Problem Set 3

# Problem Set 3 - Problem Set III Fall 2006 Physics 200a...

This preview shows pages 1–2. Sign up to view the full content.

Problem Set III Fall 2006 Physics 200a Figures at the end R. Shankar Many problems ask for answers in terms of symbols and not numbers. You may need to invoke things like g in the answer even if I did not explicitly deﬁne them. 1. Here is a problem from string theory for those of you seeking challenges. An object of mass m is hanging from two taut strings as shown in the ﬁgure (1). Find an expression for the tensions T 1 and T 2 on the two strings. Give the numerical values when m = 10 kg , a = π/ 6 and b = π/ 3. 2. A block of mass m sits atop a mass M which rests on a frictionless table. The mass M is connected to a spring of force constant k attached to the wall. (i) How far can mass M be pulled so that upon release, the upper mass m does not slip oﬀ? The coeﬃcient of friction between the two masses is μ . (ii) Repeat if μ 0 is the coeﬃcient of friction between M and the table. See Figure (2). 3. A car moving at 70 km/h collides rams into an immobile steel wall. Its front of the is compressed by 0 . 94 m . What average force must a seat belt exert in order to restrain a 75-kg passenger? 4. A 7.2-kg mass is hanging from the ceiling of an elevator by a spring of spring constant

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 4

Problem Set 3 - Problem Set III Fall 2006 Physics 200a...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online