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In the old west, a marshal riding on a train traveling 50 m/s seesa duel between two men standing on the Earth 50 m apart parallel tothe train. The marshal's instruments indicate that in hisreference frame the two men fired simultaneously.
(a) Which of of the two men, the first one the train passes (A) orthe second one (B) should be arrested for firing the first shot? That is, in the gunfighter's frame of reference, who firedfirst?
(b) How much earlier did he fire?
(c) Who was struck first?
In general, for a concave mirror with a focal length +f, how far should an object be placed from the mirror to form a real image which is neither enlarged nor reduced(enter your answer as a multiple of f)?
An asteroid is moving along a straight line. A force acts along the displacement of the asteroid and slows it down. If the asteroid slows down over a distance of 1.3× 106 m determine the magnitude of the force
A 3.5 g ping-pong ball rubbed against a wool jacket acquires a net positive charge of 1.5muC. Estimate the fraction of the ball's electrons that have been removed
The air inside a bicycle tire pump has 221 joules of work done on it as 60.1 joules of heat is conducted away from it
An osprey’s call is a distinct whistle at 2200 {rm Hz}. An osprey calls while diving at you, to drive you away from her nest. You hear the call at 2300 {rm Hz}. Explain how fast is the osprey approaching?
A sinusoidally varying voltage is represented by V(t) = (75 V)sin(120?t). What are its frequency and peak voltage
A rubber raft of mass 3M floats past a dock at 1 m/sec toward the east. A girl of mass 2M runs down the dock and jumps in the raft with a speed of 2 m/sec in the north direction. Find the final velocity of the raft and girl
A 35 kg child slides down a playground slide from a height 2.0 m above the bottom of the slide. The speed of the child at the bottom is 2.8 m.s^-1. If the length of the slide is 3.2. what is the frictional force between the child and the slide.
An object with total mass mtotal = 16.7 kg is sitting at rest when it explodes into three pieces. What is the magnitude of the final momentum of the system
A crate of mass 14.0 kg is pulled up a rough incline with an initial speed of 1.50 m/s. How much mechanical energy is lost due to friction
Three point charges of 2.0 ? C, 4.0 ? C, and 6.0 ? C form an equilateral triangle with each side 2.9cm Find the electric potential energy of this distribution
A skier of mass 65 kg skis straight down a 11° slope at constant velocity. Find the value of the normal force
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