Download Rosshall Academy Physics Department

Rosshall Academy Physics Department
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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