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.

a. If glider A collides elastically and has a final speed of 2.5 m/s, how fast is glider B moving?
b. If glider A collides inelastically, what is the final speed of each glider?


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.

-

2. Explain one other situation where the bullet and the person have the same momentum.

-

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

Two blocks are tied together and hung from the ceiling by two strings as shown above. The mass of the upper block is 2 kg and the lower block is 1 kg. Determine the tension in each string.

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.

Homework - 10/14/10

Three bears each push on a 25kg 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. 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.

Homework - 10/4/10

An arrow is fired from a bow with an initial speed of 100 m/s at an angle of 40 degrees.

a. Determine how much time the arrow spends in the air.

b. Determine the maximum height reached by the arrow.

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 projectile is launched from the ground at an angle of 37 degrees with an initial velocity of 50 m/s.

(a) Calculate the total time for the projectile to hit the ground.

(b) How far away will the projectile land from where it was launched?

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 - 9/21/10

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 mug slides off the table horizontally and strikes the ground 1.40 meters from the base of the table. If the tabletop is 0.86 meters high, what velocity did the mug have when it left the table?

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 770 mi/hr.
-
(a) Determine how much time it will take to reach that speed.
-
(b) Determine how far he will fall to reach that speed.
-
(c) If the first man to perform the jump jumped from 100,000 feet and the new guy is going to jump from 120,000 feet, do you think he will set the record? (Use your answer from b to help justify your answer. Also, 1 meter = 3.3 feet)

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. Also, be careful with the units here. Are mi/hr standard units?

Homework - 9/2/10

A wealthy businessman has been reduced to taking the bus to work. The bus driver, assuming that a businessman certainly wouldn't be waiting for a bus, passes up the bus stop, continuing with a constant velocity of 20 m/s. The businessman starts running from rest, but can only accelerate at 1.5 m/s2. How much time will it take the man to catch the bus? Also, how far did he have to run?

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 answer is reasonable. For example, would a human really be able to cover that distance in that amount of time.

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 honors 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)