Atennis ball bouncing on a hard surface compresses and then rebounds. the details of the rebound are specified in tennis regulations. tennis balls, to be acceptable for tournament play, must have a mass of 57.5 { \rm g}. when dropped from a height of 2.5 {\rm m} onto a concrete surface, a ball must rebound to a height of 1.4 {\rm m}. during impact, the ball compresses by approximately 6 {\rm mm}. how fast is the ball moving when it hits the concrete surface? (ignore air resistance.) a. 5, b. 7, c. 25, d. 50m/s? if the ball accelerates uniformly when it hits the floor, what is its approximate acceleration as it comes to rest before rebounding? a. 1000, b. 2000, c. 3000, d. 4000m/s? by what percent does the kinetic energy decrease? when a tennis ball bounces from a racket, the ball loses approximately 30% of its kinetic energy to thermal energy. a ball that hits a racket at a speed of 10m/s will rebound with approximately what speed?
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Physics, 21.06.2019 23:30
Aquarterback pedals 3.3meters southward and then run 5.7meters northward. whats the distance ? and whats the displacement?
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Physics, 22.06.2019 02:50
Steam is generated in a boiler of a cogeneration plant at 10 mpa and 450°c at a steady rate of 5 kg/s. in normal operation, steam expands in a turbine to a pressure of 0.5 mpa and is then routed to the process heater, where it supplies the process heat. steam leaves the process heater as a saturated liquid and is pumped to the boiler pressure. in this mode, no steam passes through a condenser, which operates at 20 kpa. (a) determine the power produced in the turbine and the rate at which process heat is supplied in this mode. (b) determine the power produced in the turbine and the rate of process heat supplied if only 60 percent of the steam is routed to the process heater and the remainder is expanded to the condenser pressure. (3.32 mw; 9.69 mw; 4.25 mw; 5.82 mw)
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Physics, 22.06.2019 06:00
Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?
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Atennis ball bouncing on a hard surface compresses and then rebounds. the details of the rebound are...
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