Physics 12 Practice Final Exam

 

Gravity and Circular Motion

1. Calculate the net gravitational force on a 100kg satellite halfway between the Earth and Sun.  (Mass of Earth is 6.0 x 10²⁴ kg, Mass of Sun is 2.0 x 10³⁰ kg and Distance from Earth to Sun is 1.5 x 10⁸ km.)
2. Use Kepler's Third Law (not the Newtonian version) and the fact that the Earth orbits the Sun in one year to find the period of the orbit for the satellite in question 1.
3. Consider a conical pendulum (Lab 11) where the string, of length 50cm, makes and angle of 30° to the vertical, the mass of the bob is 500g and the speed of the bob is 2.0m/s. 
1. Draw the free-body diagram for the bob indicating all the forces on the bob.
2. Draw and label (algebraically, or by name) the net force on the bob and the centripetal acceleration of the bob.
3. Describe the velocity vector of the bob in words for the diagram you have drawn.
4. Use trigonometry to come up with an equation for the tension in the string.

 

Work-Energy

4. A dog owner pulls on the dog’s leash with a force of 50N at an angle of 35º to the horizontal in taking the dog 30m on a level walk.  How much work does the owner do?
5. A puck with initial speed of 1.50m/s slides across an ice rink until it comes to rest.  If the coefficient of kinetic friction is 0.100 find how far it travels.
6. A pendulum bob at the end of a 2.0 m string is let go from rest when the string is horizontal.  Find the speed at the lowest point in the arc.

 

Electric Forces and Fields, Charge Transfer and Circuits

7. Consider an electron at the center of the Earth and proton at the surface of the Earth. 
1. What is the gravitational force between the two particles?
2. What is the electrical force between the two particles?
3. What is the electric field at the surface of the Earth due to the electron?
8. A 12 V car battery is connected across 3.0 m of 0.50 mm diameter wire of unknown material.  The battery delivers 15.0 C charge through the wire in 10.0 min. Find the current in the wire over the 10.0 min time span.
9. A 18.0 V battery delivers 0.15 amps current to a resistor.
1. Draw the circuit diagram for the circuit showing the sign of the battery terminals and the direction of the current flow. 
2. Calculate the resistance of the resistor.
3. Draw the circuit you would have used in the lab to find the voltage and current.
10. A hair dryer of power 2000 W is plugged into a 220 V outlet.
1. How much current does it draw?
2. What is its resistance?
3. How much energy does it consume in kW-h after operating for 6 min?

 

Biomechanics

11. Explain in detail two reasons why the science fiction motif whereby a human being is blown up to ten times their size cannot succeed.  (If you prefer, you can consider why they cannot be shrunk to one-tenth their size.)
12. Outline your investigation in biomechanics in a paragraph.

 

Scientific fair, labs and other stuff

13. Using a Science Fair project other than your own, an experiment done this year, or the video “Runaway Universe” explain how the scientific method is used.