Intro to Forces + Newton's Laws Video Lessons

Concept

# Problem: A 20,000 kg rocket has a rocket motor that generates 3.0 x 105 N of thrust. (a) What is the rocket's initial upward acceleration? (b) At an altitude of 5000 m the rocket's acceleration has increased to 6.0 m/s2. What mass of fuel has it burned?

###### FREE Expert Solution

Newton's second law:

$\overline{){\mathbf{\Sigma }}{\mathbf{F}}{\mathbf{=}}{\mathbf{m}}{\mathbf{a}}}$

(a)

Weight is directed downward - negative.

Thrust is directed upward - positive.

Acceleration is directed upward - positive.

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###### Problem Details

A 20,000 kg rocket has a rocket motor that generates 3.0 x 105 N of thrust.

(a) What is the rocket's initial upward acceleration?

(b) At an altitude of 5000 m the rocket's acceleration has increased to 6.0 m/s2. What mass of fuel has it burned?