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A sphere of mass m strikes a vertical wall heading to the right and bounces off it now going left. The magnitude of the momentum of the sphere just before impact is pB and just after impact is pA. The sphere is in contact with the wall for time t. The magnitude of the average force exerted by the wall on the sphere is
A. (pB - pA)/t.B. (pB + pA)/t.C. (pB - pA)/mt.D. (pB + pA)/mt.
Suppose that 33.8 percent of the hammer's kinetic energy is used to do the work of sending the metal piece upward. How fast must the hammer be moving when it strikes the target so that the bell just barely rings?
What is the decibel level required for human perception
A car comes to a bridge during a storm and finds the bridge washed out. The driver must get to the other side, What is the speed of the car just before it lands safely on the other side
A boy of mass 50 kg runs up a hill of vertical height 300 m in 20 minutes. calculate the work he does climbing the hill
Two 32.4-cm metal rods, one made of copper and one made of aluminum, are placed end to end, touching each other. How far does the other end of the system of rods move
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question two ocean liners with a mass of 50000 metric tons are 50 m apart. what is the magnitude of the acceleration of
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a high speed train is traveling at a speed of 44.7ms when the engineer sounds the 415hz warning horn. the speed of
A block of mass M = 0.8 kg hangs at the end of a massless spring. What is the new equilibrium extension of the spring
A skater with an initial speed of 7.60 m/s is gliding acrossthe ice. Air resistance is negligible. How far will the skater travel before coming to rest
The two hemispherical pieces are electrically separated from each other but are left close together, so that the distance separating the two halves may be neglected. The upper half is maintained at Phi=Phi0 and the lower half is maintained at phi=..
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