Question 1
A meterstick is shot from a meterstick projector at a speed of 0.90 c. How long will it be relative to an observer's frame of reference?
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2.3 m
◦
0.91 m
◦
1.0 m
◦
0.44 m
◦
0.81 m
Question 2
A proton has a total energy of 2.5 × 10−10 J. How fast is it moving? (M = 1.67 × 10−27 kg)
◦
0.90 c
◦
0.80 c
◦
0.70 c
◦
0.60 c
◦
0.40 c