Physics 011
A of PQ#5
Chapter 5: Circular Motion; Gravitation
Practice Questions


1. 

A stone,
of mass m, is attached to a strong string and whirled in a vertical circle of
radius r. At the exact top of the path the tension in the string is 3 times
the stone's weight. The stone's speed at this point is given by 


2. 

A stone,
of mass m, is attached to a strong string and whirled in a vertical circle of
radius r. At the exact bottom of the path the tension in the string is 3
times the stone's weight. The stone's speed at this point is given by The tension and the weight are in opposite directions. Review Example 55 in Giancoli. 


3. 

A stone is
whirled in a vertical circle on a cord. Halfway up 


4. 

A roller
coaster car is on a track that forms a circular loop in the vertical plane.
If the car is to just maintain contact with the track at the top of the loop,
what is the minimum value for its centripetal acceleration at this point? 


5. 

A girl
attaches a rock to a string, which she then swings counter clockwise in a
horizontal circle. The string breaks at point P on the sketch, which shows a
bird'seye view (i.e., as seen from above). What path will the rock follow? Review section 52 of Giancoli. 


6. 

The
following statements refer to manmade, artificial satellites in orbit around
earth. Which is an accurate statement? Review Section 58 in Giancoli. 


7. 

Two
objects are travelling in circular orbits. Object A is travelling at twice
the velocity of object B in a circle with a diameter of twice that of B. The
centripetal acceleration The speed is squared the radius is not. Review Section 52 in Giancoli. 


8. 

A cannon
ball is fired horizontally off a high cliff over a great distance. If air
resistance can be ignored the path it follows is 


9. 

The
variation of g over the surface of the earth does not depend upon The earth is not a sphere. Review Section 57 in Giancoli. 


10. 

There are
four forces in nature. Which one allows you to close a door by pushing on it? Gravity is always attractive. Review Section 510 in Giancoli. 


11. 

A ball of
mass m is moving in a circle with uniform speed on a horizontal surface with
friction at the end of a radial metal rod. The net force is 


12. 

Two bodies
of equal mass are separated by a distance R. If you double the distance
between them the new gravitational force will be The force decreases with distance. Review Section 56 in Giancoli. 


13. 

Two bodies
of equal mass are separated by a distance R. If you double each mass then the
new force will be Remember both masses are increasing. Review Section 56 in Giancoli. 


14. 

Two bodies
of equal mass are separated by a distance R. If you double one mass then the
new force will be 


15. 

Two bodies
of equal mass are separated by a distance R. If you double each mass and
double the distance between them, the new force will be Review Section 56 in Giancoli. 


16. 

The Earth
moves faster in the winter when its closest to the Sun. This is an example of
Review Section 59 in Giancoli. 


17. 

Which of
the following does not belong with the others? The car is accelerating. Review Section 51 in Giancoli. 


18. 

Kepler's
Third Law can be used to relate the motions of the The Moon is a satellite of the Earth. Review Section 59 in Giancoli. 


19. 

If the
mass of the earth was quadrupled and nothing else was changed Review Section 47 in Giancoli. 


20. 

A planet
with twice the mass and twice its radius has a value of g 


21. 

Four equal
masses are arranged in a perfect square. The direction of the force on the
one in the lower left hand corner Gravity is an attractive force. Review Section 56 in Giancoli. 


22. 

Four equal
masses are arranged in a perfect square. The magnitude of the force on the
one in the lower left hand corner due to the one diagonally across from it It would be less than either. Review Section 56 in Giancoli. 


23. 

The speed
of a satellite in orbit does not depend on The force of gravity depends upon this. Review Section 56 in Giancoli. 


24. 

The period
of planet X is .62 Earth years and that of planet Y is 1.9 years. Review Example 516 in Giancoli. 


25. 

Which of
the following does not belong with the others? 