A snowboarder starts at the top of an icy hill. Assume the snowboarder has a mass of 73 kg and a starting speed of 20.0 m/s. V = 20.0 m/s Ay = 52 m Drawing not to scale Calculate the snowboarder's mechanical energy at the top of the hill.How much mechanical work does a woman do on a wheelbarrow if she applies a force with a magnitude of 35 N in the forward direction and displaces the wheelbarrow 4.0 m in the same direction? a. 140 J b. 39 I c. 4 J cl. 35 J If a descending parachutist has 8.00 kJ of kinetic energy and 225.00 kJ of mechanical energy, how many kJ of gravitational potential energy does the parachutist have? a. 233 b. 1800 c. 217 d. 28.125About how much power does a sprinter produce if he transforms 2.70 k] of chemical energy from food into kinetic energy and thermal energy in 1I4.0 5'? a. 5.2 W\" be 37.8 W c. 0.2 W (1' 193W How much work is done by a student canying a 12 kg backpack while accelerating at a rate of 0.51 Inn's;2 over a distance of 5.0 111? EL 750 I b. 0 J c. 300 I d. 590 J Calculate the kinetic energy of a 160 g hockey puck mowing with a velocity of 29 mfg. 2L 6? J b. 56 J c. 38 I d. 49 J What is the potential energy of a 69 kg person sitting at the top of a 28 m Penis wheel? a 20 H b. 18 H c. 211d d. l9kJ A compact fluorescent bulb is 25.0 % efficient. How much of 2.20 x 10*kJ of electrical energy will be converted into light? a. 1.65 x 10' kJ b. 5.50 x 10 kJ 1.20 x 102 kJ d. 7.20 x 10 kJA 430 kg motorcycle starts from rest and accelerates to a speed of 12 Ms. Calculate the net work done on the motorcycle. 1 421d 1). 351d c. 311d d. 3815