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Q. A man is riding on a flatcar traveling at a constant speed of 9.10 (the figure ). He wishes to throw a ball through a stationary hoop 4.90 above the height of his hands in such a manner that the ball will move horizontally as it passes through the hoop. He throws the ball with a speed of 10.8 with respect to himself.What must the vertical component of the initial velocity of the ball be?How many seconds after he releases the ball will it pass through the hoop?At what horizontal distance in front of the hoop must he release the ball?When the ball leaves the man's hands, what is the direction of its velocity relative to the frame of reference of the flat car?When the ball leaves the man's hands, what is the direction of its velocity relative to the frame of reference of an observer standing on the ground?
A box is hanging from a chain having a mass of 60 kg. The box has a mass of 78 kg. Find the tension in the top of chain and the bottom of the chain.
Is the collision completely elastic
Calculate the energy density in the electric field. After the collision, the club head travels (in the same direction) at 46 m/s. Find the speed of the golf ball just after impact.
After the first spring compresses a distance of 32.1 cm, the second spring acts with the first to increase the force as additional compression occurs. The car comes to rest 47.0 cm after first contacting the two-spring system. Find the car's initi..
When verticaly falling sand hits a horizontally moving cart, the cart slows. avoid any friction between the cart and the tracks. Give two reason for this, one in terms of a horizontal force acting on the cart, and one terms of momentum conservatio..
An electric field of 7.90 x10^5 V/m is desired between two parallel plates, each of area 41 cm2 and separated by 2.45 mm of air. What charge should be on each plate.
A 75 , 33 long rod hangs vertically on a frictionless, horizontal axle passing by its center. A 12 ball of clay traveling horizontally at 2.6 hits and sticks to the very bottom tip of the rod.
The amount of internal enrgy needed to raise temperature of .25kg of water by .2 degreesCis 209.3J. How fast must a .25kg baseball travel in order for its kinetic energy to equal this internal energy.
Volcanoes on the Earth eject rocks at speeds of up to 160 m/s. Consider a 1260 m high volcano that ejects rocks in all directions. What is the maximum height above sea level reached through rocks.
A simple pendulum in a science museum entry hall is 3.51m long, has a 1.25kg bob at its lower end, and swings with an amplitude of 10.50 degrees. How much time does the pendulum take to swing from its extreme right side to its acute left side.
A blacksmith heats a 1.9 kg iron horseshoe to 480 degree C, then plunges it into a bucket containing 10kg of water at 20 degree C. The specific heat of iron is 447 J/kgK. What is the final temperature.
A flight attendant pulls hero 70 N flight bag a distance of 253 m along a level airport floor at a constant velocity. The force she exerts is 40N at an angle of 52.0 degrees above the horizontal.
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