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# C4 - C4 Particles and Systems M m θ An asteroid of mass M...

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Unformatted text preview: C4: Particles and Systems M m θ An asteroid of mass M is heading right for earth with speed V. A rocket of mass m and speed v is launched at the asteroid in an attempt to deﬂect it from hitting earth. If the rocket becomes embedded in the asteroid after impact, what is the optimum angle to hit the asteroid? a track with very little friction. You throw balls at a partition that is rigidly mounted on the cart. If the balls bounce straight back as shown in the figure, is the cart put in motion? Concept Test 1. are it a cart, initially at rest Suppose you Yes,on moves to the right. on a track with 2. Yes, moves to balls at very little friction.itYou throw the left. a partition that is 3. No, it the cart. If the balls rigidly mounted on remains in place. bounce straight back as shown in the ﬁgure, is the cart put in motion? 1. Yes, it moves to the right. 2. Yes, it moves to the left. 3. No, it remains in place. m M R A hoop of radius R and mass M has a point mass m attached to it. Find the center of mass of the system. L m1 m2 Two space walkers with mass m1 and m2 are holding onto the ends of a rope of length L. They are initially at rest. They begin pulling on the rope. When they come together, how far has each of the astronauts moved? Neglect the mass of the rope. ...
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