3rd Q Exam Review Question Preview (ID: 41572)


Gravity. TEACHERS: click here for quick copy question ID numbers.

Which of the following statements is correct?
a) two 25kg masses would have more gravitational force if they were the same distance apart as two 15kg masses
b) Two bodies that were 45kgs would have more gravitational force if they were farther apart than closer
c) two 25kg masses would have less gravitational force if they were the same distance apart as two 15kg masses
d) mass has no effect on gravitational force, only distance does

If the orbital period (yr) is 0.24 and the Radius (AU) is 0.39, what is the planet's T^2/R^3 ratio?
a) 0.61
b) 0.37
c) 1.02
d) 0.97

A 35.0kg probe lands on a planet. The planet's mass is 7.34 x 10^22kg . The distance from the center of the probe to the center of the planet is 2.75 x 10^7m. Find gravitational force (G is 6.67 x 10^-11 n*m^2/kg^2)
a) 0.227N
b) 6230992.7N
c) 3.40 x 10^9N
d) 780N

This law says that a planet's T2/R3 ratio is always close to 1
a) Kepler's 1st law
b) Kepler's 2nd law
c) Kepler's 3rd law
d) Kepler's 4th law

This law says that in orbit planets sweep equal areas in equal amounts of time
a) Kepler's 1st law
b) Kepler's 2nd law
c) Kepler's 3rd law
d) Kepler's 4th law

This law says that the Sun is always the focal point of an orbit. Empty space is the second focus, and planets orbit in an ellipse shape
a) Kepler's 1st law
b) Kepler's 2nd law
c) Kepler's 3rd law
d) Kepler's 4th law

When you measure the distance between two bodies to find gravitational force, you should measure
a) from the closest point on each body
b) from the farthest point on each body
c) from the farthest point on one body to the center of another
d) the distance from the center of the two bodies

Kepler's 2nd law is also known as
a) The law of equal areas
b) The law of ellipses
c) The law of harmonies
d) The law of gravitational force

Why would an astronaut weigh more on the Sun than the Earth?
a) The astronaut has more mass on the Sun
b) The astronaut is closer to the center of the Sun than the Earth
c) The gravitational field strength is stronger on the Sun
d) The astronaut has less mass on the Sun

An 80.0kg space probe lands on Mars. Mars has a mass of 6.42 x 10^23kg. If the distance to the center of Mars to the probe's center is 3.40 x 10^6m, what is the gravitational force? (G=6.67 x 10^-11)
a) 278N
b) 185N
c) 1.01 x 10^9N
d) 296N

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