PHYS 6A Lecture 10: phys6a - lecture 10
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13 right os about a b - less than 10, not good. Newton"s 3rd law - if i push on an object a, object applies same force. The fuel combusts - liquid to gas. If there is an opening in the container, the gas is accelerating downwards. Equal and opposite force acts on the propeller and forces the rocket upwards. A traffic light of weight w hangs from two lightweight cables as shown. Each cable hangs at a 45 degrees from the vertical. The angles are the same (45) so the two tensions are the same. Only have to balance things in the y direction. Y comp: w-t1cos(45)(2)=0 (have to multiply by 2 because there are two tensions. A block is at rest on a horizontal tabletop and is not touching anything except the tabletop. The force of friction on the block in this situation has magnitude:
