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.

Homework - 9/27/10

A bear is at a local park, drowning his sorrows the way he knows best - by drinking a mug of honey. Sad that his bear family has deserted him and that his bloodlust for humans has made him a fugitive, he slides the mug down the table in frustration. The tabletop is 0.86 meters high and the mug slides off the table horizontally with a velocity of 3.2 m/s. Find how far away from the base of the table the mug hits the ground.

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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 - 9/20/10

The man trying to set the new world record for fastest falling human is planning to jump from rest and reach a speed of 340 m/s (the speed of sound).
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(a) Determine how much time it will take to reach that speed.
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(b) Determine how far he will fall to reach that speed.

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 - 9/1/10

A sailboat is being constantly accelerated at 3 m/s2. The wind continues to accelerate the boat, causing it to travel 517 meters in 15 seconds. What was the velocity of the boat before the wind started pushing it?

Remember: For full credit, your solution should fill the entire page and should include (1) a diagram, (2) words, and (3) math. In your explanation, you should explain how you knew which equation to use and how you solved for the final answer. You should also state whether your final answer is reasonable or not. For example, a speed of 1,000m/s is not a reasonable speed for a sailboat because they're usually much slower.

Homework 8/30/10

The position versus time graph shown above represents a runner's motion. First, explain, in detail, what the runner's motion looks like and then create a velocity versus time graph that represents the runner. Hint: Since each axis is numerated, you should calculate the slope and use that value to help describe the runner's motion.

Remember: for full credit, you must fill the entire page. Make sure your homework has the three key elements: diagrams, words, and math.

A Classroom of the Future

Welcome to the general physics blog! As technology continues to change our world at an ever-increasing rate, so too should our methods of learning about the world. Blogs and other online learning resources are becoming very common in high school and college classrooms. My hope is that this blog will help make you comfortable with online learning and assignments. You should visit this site often for updates on homework, tests, and other classroom happenings. Good luck!

(Above image from bccue.wikispaces.com)