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

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**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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