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During a baseball game, a batter approaches the plate. The pitcher hurtles the ball in the direction of the batter at a speed of 85 miles per hour. The batter swings and makes contact with the ball. The kinetic energy of the ball-batter system is increased by 50%. The ball weighs 5oz. and the batter weighs 195lbs. What is the kinetic energy of this system before the collision? What is the momentum of the system in the center of mass frame?
What is the turntable rotation angular velocity
A 115 V fish-tank heater is rated at 120 W, Calculate the current through the heater when it is operating
Suppose a muon produced as a result of cosmic ray colliding with a nucleus in the upper atmosphere has a velocity v = 0.9500c. What distance is this in the muon's frame
A disk of radius R = 9 cm is pulled along a friction less surface with a force of F = 15 N by a string wrapped around the edge. At the instant when d = 28 cm of string has unwound off the disk, what is torque exerted about the center of the disk.
A ten pound car wheel has a moment of inertia of 0.38 kg m2. What is the wheel's rotational kinetic energy
1. how many kg of coal are used to supply 1500 watts to heat a barn for 7 hours? the energy content of coal is 19 x 106
q1. a student stands several meters in front of a smooth reflecting wall holding a board on which a wire is fixed at
Examining your image in a convex mirror whose radius of curvature is 24.8cm , you stand with the tip of your nose 10.2cm from the surface of the mirror. Where is the image of your nose located
the man and the platform together weigh 1200 N. The pulley can be modeled as frictionless. Elucidate how hard the man has to pull on the rope to lift himself steadily upward above the ground.
In the park, several children with a total mass of 240 kg are riding a merry-go-round with a rotational inertia of 1500 Kg*ms2 and a radius of 2,2m. what is the rotational velocity after the children move tot he center, igoring frictional torque
Two long, parallel wires separated by 4.50 cm carry currents in opposite directions. The current in one wire is 1.20 A, and the current in the other is 3.45 A. Is the force attractive or repulsive
The four tires of an automobile are inflated to a gauge pressure of 2.10E+5 Pa. Each tire has an area of 0.0267 m2 in contact with the ground. Find out the weight of the automobile.
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