Physics H131: Problem Set #3

Two-Minute/Short-Answer Problems

Remember to give a good explanation, no longer than two sentences.

• C4T.5: Figure C4.6 might help.
• C5T.2: Use momentum conservation. The most difficult part of this problem is to give an accurate explanation which is short.

Chapter C4 Problems

Remember to always include the correct units with dimensionful numbers! Remember that each component of a vector has the same units as the vector as a whole or as its magnitude.

• C4B.3: Calculating this with brute force is fine, but using symmetries makes things simpler!
• C4S.2: What is a good reference frame? Why do the diameters of the spheres matter?
• C4S.5: Why is it important that the two chunks pass simultaneously? What then is the best orientation for the reference frame? Do we know enough to definitely answer the question posed in the problem? If not, what data is missing that you have to assume?
• C4S.8: Most of the text of this apparently rather lengthy problem is providing background information which does not provide concrete data needed for its solution. In a first step, boil the problem down to a simple mathematical equation, using a picture to guide your thinking. Only then try to answer the questions.
• C4R.1: Draw a picture and choose a reference frame (don't forget to tell me about your choice!). How far can you reach without your center of mass leaving the boat?

Chapter C5 Problems

• C5B.4: If two objects have momenta that are equal in magnitude, what determines the speed of each?