How fast must a meterstick be moving if its length is measured to shrink to 0.571 m?
How fast must a meterstick be moving if its length is measured to shrink to 0.571 m?
How fast must a meter stick be moving if its length is observed to shrink to 0.65 m?
1271 A meterstick is 3 cm wide. At what velocity must the meterstick travel relative to an observer for the observer to find that its length measures the same as its width ? (The stick is moving in a direction parallel to its length.)
A meterstick moving at 0.864c relative to the Earth's surface approaches an observer at rest with respect to the Earth's surface. (a) What is the meterstick's length as measured by the observer? m (b) Qualitatively, how would the answer to part (a) change if the observer started running toward the meterstick?
If a spaceship of proper length 40 m is measured to have a length 30 m, how fast is it moving? 0.50 c 0.81 c 0.75 c 0.66 c 0.43 c
How fast must an object be going if its rest length is 3.4 times as long as its observed length?
A meterstick moves past you at high speed. In your reference frame, you measure that the length of the meterstick is only 1 foot. How fast is the meterstick moving? a) 0.9071c b) 0.9524c c) 0.8660c d) 0.7670c
How fast must a pion be moving on average to travel 30 m before it decays? The average lifetime, at rest, is 2.6×10-8 s.
How fast must an object move before its length appears to be contracted to one-fourth its proper length? (Give your answer in terms of c.)
How fast must a pion be moving on average to travel 34 m before it decays? The average lifetime, at rest, is 2.6×10−8s . Express your answer to two significant figures. v = ____________ c
D. (a) How fast and in what direction must galaxy A be moving if an absorption line found at 500 nm wavelength for a stationary galaxy is shifted to 450 nm for galaxy A? (b) How fast and in what direction is galaxy B moving if it shows the same line shifted to 650 nm?