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A baseball (m = 145 gram) approaches a bat horizontally at a speed of 39.1 m/s (87 miles per hour) and is hit straight back at a speed of 45.5 m/s (102 mi/h). If the ball is in contact with the bat for a time of 1.00 milliseconds, determine the average force exerted on the ball by the bat? Ignore the weight of the ball, since it is so much less than the force of the bat. Choose the direction of the incoming ball as the positive direction.
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A 85.1 kg astronaut is working on the engines of a spaceship that is drifting through space with a constant velocity. How long does it take the astronaut to reach the ship
A diver shines a flashlight upward from beneath the water at a 43.7 %u2218 angle to the vertical. At what angle does the light leave the water
Calculate the maximum allowable force that can be applied to stop a 1000 kg vehicle if the maximum allowable acceleration is 2.5 g.
a flat mirror and a wall meet at a 45 degree angle. light strikes the mirror 10 meters from the corner at an angle of incidence of 45 degrees
Two 1.60 cm-diameter disks spaced 1.60 mm apart form a parallel-plate capacitor. The electric field between the disks is 5.00×10^5 V/m. How much charge is on each disk
A child pulls a 5kg. toboggan with a 150N force 35 degrees above the horizontal 5m. How much work was done in moving the toboggan
An electron traveling at 697 m/s enters a9.3 T magnetic field. The angle betweenthe velocity and the field is 39o. Find the radius of the resulting circular path
A copper wire has radius r = 0.424 cm, is 6.00 m long, has resistivity ? = 1.72·10-8 ? m, What is the electric field, E, in the wire
A crate is dragged 4.0m along a rough floor with a constant velocity by a worker applying a force of 450N to a rope at an angle of 30? to the horizontal. What is the total work done on the crate
300g of water at 30 c if each gram gains 3.7 calories of heat, what i the final temperature, how much heat gained by the system
An electron is accelerated from rest in a uniform electric field of intensity 420 N/C. Find the following: its velocity and kinetic energy after 3.0 nanoseconds. the distance it travels during the time interval
A 310 turn solenoid with a length of 18.0 cm and a radius of 1.30 cm carries a current of 1.70 A. Calculate the change in the magnetic flux through the 4-turn coil during the same period
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