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Homework problems from chapter 6 and 7 of the giancoli 6th edition textbook. The problems involve calculating the time it takes for an electric motor to lift a piano, converting electric energy units, finding the velocity of a boat after a child throws an object, determining the impulse given to a tennis ball, and calculating the kinetic energy of billiard balls after a collision.
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Phys 135 A Hw 8 Note : These problems are from Giancoli 6th^ Edition Chapter 6 and 7. Chapter 6: 1 - P58- (I) How long will it take a 1750-W motor to lift a 315-kg piano to a sixth-story window 16.0 m above? 2 - P62- (II) Electric energy units are often expressed in the form of “kilowatt-hours.” ( a ) Show that one kilowatt-hour (kWh) is equal to 3.^610 J.
( b ) If a typical family of four uses electric energy at an average rate of 520 W, how many kWh would their electric bill be for one month, and ( c ) how many joules would this be? ( d ) At a cost of $0.12 per kWh, what would their monthly bill be in dollars? Does the monthly bill depend on the rate at which they use the electric energy? Chapter 7: 3 - P 4 - (II) A child in a boat throws a 6.40-kg package out horizontally with a speed of
was initially at rest. The mass of the child is 26.0 kg, and that of the boat is 45.0 kg. Ignore water resistance. 4 - P17-(II) A tennis ball of mass m^ =^0.^060 kg and speed v^ =^25 ms strikes a wall at a 45º angle and rebounds with the same speed at 45º (Fig. 7–32). What is the impulse (magnitude and direction) given to the ball? 5 - P34 (II) An internal explosion breaks an object, initially at rest, into two pieces, one of which has 1.5 times the mass of the other. If 7500 J were released in the explosion, how much kinetic energy did each piece acquire? 6 - A billiard ball with mass 3 kg moves to the right with 4 m/s. It then collides head-on with another billiard ball with mass 1 kg that was moving to the left with 2 m/s. Determine the speed of the balls after the collision.