 Hz Type of current a.c. Complete the table to fill in the missing details. 3 4. A 12 volt car battery supplies the electrical energy for a car s 60 watt hi-fl system. (i) What is the maximum electrical energy transformed each second in the hi-fi system? …………………………………………………………………………………… (ii) 1 Calculate the current drawn from the battery when the system is operating at full volume. Space for working and answer 2 5. Jack uses 3600 joules of energy running up a hill in 12 seconds. What is the average power developed by Jack? Space for working and answer 2 Credit 1. During the Apollo space programme, an astronaut of mass 80 kg traveled to the Moon. The gravitational field strength did not remain the same throughout the journey. (a) What is meant by gravitational field strength? 1 (b) Complete the last two columns of the table below to show the astronaut’s mass and his weight in different situations. Situation On the Earth At a point on the journey On the Moon Gravitational field strength 10 N/kg Negligible Mass Weight 1.6 N/kg Space for working 3 2. A class has been asked to find the average speed of a toy car as it rolls along the horizontal part XY of a track. Iain’s method and Jill’s method are shown below. Iain starts his stopclock when the car passes the first mark X and stops the clock when the car passes the second mark Y. Jill uses a light-gate placed at X. This is connected to an electric timer which records the time taken for the car to cut the beam. (a) How would Iain find the average speed? 2 (b) The teacher tells Jill that her method does not measure the average speed of the car over the section XY. (i) What speed could be found using Jill’s timing method? 1 (ii) Jill’s method could be changed to allow the measurement of the average speed by adding a second light gate. How could Jill use the two light gates and the timer to find the average speed? 3 General Mark Credit Mark Parent’s signature /10 /10 Grade Grade