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Universal Gravitation, Circular Motion, And Energy
Test Description: Review for the topics of Universal Gravitation, Circular Motion, and Energy for General Physics in High School
Instructions: Answer all questions to get your test result.
1) 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
30 N
B
1920 N
C
7.5 N
D
480 N
2) 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
30 N
B
7.5 N
C
480 N
D
1920 N
3) 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
Impossible to tell.
D
Moon C
4) 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 C
B
Moon B
C
Moon A
D
Impossible to tell
5) 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 B
B
Moon C
C
Impossible to tell
D
Moon A
6) 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
Impossible to tell
C
Moon C
D
Moon B
7) 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.
8) 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
9) If you do 1,200 J of work to move a box up 3 meters, how much force did you exert?
A
1,200 N
B
400 N
C
Impossible to tell
D
3,600 N
10) 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
4.2 m/s
C
251 meters
D
60 seconds
11) If you triple the mass of a moving object, how much more/less Kinetic Energy does it have?
A
the same amount
B
three times as much
C
nine times as much
D
a third as much
12) If you triple the speed of a moving object, how much more/less Kinetic Energy does it have?
A
nine times as much
B
a third as much
C
the same amount
D
three times as much
13) 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 * 10^17 kg
B
9.8*10^24 kg
C
5.1*10^24 kg
D
9.8*10^17 kg
14) 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
.5 m/s
B
1 m/s
C
2 m/s
D
.17 m/s
15) 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
4 m/s/s
B
0.03 m/s/s
C
1 m/s/s
D
.25 m/s/s
16) The continued existence of massive numbers of baby seals contribute to the world's global energy problems.
A
False
B
True
17) The total Mechanical Energy in a closed system never changes.
A
False
B
True
18) How much total mechanical energy does a 600 kg plane, flying at 60 m/s 200 m above the ground, have?
A
1,200,000 J
B
18,000 J
C
1,080,000 J
D
2,280,000 J
19) 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
2,280,000 J
C
1,200,000 J
D
1,080,000 J
20) How much gravitational potential energy does a 600 kg plane, flying at 60 m/s 200 m above the ground, have?
A
1,080,000 J
B
2,280,000 J
C
1,200,000 J
D
18,000 J
*select an answer for all questions
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