Circular Motion And Gravity Question Preview (ID: 53750)


This Covers Circular Motion And Gravity, Including Universal Gravity. TEACHERS: click here for quick copy question ID numbers.

From the equation F=mv^2/r, calculate the tension in a 2-m length of string that whirls a 1-kg mass at 2 m/s in a horizontal circle.
a) A. 2 N
b) B. 4 N
c) C. 1 N
d) D. 5 N

Why is the middle seating most comfortable in a bus traveling along a bumpy road?
a) The Bus is more comfortable in the middle because it has thicker cushions.
b) The bus will tend to rock around its CG, so the closer you are to the center of the bus, the less motion you will feel.
c) It is more comfortable in the middle because it's balanced over the wheels.
d) The bus tends to rock more in the other sections.

Calculate the force of gravity between a newborn baby (mass =4 kg) and the planet Mars (mass=6.4 x 10^23 kg), when Mars is at its closest to Earth (distance = 8 x 10^10 m).
a) A. F= G m(1)m(2)/r^2=2.7 x 10^-8 N
b) B. F= G m(1)m(2)/r^2=120.2 x 10^2 N
c) C. F= G m(1)m(2)/r^2=1427 x 10^6 N
d) D.F= G m(1)m(2)/r^2= 102.4 x 10^5 N

Describe an ellipse.
a) The sum of a circle.
b) A path is parallel to the surface below.
c) The sum of the distances from each point on a closed curve to the two foci is constant.
d) An oval

Kepler’s second law is the ratio of the squares of the periods of any two planets revolving around the sun is equal to the ratio of the cubes of their average distance from the sun.
a) True
b) False
c)
d)

As a planet moves in its orbit, a line from the sun to the planet sweeps out equal areas in equal times. This is Kepler’s ____ law.
a) First
b) Second
c) Third
d)

In the Olympic hammer-throw event, an athlete throws a 7.3 kg lead ball attached to a 1.2 m cable. The athlete swings the ball in a circle three or four times before letting it go. If the ball attains a speed of 27 m/s, how much tension is there?
a) A. 225 N
b) B. 400 N
c) C. 357 N
d) D. 399 N

Which balancing act in the figure is in stable equilibrium? (See Picture on shared screen))
a) Option 1 the one on the left
b) Option 2 the middle one
c) Option 3 the one on the right
d)

Which balancing act in the figure is in neutral equilibrium? (See Picture on Shared Screen)
a) Option 1 the one on the left
b) Option 2 the middle one
c) Option 3 the one on the right
d)

Which balancing act in the figure is in unstable equilibrium? (See Picture on Shared Screen)
a) Option 1 the one on the left
b) Option 2 the middle one
c) Option 3 the one on the right
d)

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