Term
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 

Definition
A: 2√(gr)
3Fg = Ft(centripital)  Fg
3mg = (mv^2/r)  mg



Term
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 

Definition
A: √(2gr)
3Fg = Ft(centripital) + Fg
3mg = (mv^2/r) + (mg)



Term
A stone is whirled in a vertical circle on a cord. Halfway up the _____ is towards the center of the circle and the ____ is down. 

Definition


Term
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? 

Definition
g downward
The acceleration must be towards the center of the circle. Review Examples in Chapter 5 in Giancoli.



Term
girl attaches a rock to a string, which she then swings counterclockwise 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?
[image] 

Definition


Term
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 of A is _____that of B.


Definition


Term
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 

Definition


Term
The variation of g over the surface of the earth does not depend upon 

Definition
rotation of the Earth.
g=(GM/d^2)
note: no frequency



Term
There are four forces in nature. What are they and which one allows you to close a door by pushing on it? 

Definition
Electric  allows you to push
Gravity
Nuclear
Weak



Term
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 

Definition


Term
Two bodies of equal mass are separated by a distance R. If you double the distance between them the new gravitational force will be 

Definition
one fourth the old force.
Fg = m(GM/d^2)
Fg = m(GM/(2d^2))
Fg = m(GM/4d^2)



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

Definition
four times the old force.
Fg = m(GM/d^2)
Fg = 2m(G2M/d^2)



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

Definition
twice the old force.
Fg = m(GM/d^2) Fg = 2m(GM/d^2) 


Term
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 

Definition
the same as the old force.
Fg = m(GM/d^2)
Fg = 2m(G2M/(2d^2)
Fg = 2m(G2M/4d^2) 


Term
The Earth moves faster in the winter when its closest to the Sun. This is an example of which law.


Definition
Kepler's Second Law
An imaginary line drawn from the center of the sun to the center of the planet will sweep out equal areas in equal intervals of time 


Term
Kepler's Third Law can be used to relate the motions of the moon and _____ 

Definition
space shuttle
compares the orbital period and radius of orbit of a planet to those of other planets. 


Term
If the mass of the Earth was quadrupled and nothing else was changed 

Definition
g would increase by a factor of 4
g = (GM/d^2)
g = (G4M/d^2) 


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

Definition
1/2 that of Earth.
g=(GM/d^2)
g=(G2M/(2d^2)) g=(G2M/4d^2) 


Term
Four equal masses are arranged in a perfect square. The direction of the force on the one in the lower left hand corner 

Definition


Term
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 

Definition
would be half the magnitude of the force from either of the other two masses.



Term
The speed of a satellite in orbit does not depend on 

Definition
its mass.
mg = mv^2/r
g=v^2/r



Term

Definition

