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Edexcel | Physics WPH0 | W 19 4 1 | 1 hour 30 minutes
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8
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1 Mark

The drum of a washing machine rotates at a rate of 1200 rotations per minute.

What is its angular velocity in radians per second?

A  20

B  63

C  126

D  191

The only correct answer is C because this is calculated using

1200 × 2π /60 s

A is not correct because this is calculated using 1200 / 60 s

B is not correct because this is calculated using 1200 × π / 60 s

D is not correct because this is calculated using 1200 / 2π

8
(b) (II)
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5 Mark s

The diagram shows part of the path of a proton in the linac. Point A and point B

are at the centres of two successive gaps between drift tubes.

                       

The a.c. supply has a frequency of 198 MHz. The average kinetic energy of the

proton as it moves from A to B is 2.0 MeV.

Calculate the distance from A to B. You may assume that the proton speed is

non‑relativistic.

 

                                          Distance = ........................................................

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