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A horizontal 5-cm diameter water jet with a velocity of 18 m/s impinges normally upon a vertical plate of mass 1000 kg. The plate rides on a nearly frictionless track and is initially stationary. When the jet strikes the place, the plate begins to move in the direction of the jet. The water always splatters in the place of the retreating plate. Determine (a) the acceleration of the plate when the jet first strikes in (time = 0), (b) the time it takes for the plate to reach a velocity of 9 m/s, and (c) the plate velocity 20 s after the jet first strikes the plate. For simplicity, assume the velocity of the jet is increased as the cart moves such that the impulse force exerted by the water jet on the plate remains constant
Box moves back and forth on a horizontal frictionless surface between two different springs, as shown in the accompanying figure. The box is initially pressed against the stronger spring, compressing it 4.1cm , and then is released from rest
When landing after a spectacular somersault, a 40.0 kg gymnast decelerates by pushing straight down on the mat. Calculate the force she must exert
A delivery truck travels 13 km north, 17 km east, and 29 km south. What is the angle of the final displacement relative to the east
A box is on the back of a truck, the truck is moving at 72.0 km/h along a level road. what is least distance that the truck can stop in without the box sliding
A 5 g bullet has a speed of 220 m/s and embeds itself into a 650 g block. What is the speed of the block after the collision
A material has an index of refraction of 2.050. What is the critical angle for internal reflection inside a block
A 0.35 kg cart traveling at 0.6 m/s to the right collides with a stationary 0.55 kg cart. After the collision the second cart (.55kg) is traveling to the right at 0.32 m/s, What is the speed and direction of the first(.35kg) cart
In bouncing off a racket, a 50 g tennis ball had its velocity changed from 15 m/s in the forward direction to 20 m/s, how long was the ball in contact with the racket
A baseball is popped straight up into the air and has a hang-time of 6.25 s. Determine the height to which the ball rises before it reaches its peak
A stone is tied to a string (length = 0.727 m) and whirled in a circle at the same constant speed in two different ways. Determine the speed of the stone
Two spectators at a soccer game in Montjuic Stadium see, and a moment later hear, the ball being kicked on the playing field. How far is each spectator from the player
A camera has a lens w/ a 52 mm focal length and a sensor array that measures 4.82mm x 3.64 mm, how far away from the animal will you have to stand
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