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Solutions to exam 2 for the general physics i course at st. Vincent college. The exam consists of 4 problems and covers topics such as isolated forces, newton's second law, circular motion, work, and friction. Students are expected to understand concepts related to force, energy, and motion.
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St. Vincent College PH 111: General Physics I
The exam consists of 4 questions. There will be 50 minutes to complete the exam. The questions may not be worth the same number of points, read the entire exam before beginning work. Put your name on all pages.
Problem 1 25
Problem 2 35 Problem 3 10
Problem 4 30
Total 100
a) (5 pts) Is it possible for a single, isolated force to exist? Explain why or why not.
c) (5 pts) When undergoing circular motion, explain why things get “thrown” to the outside of the circle. For example, why do the passengers in an automobile get “thrown” to the right when the driver makes a sharp left turn, or why to the small solid particles suspended in a liquid get “thrown” to the bottom of a test tube in a centrifuge?
d) (5 pts) The units of work are the same as those of energy, yet work is not a form of energy. What us work a measure of?
e) (5 pts) The Earth exerts a gravitational pull on the moon. The moon also exerts a gravitational pull on the Earth. Which of these attractions, if any, has the greater magnitude, and why?
a) (5 pts) Given the vectors
and
, determine the dot product
b) (5 pts) Vector
units. Vector
units. If the dot product
units, what is the angle between
and
? ( Hint: Write down the definition of the dot product and then fill in what is given in the problem.)
a) (10 pts) What is the net work done on the pail?
b) (5 pts) Assuming the bucket starts from rest at the bottom of the well, how fast is the bucket moving when it reaches the top of the well?
c) (10 pts) How long does it take Jill to pull the pail out of the well? ( Hint: Energy methods do not give information relating to time.)
d) (5 pts) At what average rate does Jill do work pulling the pail out of the well? (ie. how much power is Jill expending?)
