Task 1

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- Read the attachment "Energy and Work Problems" and finish all the 3 paper

- YOU MUST GET ALL THE ANSWERS RIGHT

- Also, provide steps too.

- Please help me with this task

- Please take your time, even more than 1 or 2 hours, but make sure ALL answers are correct, triple check all answers

Task 2

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- Read the attachment "Calculating Efficiency" and finish all the 1 paper

- YOU MUST GET ALL THE ANSWERS RIGHT

- Also, provide steps too.

- Please help me with this task

- Please take your time, even more than 1 or 2 hours, but make sure ALL answers are correct, triple check all answers

ALL ANSWERS MUST BE CORRECT

Energy and Work Problems

Science 10 Energy and Work Probiems 1. While bench pressing, you lift a barbell that weighs 345 N a distance of 35 cm. How much work do you do on the barbell? 2. A forklift exerts a force of 9800 N on a load while lifting it a distance of 0.45 m. The forklift then carries the load, at a constant speed, a distance of 175 m across the warehouse to a truck. (a) How much work does the forklift do on the load while lifting it? (b) How much work does the forklift do on the load while carrying it across the warehouse? (Hint: What is the direction ofthe force that the forklift exerts on the load relative to the direction of the motion?) 3. A crane does 4114i of work while lifting a 1766 N statue onto a pedestal. How high does the crane lift the statue? 4. You do 168 J of work on a 67 N box while carrying it up a flight of stairs. if there are 16 steps in the flight of stairs, how high is each step? 5. Warehouse workers have to slide a large crate a distance of 2.2 m across a floor to make room for the forklift to pick up the crate. If the workers do 2850] of work on the crate while pushing it, what force do they exert on the crate? 6. A pulley system called a block and tackle (shown below} allows a mechanic to lift an engine out of a car by exerting a small force over along distance. (a) if the mechanic exerts a force of 280 N on the chain ofthe block and tackle over a distance of 14 m, how much work does the mechanic do on the chain? (b) Assume that the block and tackle does as much work on the engine as the mechanic does on the chain ofthe block and tackle. If the weight of the engine is 2220 N, how high does the block and tackle lift the engine? 7. Determine the amount of work done by the force represented in each force versus position graph. (a) 4.0 3.0 F (N) 2.0 1.0 2.0 3.0 4.0 5.0 0 7.0 8.0 d( m ) (b) F (N) 2.0 4.0 6.0 10.0 12.0 14.0 16.0 18.0 d(m )Calculating Efficiency 1. A battery charger uses 6585] of electrical energy to charge a battery. If 5420 J of energy is stored in the battery, what is the efficiency of the energy transfer? 2. An electric winch uses 3.78 x 10"] of electrical energy to pull a boat on a boat trailer up a ramp out of a lake. lfthe total mass ofthe boat and trailer is 635 kg, and the winch pulls them a vertical distance of 3.2 m, what is the efficiency of the winch in lifting the boat and trailer? 3. An archer draws her bow and stores 34.8 J of elastic potential energy in the bow. She releases the 63 g arrow, giving it an initial speed of 28 m/s. How efficient is the transfer ofthe elastic potential energy of the bow to the kinetic energy of the arrow? 4. You are having fun on a water slide. You start from the top of the water slide, which is 2.7 m above the surface of the water. If you enter the water with a speed of4.8 m/s, how efficient is the water slide in converting your gravitational potential energy into kinetic energy? Assume that your mass is 58 kg. 5. A farmer is thinking about using a small waterfall on his property to generate hydroelectric energy. He determines that 3155 kg of water fall a distance of 15 rn every minute. Assuming that the process is 74 percent efficient, how much electrical energy could he generate every minute