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A tennis ball machine holds 200 balls and has a mass of 36.0 kg when empty. Each tennis ball has a mass of 57.0 g. A coach has set the machine to launch balls horizontally with a speed of 53.0 m/s. He forgot to set the brakes on the machine. If friction between the machine and the court is negligible and all 200 balls are launched, what is the final speed of the machine?
Calculate the magnitude of the current density in the wire. Find out the work done by the hockey player on the puck. What is the change in kinetic energy of the puck.
A banked circular highway curve is designed for traffic moving at 85 km/h. The radius of the curve is 158 m. Traffic is moving along highway at 48 km/h on the rainy day. What is the minimum coefficient of friction between tires and road that would al..
Explosive bolts separate a 840-kg communications satellite from its 560-kg booster rocket. If the impulse of the explosion is 385 N/s, at what relative speed do the satellite and booster separate?
Five clarinets sit a distance of 11.5 m from the audience. Together the intensity level of the music is 78.5 dB, What is the intensity of one clarinet
A horizontal force of magnitude 36.4 N pushes a block of mass3.81 kg across a floor where the coefficient of kinetic friction is0.640. What is the increase in the kineticenergy of the block
a mass-spring system oscillates on a horizontal frictionless surface with an amplitude of 3.56 cm. if the spring
A flywheel having constant angular acceleration requires 4.20 sec to rotate through 164 rad. Determine the angular velocity at the beginning of the 4.20 sec interval
With brakes fully applied, a 1430kg car decelerates from a speed of 74km/hr. What is the work done by the braking force in bringing car to a stop.
a child does 350 J of work while pulling a box from the ground up to his tree house with a rope the tree house is 8.4 m above the ground
A 12.0 resistor, 10.0 mH inductor, and a 50.0 µF capacitor are connected in series to a 55.0 V (rms) source having variable frequency. Find out the energy delivered to the circuit during one period if the operating frequency is twice the resonance..
A 2.50×106 ? resistor and a 2.00 ?F capacitor are connected in series with an ideal battery of 5.00 V. How much energy was provided by the battery
A 100 g ball on a 60 cm long string is swung in a vertical circle whose center is 200 cm above the floor. The string suddenly breaks while it is parallel to the ground and the ball is moving upward. The ball reaches a height 600 cm above the floor..
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