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A baseball (mass = 140 g) is pitched so that it crosses home plate with a speed of 92.0 mph at an angle of 18.4degree below the horizontal. It is hit directly back up the middle of the field with a speed of 81.0 mph at an angle of 41.3 degree above the horizontal. Find
(a) the impulse delivered to the ball by the bat, and
(b) the magnitude of the average force on the ball, if it was in contact with the ball for 32.0 ms.
A water droplet of radius 2.2×10?2 remains stationary in the air. how many excess electron charges must the water droplet have
Suppose a spacecraft of mass 28000kg is accelerated to 0.25c, How much kinetic energy would it have
Capacitors won't hold a charge indefinitely; as time goes on, charge gradually migrates from the positive to the negative plate. We can model this as a discharge of the capacitor through an internal "leakage resistance." What is the leakage resist..
A 10000 kg empty railroad car moving at 3 m/s collides with a loaded railroad car weighing 196000 N and couples with it. What is the final velocity of the combined railroad cars
What is the electric field strength between the disks. What is the speed of the box at the end of the 5.7-s interval.
Ball 1, with a mass of 140 g and traveling at 12.0 m/s, collides head on with ball 2, which has a mass of 300 g and is initially at rest. What are the final velocities of each ball if the collision is perfectly elastic
a 2.0kg projectile if fired with initial velocity components Vox= 30 m/s and Voy= 40 m/s from a point on the earth's surface. What is the kinetic energy of the projectile
Capacitance and resistance network.
q1. david is driving a steady 21.0 when he passes tina who is sitting in her car at rest. tina begins to accelerate at
Two boats start together and race across a 62-km-wide lake and back. Boat A goes across at 62 km/h and returns at 62 km/h. Boat B goes across at 31 km/h, and its crew, realizing how far behind it is getting, returns at 93 km/h.
johnny throws a shotput at an angle of 45.deg and it travels a horizontal distance of 30. meters. if he releases the
A 15m long rope of m=1.8kg is stretched such that the tension in the rope is 25N. calculate the displacement of a particle in the rope at t=10s, when the wave is at x=0.5m
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