# Universal Gravitation, Circular Motion, And Energy Question Preview (ID: 29506)

### Review For The Topics Of Universal Gravitation, Circular Motion, And Energy For General Physics In High School. Answers? Play games to get them!

How much total mechanical energy does a 600 kg plane, flying at 60 m/s 200 m above the ground, have?
a) 18,000 J
b) 1,200,000 J
c) 1,080,000 J
d) 2,280,000 J

The continued existence of massive numbers of baby seals contribute to the world's global energy problems.
a) False
b) True
c)
d)

The total Mechanical Energy in a closed system never changes.
a) True
b) False
c)
d)

An annoying fly is buzzing around your head, flying in perfect circles just outside your arms reach 1 meter away. It completes a trip around your head every 6 seconds. What is the centripetal acceleration of the fly?
a) 0.03 m/s/s
b) .25 m/s/s
c) 1 m/s/s
d) 4 m/s/s

An annoying fly is buzzing around your head, flying in perfect circles just outside your arms reach 1 meter away. It completes a trip around your head every 6 seconds. What is the velocity of the fly?
a) .17 m/s
b) .5 m/s
c) 1 m/s
d) 2 m/s

On an alien planet the acceleration due to gravity is 12.6 m/s/s instead of the 9.8 m/s/s we have on Earth. If the radius of the planet is 5.2*10^6 meters, what is it's mass? (Hint: G = 6.671*10^-11)
a) 5.1*10^24 kg
b) 9.8*10^17 kg
c) 5.1 * 10^17 kg
d) 9.8*10^24 kg

If you triple the speed of a moving object, how much more/less Kinetic Energy does it have?
a) a third as much
b) the same amount
c) three times as much
d) nine times as much

If you triple the mass of a moving object, how much more/less Kinetic Energy does it have?
a) a third as much
b) the same amount
c) three times as much
d) nine times as much

A car travelling around a track with a radius of 40 m completes 5 laps in 5 min. What is the period?
a) 5 min
b) 251 meters
c) 4.2 m/s
d) 60 seconds

If you do 1,200 J of work to move a box up 3 meters, how much force did you exert?
a) 400 N
b) 1,200 N
c) 3,600 N
d) Impossible to tell

A student standing on a platform has 30 kJ of energy before he steps off. If the student has a mass of 90 kg, approximately how far off the ground is he?
a) 0.3 m
b) 3 m
c) 33 m
d) 333 m

A student standing on a platform has 30 kJ of energy before he steps off. How much energy does he have the instant before he lands on the ground?
a) 0 J
b) 30 J
c) 30,000 J
d) Impossible to tell.

3 moons orbit a planet. Moon A orbits at 4000 km, Moon B orbits at 24,000 km, and Moon C orbitsw at 48000 km. The masses of all 3 moons are identical. Which satellite is experiencing the smallest centripetal accelleration?
a) Moon A
b) Moon B
c) Moon C
d) Impossible to tell

3 moons orbit a planet. Moon A orbits at 4000 km, Moon B orbits at 24,000 km, and Moon C orbits at 48000 km. The masses of all 3 moons are identical. Which satellite is experiencing the largest centripetal accelleration?
a) Moon A
b) Moon B
c) Moon C
d) Impossible to tell

3 moons orbit a planet. Moon A orbits at 4000 km, Moon B orbits at 24,000 km, and Moon C orbits at 48000 km. The masses of all 3 moons are identical. Which satellite has the highest orbital speed?
a) Moon A
b) Moon B
c) Moon C
d) Impossible to tell

3 moons orbit a planet. Moon A orbits at 4000 km, Moon B orbits at 24,000 km, and Moon C orbits at 48000 km. The masses of all 3 moons are identical. Which satellite has the lowest orbital speed?
a) Moon A
b) Moon B
c) Moon C
d) Impossible to tell.

Two masses that are 100 m apart attract each other with a force of 120 N. When they are 400 m apart, these masses will attract each other with what force?
a) 7.5 N
b) 30 N
c) 480 N
d) 1920 N

Two masses that are 100 m apart attract each other with a force of 120 N. When they are 25.0 m apart, these masses will attract each other with what force?
a) 7.5 N
b) 30 N
c) 480 N
d) 1920 N

How much Kinetic energy does a 600 kg plane, flying at 60 m/s 200 m above the ground, have?
a) 18,000 J
b) 1,200,000 J
c) 1,080,000 J
d) 2,280,000 J

How much gravitational potential energy does a 600 kg plane, flying at 60 m/s 200 m above the ground, have?
a) 18,000 J
b) 1,200,000 J
c) 1,080,000 J
d) 2,280,000 J

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