11 mark
A radiator has a power of 2 kilowatts (2 kW).
Convert 2 kW into watts.
0.002 W
200 W
2000 W
2000000 W
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8.1 Physics on the Move
21 mark
The speed of the wind is measured to be 5.555 m/s.
What is 5.555 m/ s written to 2 significant figures?
5.5 m/s
5.55 m/ s
5.56 m/ s
5.6 m/ s
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11 mark
A car travels at a speed of 60 mph (miles per hour).
1 mph = 0.45 m/s.
Convert 60 mph into m/s (metres per second).
0.45 m/s
7.5 m/s
27 m/s
130 m/s
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21 mark
A student is measuring power of different machines. Which two measurements show the same power measured?
10 GW and 1.0 × 1010 W
4.0 kW and 40 × 1010 W
10 mW and 10 × 103 W
10 MW and 1.0 × 106 W
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31 mark
A car travels at a speed of 70 mph (miles per hour).
1 mile is approximately 1600 metres.
Convert 70 mph into m/s (metres per second).
2.6 m/s
31 m/s
112 m/s
160 m/s
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41 mark
Which row in the table shows realistic speeds?
| Speed (m/s) | |||
| Road cyclist | Gale force wind | Sound in air | |
| A | 40 | 12 | 1 000 |
| B | 6 | 24 | 340 |
| C | 20 | 6 | 760 |
| D | 15 | 55 | 250 |
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51 mark
Estimate the typical cruising speed of a jet airliner.
25m/s
250m/s
2500m/s
25000m/s
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61 mark
A student picks up a very hot plate.
What is the shortest time the student can react and drop the plate?
2 milliseconds
0.2 seconds
2 seconds
0.2 minutes
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