34 You are moving at a speed 23 c toward Randy when shines alight toward you. At

Question

34 You are moving at a speed 23 c toward Randy when shines alight toward you. At what speed do you see the light approaching you? A) 113 B 2/3 c C) 43 According to the equation E- mea. an object tams into energy when it reaches the speed of light. 35 A) True B) False 36An unstable particle is moving at a speed of 16 x msrelative to a laboratory. Its lifetime is measured by a stationary observer in the laboratory to be 68 x 10-6s What is the lifetime of the particle as measured in the rest frame of the particle ee 3o 108 mso 37 How fast (in terms of the speed oflight) should a moving clock travel ifitisto be observed by a stationary observer as running at one-half its normal 38) How fast would a rocket ship have to move past Earthtocontract to halfofits proper length as observed by an Earth-based physicist? 390Calculate the speed at which a 0.723kg object hasthe same momentum as a l 30-kg object that is moving 0.515c A)0.734c B) 0,712e C00,98 D) (0.592e 40) What is the momentum ofa proton when it is moving with a speed of 0.60c? wpcosno 67 A) 1.2x10 19 kg m/s x 10 kg mis C) 3.0 x 10 19kg ms 41 when a proton is traveling at 080c, what is the ratio ofits kinetic energy to its rest energy? A) 0.60 B00.67 D) 1.2 E) 1.7 9.11 x 10 31 kg A) 2.6 x 10 BO 8.2 1.1 x 013 43An electron has a speed of 0.783c.Through what potentialdifference would the electron need to be accelerated from rest in order to reach this speed The rest mass energy of an electron is 0.511 Mev. A 310 kV B 260 kV

Explanation / Answer

34) the speed of light is the same to observers in any inertial frame.i.e, option D

35) true

37) t = [del]t / ( [squ]1 - v^2 / c^2)^1/2.

=> 10s / ( [squ]1-.6)^2)^1/2 = 2.5x10^1

39)as you have given the answers in units of 'c' the speed of light, I assume this is a relatvistic momentum equation.

the relativistic momentum is given by

p = mv/(sqrt(1-(v^2/c^2)))

option A 0.734c

Reference https://www.physicsforums.com/threads/moving-clock.4097/

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