In being served, a tennis ball is accelerated from rest to a speed of 43.9 m/s. The average power generated during the serve is 2920 w. Assuming that the acceleration of the ball is constant during the serve, find the force acting on the ball. P- Numberi 66.5 Units N

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A particle of mass m moves along the x axis. Its position varies with time according to x = and t is in seconds. Determine the velocity v(t) of the particle as a function of t. Determine the acceleration a(t) of the particle as a function of t. Determine the power P(t) delivered to the particle as a function of t. Determine the work W done on the particle by the net force from t = 0 tot = t₁ in terms of defined variables and numerical constants. v(t) = a(t): = P(t) = W = 6t³ - 6t2, where x is in meters

2 W S X In a hydroelectric dam, water falls 35 m and then spins a turbine to generate electricity. 3 E D 80 C $ 4 R 888 F V 96 5 T G ^ 6 B ▾ Part A What is AU of 1.0 kg of water? Express your answer with the appropriate units. View Available Hint(s) AU= -340 J Y Submit ▾ Part B ✓ Correct SOLVE: The change in the potential energy of 1.0 kg of water in falling 35 m m is H Suppose the dam is 80% efficient at converting the water's potential energy to electrical energy. How many kilograms of water must pass through the turbines each second to generate 48 MW of electricity? This is a typical value for a small hydroelectric dam. Express your answer in kilograms per second. ▸ View Available Hint(s) m 11s AU, -mgh=-(1.0 kg) (9.8 m/s²) (35 m) = -340 J = = Provide Feedback Submit MacBook Air Previous Answers & 7 N IG] ΑΣΦ | 3-4 U * 8 D-H I M @ JK ( 9 MOSISO DD O I भ ? O L kg/s command F10 P > ; C option + ? T I Next > delete re