Problem 933 A small rocket to gather weather data is launche

Problem 9.33

A small rocket to gather weather data is launched straight up. Several seconds into the flight, its velocity is 120 m/s and it is accelerating at 20 m/s2 . At this instant, the rocket\'s mass is 53 kg and it is losing mass at the rate of 0.50 kg/s as it burns fuel.

Part A

What is the net force on the rocket?
Hint: Newton\'s second law was presented in a new form in this chapter.

Express your answer to two significant figures and include the appropriate units.

Solution

The net (out of balance) force causes the acceleration .. 20 m/s²

Ignoring air resistance ..
Net force = m x a = 53kg x 20m/s² .. .. F = 1060 N