PHYSICS HW 1

PHYSICS HW 1 - velocity does not affect the time it takes...

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Samantha Muller Physics 104 Chapter 1 1) The reason a dolphin can jump above the oceans surface with out gravity stopping it is because gravity is not powerful enough to stop the dolphin’s force going upward, gravity just ensures that what goes up must come down, which is why the dolphin does not stay above the water once it is above the surface. 4) The reason tapping your toothbrush on the sink to dry it off is an effective method is inertia. The toothbrush hits the sink but the water continues to move forward even though brush does not. 12) The sprinter travels that second 100 m in a quicker time than the first 100 m because during the first 100m the sprinter is acceleration because he/she starts from rest, but during the second 100m they are at a constant speed allowing them to finish faster. 15) The 2 balls hit the ground 1 second after they are dropped from different angles because horizontal and vertical motions are independent. The initial horizontal
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Unformatted text preview: velocity does not affect the time it takes the ball to descend from the ground. 18) If he wants to kick the ball so that it stays in the air for as long as possible he should kick it upward at a 45-degree angle. 24) When you kick a soccer ball the force is equal. Both you foot and the ball exert equal amounts of force on each other. 31) A person does more work lifting a grain of rice over its head opposed to an aunt, this is because the distance it greater when a human lifts the rice. 38) When your roller-skating on level pavement you can maintain speed but when you go up a hill your speed decreases because gravity is pulling you down, and the friction is less. 1) Mass- 800kg Acceleration- 4m/s2 Force-x Acceleration=net force/mass 4m/s2=x/800kg x=3200kg/s2= force 6) D=.5m Initial velocity=x 16) Work=force x distance X=...
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This note was uploaded on 02/22/2012 for the course CRJS 100 taught by Professor Stew during the Fall '11 term at Maryland.

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