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- C7 7.) The work that a force does by acting on an object is equal to what? a.) the product of momentum and force (in the direction of motion) b.) the product of force (in the direction of motion) and distance and is negative if the force and motion are in the same direction c.) the product of force and distance without regard to direction d.) the product of force (in the direction of motion) and distance and is positive if the force and motion are in the same direction e.) the product of distance and kinetic energy3 A child of mass 20 kg on a swing hanging from a 3.0m chain is pulled by her uncle until the swing is at an angle of 30 degrees to the vertical. a) How much farther from the ground is the child now, compared to when the swing was hanging straight down? b) Since the child is motionless at he beginning and the end of the process, what can you say about the work done by gravity, and the work done by the puller on the child during the pullback? What is the amount of work her uncle does to pull back the swing? c) If he lets the swing go at this point, what is the child's speed as she passes the lowest point of the swing & the chain is vertical? Ignore the mass of the swing seat & chain.question 8
- 4. Two identical masses are suspended by strings wrapped around identical frictionless pulleys, except that a heavy metal ring has been added to one of the pulleys. The masses are released from rest and allowed to fall to the ground. How does the final kinetic energy of the falling mass compare between the two systems? Clearly explain your line of reasoning using physics concepts and equations. m m5. Two people of the same mass climb the same set of stairs. Person A climbs the stairs in 25 s. Person B climb the stairs in 35 s. a. Which person does the most work? Explain your answer b. Which person produces more power ? Explain your answerACTIVITY 1 Problem Solving Power Rating Power is the rate of doing work. Power depends on the amount of work done in a specific time. It is measure in joules/second or watts which is the SI unit. Horsepower often used in measuring power of machines but is not an SI unit. One horsepower is equivalent to 750 watts. Read, analyze, and solve the following problems using the GUFSA template. Show your complete solution. Round off your final answer to the nearest hundredths. 1. A piano mover pushes a piano with a force of 200 N, moving it 12 m in 15 s. With how much power does the piano mover need to push?
- A baseball hits the catcher’s glove with a horizontal velocity of 55m/s. The mass of the baseball is 0.15kg. The displacement of the ball due to the deformation of the catcher’s glove and the movement of the catcher’s hand is 23cm from the instant the ball makes contact with the glove until it stops. a. How much kinetic energy does the baseball have just before it strikes the glove? b. How much work does the catcher have to do to the ball during the catch and is it positive or negative? c. What is the average impact force exerted by the glove on the baseball? Answer parts a-c. Include units and direction.A 500 kg cart rests atop a hill 30.0 m high on a roller coaster. Its gravitational potential energy is measured relative to the bottom of the hill. The cart then rolls down the hill. Which of these best describes what is happening in this situation? a. the total mechanical energy of the cart is decreasing, the kinetic energy of the cart is increasing, and the gravitational potential energy of the cart is increasing b. the total mechanical energy of the cart is increasing, the kinetic energy of the cart is increasing, and the gravitational potential energy of the cart is increasing c. the total mechanical energy of the cart is increasing, the kinetic energy of the cart is increasing, and the gravitational potential energy of the cart is decreasing d. the total mechanical energy of the cart is increasing, the kinetic energy of the cart is decreasing, and the gravitational potential energy of the cart is increasing e. the total mechanical energy of…Sara used a sling shot to hunt a bird. She stretched the rubber band 5cm when she applied 2 N force. How much elastic potential energy is stored in the sling shot ? A. 0.05 J B. 0.075 J C. 0.45 J D. 0.25 J
- Superman can throw a ball (mass 145 g) 1000 m/s. Suppose Supermanthrows a ball straight up into the air at 1000 m/s. i. What is the initial kinetic energy of the ball? ii. How high would the ball go if the force ofgravity is constant F = −mg? (use conservation of energy and neglect air resistance). iii. How high would the ball go if you use F = − (GMEm/ r2) ? ME = 5.97 × 1024 kg, and assume the ball is thrown from rE = 6.37 × 106 mYou lift your backpack from the ground and moved forward to your car. Which of the following statements is true? A. Work is done on the backpack while lifting it and moving it forward. B. Work is done on the backpack while lifting it and but not when moving it forward. C. No work is done on the backpack while lifting it but work is done on it when moving it forward. D. No work is done on the backpack at all.B8