PHYSICS 206a
HOMEWORK #6
SOLUTIONS
1. A car travels at a constant speed around a circular track. The track is
perfectly horizontal. Draw a free-body diagram showing all the
external forces on the car. If the force of static friction between the
cars tires
PHYSICS 206a
HOMEWORK #7
SOLUTIONS
1. A teaspoon of sugar contains 62790 Joules of chemical potential
energy. If a building is 3 meters per floor, how many floors up would
a 75 kg person need to climb to use up the energy in a teaspoon of
sugar? (An ungra
PHYSICS 206a
HOMEWORK #3
SOLUTIONS
1. Two runners, A and B depart from the same starting point. Runner A goes
meters
directly North with a speed, relative to the ground, of 5
while
second
runner B goes directly west with a speed, also relative to the grou
PHYSICS 206a
HOMEWORK #5
SOLUTIONS
Foxtrot by Bill Amend, February 10, 2006
Before beginning with the solution set, I wanted to discuss some flaws in the
approach to problem solving I have seen on the part of students over the years that are
certainly app
PHYSICS 206a
HOMEWORK #2
SOLUTIONS
1. For each of the dimensions below, express at least three different
units which might be used to measure them:
a. Length
b. Time
c. Mass
Again, recall that dimension refers to the type of quantity being measured while
PHYSICS 206a
HOMEWORK #4
SOLUTIONS
1. Starting with Newtons second law, determine the unit of force in the
SI system. Express this in terms of the fundamental units of that
system. This unit is called the Newton and is abbreviated by the
letter N.
v
v
New
Physics 206a
HOMEWORK #8
SOLUTIONS
1. A molecule of carbon monoxide (CO), which consists of one atom of
carbon and one atom of oxygen, is forced to break apart by the addition
of a certain amount of energy. There is a net excess of energy of 3 10 19
joule
Physics 206a
HOMEWORK #9
SOLUTIONS
(Because of the large amount of algebra in Problem #2, this is only a preliminary
solution set. This set contains the solution of Problem #2 for the special case that the two
masses are the samethis is not the situation
PHYSICS 206a
HOMEWORK #11
SOLUTIONS
1. Using Newtons law of gravitation, derive the acceleration due to
gravity experienced by an object of mass m at the surface of the
Earth. Show that this acceleration is independent of the mass of the
object.
Newtons l
PHYSICS 206a
HOMEWORK #14
SOLUTIONS
As of the last class of the semester, you are able to do problems #3-14.
Although we briefly touched on problem #15 in class, we did not spend
enough time on it for you to understand it fully. Likewise, although you can
Physics 206a
HOMEWORK #9
SOLUTIONS
(Because of the large amount of algebra in Problem #2, this is only a preliminary
solution set. This set contains the solution of Problem #2 for the special case that the two
masses are the samethis is not the situation
PHYSICS 206a
HOMEWORK #13
SOLUTIONS
1. What is the period of a pendulum with a bob mass of 1 kg, an initial
angle of 0.1 radian, and a length of 3 meters?
The period of a pendulum, in the small angle approximation, is given by
L
T = 2
. If you get confuse
PHYSICS 206a
HOMEWORK #10
SOLUTIONS
(Problems #11, 12, and 13 have been moved to the next assignment.)
3. Superman wants to stop the Earth from spinning.
a. Assuming a constant angular acceleration, what torque would he
have to exert on it to stop it in o
PHYSICS 206a
HOMEWORK #12
SOLUTIONS
M
A=10 cm2
P=105 Pa
1. A sample of gas has a pressure of 105 Pascals. (By the way: The
atmospheric pressure at sea level is 101,325 Pascals.) If this gas is
held in a cylinder that is capped with a piston with an area o
PHYSICS 206a
HOMEWORK #1
SOLUTIONS
Note: I reiterate some of the things stated on this
assignment: A full presentation of reasoning is essential
to getting credit on problems in this class! I do not
expect your solutions to look like mine. I want them to