During the twentieth century, the study of the large-scale structure of the universe evolved from the theoretical to the practical; the field of physical cosmology was made possible and the better ability to observe extremely distant astronomical objects. (A) because of both Einstein's theory of relativity and
(B) by both Einstein's theory of relativity and
(C) by Einstein's theory of relativity and also
(D) because of Einstein's theory of relativity and also
(E) as a result of both Einstein's theory of relativity and

Determine the amount of work done when a crane lifts a 100-n block form 2m above the ground to 6m above the ground

He latent heat of vaporization for ethyl alcohol is 854 j/g. the amount of energy, rounded to the nearest whole number, needed to change 5.20 grams of ethyl alcohol from a liquid to a gas is

The cheetah is considered the fastest running animal in the world. cheetahs can accelerate to a speed of 20.1 m/s in 2.50 s and can continue to accelerate to reach a top speed of 28.1 m/s. assume the acceleration is constant until the top speed is reached and is zero thereafter.1) starting from a crouched position, how long does it take a cheetah to reach its top speed? (express your answer to three significant figures.) s2) how far does it travel in that time? (express your answer to three significant figures.) m3) if a cheetah sees a rabbit 120 m away, how long will it take to reach the rabbit, assuming the rabbit does not move? (express your answer to three significant figures.)