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## What A Drag?

I drag a mass m=21 kg in a straight line, along a horizontal surface, a distance D=23 m . I drag it at constant speed v=0.90 m.s−1 in a straight line using a horizontal force. The coefficients of...
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## Rubber Band

A rubber band has mass m=0.30 g and a spring constant k=15 N.m−1 . I stretch it by 5.0 cm (which in this case doubles its length). Assume the rubber band behaves as a Hooke's law spring. Assume that,...
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## Rocket Engine

A machine gun fires bullets, each with mass m = 55 , gm=55 g at a speed of u = 450 m.s u=450 m.s −1 . The gun fires 5.05.0 bullets per second. Let's use it as a rocket engine. What thrust does it...
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## Exploding

[#751] Exploding A mass breaks suddenly into two parts, masses MM and mm, with speeds VV and vv respectively and carrying a total kinetic energy KK. If \frac{M}{m} = R = 4.2 m M ​ =R=4.2, what...
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## Rocket Engine

[#752] Rocket engine A machine gun fires bullets, each with mass m = 55 \text{ g}m=55 g at a speed of u = 450 \text{ m.s}^{-1}u=450 m.s −1 . The gun fires 5.05.0 bullets per second. Let's use it as a...

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