Lect15.pptx.pdf

# Assume fricon can be neglected the fans are set with

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of the cart independent of its mass. Assume fric;on can be neglected. The fans are set with a ;mer so that aFer they are switched on, they stay on for a fixed length of 1me, Δ t , and then are turned off . Just a8er the fans are turned off, which is true about the speed of the two carts? (A) v A > v B (B) v A < v B (C) v A = v B Suppose you are on a cart, initially at rest on a track with negligible friction. You throw balls at a partition that is rigidly mounted on the cart. The balls bounce straight back as shown in the figure. A. Yes. B. No. C. You are not given enough informa;on to decide. Is the total horizontal momentum of the person, cart, par;;on, plus all the balls conserved in the process of throwing the balls and having them bounce off the par;;on? Suppose you are on a cart, initially at rest on a track with negligible friction. You throw balls at a partition that is rigidly mounted on the cart. The balls bounce straight back as shown in the figure. A. Yes. Towards the leF B. Yes. Towards the right. C. No. D. You are not given enough informa;on to decide. Is the cart put in mo;on?
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