Osmium (the densest metal found on the periodic table) has a mass density, ρo = 22,500 kg/m3 when it's sitting still. If a sample of osmium is moving with enough speed that its kinetic energy is equal to one-quarter its own rest energy, what is its mass density, ρ', as measured by a stationary observer? (Remember ρ' = m' / V' ) Group of answer choices ρ' = (5/4) ρo ρ' = (25/16) ρo ρ' = (9/25) ρo ρ' = ρo ρ' = (3/5) ρo

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.