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$\bullet$ A $70-\mathrm{kg}$ astronaut floating in space in a $110-\mathrm{kg}$ MMU(manned maneuvering unit) experiences an acceleration of0.029 $\mathrm{m} / \mathrm{s}^{2}$ 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 thethrust of the thruster?

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Physics 101 Mechanics

Chapter 8

Momentum

Physics Basics

Kinetic Energy

Potential Energy

Energy Conservation

Moment, Impulse, and Collisions

Rutgers, The State University of New Jersey

University of Sheffield

University of Winnipeg

Lectures

03:23

In physics, mechanical energy is the sum of the kinetic and potential energies of a system.

04:05

In physics, a conservative force is a force that is path-independent, meaning that the total work done along any path in the field is the same. In other words, the work is independent of the path taken. The only force considered in classical physics to be conservative is gravitation.

04:17

A 70-kg astronaut floating…

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A 70 -kg astronaut floatin…

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A 70 kg astronaut floating…

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02:21

An astronaut at rest in sp…

03:15

An astronaut of mass 210 k…

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mmh An astronaut in his sp…

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Hi, everyone. Here it is, given that has to not having the mask. 70. Katie is in a menu having Gama's 100 Ted Caijing. It is moving with acceleration 0.0 tonight. Meet up per second squared, then astronaut First bun off, sister. Oh. Mm. Union. We have to find mass off nitrogen. Toby used him five seconds. If speed off night, total gas ejected out is full 90 meter per second. It and we're to calculate the trust acting on it. Total mass of the system mass off. Explain it. Plus, master. Mm you. That is 70 and 210. You will get one at T k. G. So I am able peaceful toe be and toe do you have upon duty so d m. You will get em egg. We end. Do and to duty substitute the masses. 1 80. I'm just a speed off nitrogen gas is 4 90. Acceleration is 0.29 time interval is five. So it is. Why did you know 53 kg It exhausted negative means negatives and will be there. It means it is Toby removed from the system so that you should always keep in mind because it is negative means it is existed out from the system. Now we have to calculate the trust. Trust is to find us minus. We can do D m upon deity substitute develop minus 4 90 and tau minus 0.53 on five. So it would be equal toe 5.22 neutrally. Okay, that's all. Thanks for watching it.

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