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This is the Past Paper of General Physics which includes Cause of Object Motion, Force Exerted, Terms of Energy, Object’s Motion, Presence of Gravitational Force, Coefficient of Static Friction, Initial Velocity, Platypus by Gravity etc. Key important points are: Acceleration, Gravity, Coefficient of Static Friction, Kinetic Friction, Horizontal Circle, Free Body Diagram, Constant Speed, Neglect Friction, Components of Acceleration, Kinetic Friction
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St. Vincent College PH 111: General Physics I
The exam consists of 4 questions. The questions may not be worth the same number of points, read the entire exam before beginning work.
Problem 1 20
Problem 2 30 Problem 3 20 Problem 4 30
Total 100
a) (5 pts) An elevator accelerates upward from rest. Which force does more work during the accelera- tion, gravity or the cable pulling the elevator upwards?
b) (5 pts) Briefly explain why the coefficient of static friction is generally larger than the coefficient of kinetic friction. (Just saying that μs > μk is not an explanation!)
c) (5 pts) A test tube containing a fluid is spun in a horizontal circle by a centrifuge. In what direction is the force exerted on the liquid that is in the tube while the centrifuge is running?
d) (5 pts) A crewman pulls a suit case up an inclined ramp into the cargo hold of an airplane. A passenger comments that gravity does no work on the suit case during the travel up the ramp since it is not the force that is causing the suit case to move. Is the passenger correct? Explain.
| F~ | = k
q 1 q 2 r^2
find the work done by this electric force as q 2 is moved directly away from q 1 to final separation distance b, as shown in the figure below.
Hint : Since q 2 is being moved directly away from q 1 , you can take dℓ = dr. Also note that this means the force between the two charges is parallel to the direction of motion.
a
q 1 q 2
b
a) What is the net work done on the elevator during the 3 s acceleration interval?
b) What is the average power during this interval?
c) On the other hand, what is the power subsequently required to keep the elevator moving upward at a constant cruising speed of 1.75 m/s?
