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A boy tosses a football upward. If the football rises a vertical distance of 3.4 m and the boy catches it at the same point he released it, what is the velocity of the ball just before he catches it? (Assume upward is the positive direction.)
a small wooden block with mass 0.900 is suspended from the lower end of a light cord that is 1.76 long. the block is
A transformer for an answering machine takes an acvoltage of amplitude 150 V as its inputand supplies a 7.9 V amplitude to the answering machine. The primary has 400turns.
Two cars traveling in opposite directions collide head on and are brought to rest. estimate the change in entropy of the universe
an elementary particle of mass m completely absorbs a photon after which its mass is 1.01m.a what was the energy of the
A ski jumper takes off at an angle 20 degrees above the horizontal with a speed of 30.0m/s, Calculate the time of flight
The speed of an alpha particle is determined to be3.45×106 m/s. If all of its kinetic energy isacquired by passing through an electric potential, what is the magnitude of that potential?
A plastic straw 20.0 cm long and 3.00 mm in diameter is filled with honey. What mass of honey flows out of the straw in 1.0 s
a 250 kg merry-go-round is a solid disc with a radius of 1m when a 40 kg child sits at the center the angular speed is 6 rev/s
Police investigators, examining the scene of an accident involving two vans, measure 72 meter long skid marks of one of the vans, Find the initial speed of that car assuming a level road
An insulating spring constant of 10 N/M attached to the width at the top of the page is stretched .25m by the magnetic force. The lengths are parallel to the sides of the page. What is the magnetic field?
The brakes are applied to a car traveling on a dry, level highway. A typical value for the magnitude of the car's acceleration is 4.55 m/s2. how long does it take to stop and how far does it travel
A small die is placed 4in from the center of a turntable begins to slide. The turntable is rotating at 45 rev/min. What is the coefficient of static friction between the die and tturntable? Note 2.54cm=1in. Show work
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