Question: I need solutions step by step PDF LP2 + .Ill 62% 00:05 FVV101 Physics Workbook: Part B 2. How much work does a supermarket checkout

I need solutions step by step

PDF LP2 + .Ill 62% 00:05 FVV101 Physics Workbook: Part B 2. How much work does a supermarket checkout attendant do on a can of soup he pushes 0.600 m horizontally with a force of 5.00 N? Ans: 3 J 3. How much work is done by the boy pulling his sister 30.0 m in a wagon as shown in Figure 7.35? Assume no friction acts on the wagon. Ans: 1300 J -..130 19 = 30 m OO Figure 7.35 4. (a) Calculate the work done on a 1500 kg elevator car by its cable to lift it 40.0 m at constant speed, assuming friction averages 100 N. (b) What is the work done on the lift by the gravitational force in this process? (c) What is the total work done on the lift? Ans:(a) 5.92x10* J (b) -5.88x10" J 5. A shopper pushes a grocery cart 20.0 m at constant speed on level ground, against a 35.0 N frictional force. He pushes in a direction 25.0" below the horizontal. (a) What is the work done on the cart by friction? (b) What is the work done on the cart by the gravitational force? (c) What is the work done on the cart by the shopper? (d) Find the force the shopper exerts, using energy considerations. (e) What is the total work done on the cart? Ans: (a) -7001 (b) 0J (c) 700J (d) 38.6 N (e) 0J 6. P&E 8. Suppose the ski patrol lowers a rescue sled and victim, having a total mass of 90.0 kg, down a 60.0" slope at constant speed, as shown in Figure 7.36. The coefficient of friction between the sled and the snow is 0.100. (a) How much work is done by friction as the sled moves 30.0 m along the hill? (b) How much work is done by the rope on the sled in this distance? (c) What is the work done by the gravitational force on the sled? (d) What is the total work done? Ans: (a) -1320 / (b) -2.16x10' J (c) 2.29x10'J (d) 0J 60 Figure 7.36 Mechanics Page 4 of 13

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