Author Question: A rocket is fired in a gravity-free environment in deep space. The rocket has an initial mass of ... (Read 145 times)

Lisaclaire · **on:** Jul 29, 2018

A rocket is fired in a gravity-free environment in deep space. The rocket has an initial mass of 8000 kg and ejects gas with a velocity of 2000 m/s. How much gas must be ejected in the first second to give the rocket an acceleration of 30.0 m/s2?

A) 120 kg
B) 7.50 kg
C) 15.0 kg
D) 12.0 kg
E) 150 kg

Question 2

Which one of the following is the correct expression for the energy of the photon?

A) E = h/f
B) E = h/c
C) E = hc/
D) E = c/h
E) E = h