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A $70-\mathrm{kg}$ astronaut floating in space in a 110$\cdot \mathrm{kg}$ MMU (manned maneuvering unit) experiences an acceleration of 0.029 $\mathrm{m} / \mathrm{s}^{2}$ when he fires one of the MMU's thrusters. (a) If the speed of the escaping $\mathrm{N}_{2}$ gas relative to the astronaut is 490 $\mathrm{m} / \mathrm{s}$ , how much gas is used by the thruster in 5.0 $\mathrm{s} ?$ (b) What is the thrust of the thruster?

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(a) The ejected mass is 0.053 $\mathrm{kg}$(b) $F=5.19 \mathrm{N}$

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

Simon Fraser University

University of Sheffield

University of Winnipeg

Lectures

04:30

In classical mechanics, impulse is the integral of a force, F, over the time interval, t, for which it acts. In the case of a constant force, the resulting change in momentum is equal to the force itself, and the impulse is the change in momentum divided by the time during which the force acts. Impulse applied to an object produces an equivalent force to that of the object's mass multiplied by its velocity. In an inertial reference frame, an object that has no net force on it will continue at a constant velocity forever. In classical mechanics, the change in an object's motion, due to a force applied, is called its acceleration. The SI unit of measure for impulse is the newton second.

03:30

In physics, impulse is the integral of a force, F, over the time interval, t, for which it acts. Given a force, F, applied for a time, t, the resulting change in momentum, p, is equal to the impulse, I. Impulse applied to a mass, m, is also equal to the change in the object's kinetic energy, T, as a result of the force acting on it.

04:17

A 70-kg astronaut floating…

03:02

A 70 -kg astronaut floatin…

02:54

A 70 kg astronaut floating…

04:32

02:21

An astronaut at rest in sp…

03:48

A spacecraft engine create…

03:15

An astronaut of mass 210 k…

02:24

An astronaut of mass 210 $…

04:51

mmh An astronaut in his sp…

02:53

An astronaut in his space …

04:05

A large two-stage liquid r…

01:52

A rocket at rest in space,…

04:40

A $140-\mathrm{kg}$ astron…

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