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Lonnie pitches a baseball of mass .2 kg. The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Lonnie with a return speed of 60 m/s. If the bat is in contact with the ball for .050 s, what is the impulse experienced by the ball.
When two point charges are a distance R apart, their potential energy is -2.00 .How far (in terms of R) should they be from each other so that their potential energy is -6.00.
When a nerve cell depolarizes, charge is transferred across the cell membrane, changing the potential difference. For a typical nerve cell, 9.0 pC of charge flows in a time of 0.50ms . 1. What is the average current? Express your answer to two sig..
A particle with a charge of q = -5.40 nC is moving in a uniform magnetic field of vec{B}=( -1.24 T ) hat{z}. The magnetic force on the particle is measured to be vec{F}= ( -7.60×10-7 N )hat{y}. find v_x, the x component of the speed of the particl..
The puck has a mass of 0.140kg. Its original distance from the center of rotation is 40.0 cm, and it moves with a speed of 70cm/s. The string is pulled downward 15cm by the hole in the frictionless table. Determine the work completed on the puck.
A sanding disk with rotational inertia 8.1 x 10-3 kg·m2 is attached to an electric drill whose motor delivers a torque of magnitude 20N·m about central axis of the disk. About that axis and with torque applied for 29 ms, what is the magnitude of (..
In the physics lab a metal spring is stretched 10cm vertically downward by a 500 g mass attached to it. How much would the similar spring with the same attach mass stretn themon? The mass of the moon is 7.35 x 10 to the 22kg, gravity is 1.62 m/s a..
A student presses a book between his hands, as the drawing indicates. The forces that he exerts on the front and back covers of the book are vertical to the book and are horizontal.
An "energy bar" contains 21g of carbohydrates. If the energy bar was his only fuel, how far could a 68 kg person walk at 5km/hr? Express your answer using two significant figures.
blocks are lined up in a row on a frictionless table. How much force does the 8.0 block exert on the 7 block.
A circular loop in the plane of the screen lies in a 0.60 T magnetic field pointing into the screen. The loop's diameter changes from 18.5 cm to 6.0 cm in 0.50 s.
An aluminum rod is clamped one quarter of the way along its length and set into longitudinal vibration by a variable-frequency driving source. The lowest frequency that produces resonance is 4300 Hz. The speed of sound in an aluminum rod is 5100 m..
An engine goes through the following cycle with 2.20 sample of a diatomic gas. I. an isothermas expansion from point a to point b. II. a constant pressure compression from point b to point c. III.
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