Homework - 1/11/11

The ski jump has a vertical height of 110 m. If a skier starts at the top from rest, how fast will they be moving at the bottom of the jump?

Homework - 1/10/11

The Pitfall at Kennywood lifts riders to the top of the tower, 76 meters above the ground, and releases them from rest. Using the law of conservation of energy, determine the speed of the riders just before reaching the bottom. (For those of you that have actually been on the Pitfall, you may remember that you actually begin slowing down about two-thirds of the way down. Let's ignore the slowing and just assume that the riders stop at the very bottom.)

Remember: For full credit, you must fill the entire page. Draw a quick diagram of the situation and list the initial and final positions. List the givens, show all of your work, and circle the final answer. Also, explain whether your answers seem reasonable.

Homework - 12/6/10

Two air track gliders collide with each other as shown. Let M = 1 kg. Glider A is moving to the left with an initial speed of 5 m/s and glider B is initially at rest. If the collision between the two is inelastic, calculate the final speed of both gliders.


Remember: For full credit, you must fill the entire page. List the givens, show all of your work, and circle the final answer. Also, explain whether your answers seem reasonable.

Homework - 11/15/10

1. A bullet with a mass of 0.004 kg is fired from a rifle with a speed of 960 m/s. How fast would the average person have to run in order to have the same momentum as the bullet? The average mass of an adult is 70 kg.
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2. Explain one other situation where the bullet and the person have the same momentum.
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Remember: For full credit, you must fill the entire page. List the givens, show all of your work, circle the final answer. Also, explain whether you think a person could actually reach that speed to have the same momentum as the bullet.

Homework - 10/18/10

Three bears each push on a crate full of kittens with 100 N. Kitten lover and long-time bear hater, Mr. Aul steps in to the rescue. Mr. Aul pushes back with 500 N. The crate’s mass is 25 kg. What is the magnitude and direction of the crate's acceleration?

Remember: For full credit, you need to fill the entire page. You must include the free body diagram, show all of your work, and explain if your answer seems reasonable or not. You can explain if the value for acceleration seems reasonable or too high/low. Also, does the direction of the acceleration make sense?

Homework - 10/4/10

Chuck Norris roundhouse kicks a guy off a cliff. The man leaves the cliff horizontally with a velocity of 2.5 m/s. If the cliff is 30 meters high, how far away from the base of the cliff will the man land?

Remember: For full credit, you need to include the diagram, mathematics, and explanation to fill the entire page. For the explanation, remember to explain how you knew which equation to use and whether your answer seems reasonable.

Homework - 9/29/10

A blood-thirsty bear has spotted some innocent campers and decided to attack and maul them. The only thing stopping him is a small creek. The side the bear is jumping from is 2 meters high and he is running with a velocity of 13.5 m/s. If the bear jumps horizontally, how far away will he land from where he jumped? Do you think he'll make it across the creek to kill the campers?

Remember: For full credit, you need to include the diagram, mathematics, and explanation to fill the entire page. For the explanation, remember to explain how you knew which equation to use and whether your answer seems reasonable.