Author Question: A rocket has an exhaust speed of 2.5 103 m/s, and produces 7.5 105 N of instantaneous thrust. What ... (Read 73 times)

Yolanda · **on:** Jul 28, 2018

A rocket has an exhaust speed of 2.5 103 m/s, and produces 7.5 105 N of instantaneous thrust. What mass of fuel does the rocket burn each second?
a. 3.30 103 kg/s
b. 17.1 kg/s
c. 300 kg/s
d. 1.90 109 kg/s

Question 2

A 2 500-kg car moving north collides with a 2 000-kg car moving west. After the collision, the cars stick together and move at an angle of 45 north of west at a speed of 8.0 m/s. What was the initial speed of the 2 500-kg car?
a. 20 m/s
b. 10.2 m/s
c. 14 m/s
d. 9.3 m/s