P1112 Spring 2009
Homework #6.
This homework will not be graded.
Quiz on HW#6 and HW#7 the first section of the
week of March 9.
Solutions will be posted by
Tuesday Feb. 24. Only Problems 1, 2, and 5 are
relevant for the prelim.
Reading: Chapter 5.4, 12.1, 12.2, 6.1, 6.2
Not all concepts will be covered in class – you are responsible for
all material in the assigned reading and in the homework
problems.
Problems:
1.
Three identical masses of 5.0 kg each are
placed on the xaxis, somewhere in outer
space. One mass is at x = 10 cm, one is at
the origin and one is at x = 40 cm. What is
the net gravitational force (magnitude and
direction) on the mass at the origin, due to
the other two masses? (You can treat the
masses as pointlike particles).
2.
Weight at equator:
Suppose that the Earth is a
perfect sphere. You weigh yourself at the North Pole,
and your scale reads 600 N. You then take the same
scale to the equator and weigh yourself again. What is
the reading of the scale? Choose one and explain,
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This note was uploaded on 02/25/2009 for the course PHYS 1112 taught by Professor Leclair,a during the Fall '07 term at Cornell.
 Fall '07
 LECLAIR,A
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