Gravity
If I double the mass of an object, what happens to the gravitational force?
It doubles
What force causes the centripetal force?
Any that point inward
What provides the centripetal force for the moon as it goes around the earth?
Gravity (between earth and moon)
k
What was the first foreign country I visited?
Netherlands
If I triple the distance between two objects, what happens to the gravitational force?
It triples
I spin a ball at speed V. Then I spin it at the same speed, but on a string that is twice as long. What happens to the centripetal acceleration?
It halfs.
Solve algebraically for the speed a satellite needs to go to orbit the earth at a height of H above the earth's surface.
sqrt(Gm/(R + H)
A 10 cm spring is stretched to 14 cm and generates a force F. If it is instead stretched to 16 cm, what is the new force?
1.5 F
Miranda, Puck, and Tatiana are moons of what planet?
Uranus
What happens to the force between two objects if I half the distance and double both masses?
16x bigger
What is the acceleration of a car rounding a 20 m curve at 10 m/s?
5 m/s2
What is the fastest a car can go over a hill with a curvature of 100 m and not leave the road?
31.6 m/s
What is the radius if the force on a 2kg ball spinning at 5 m/s is 50 N?
1 m
How long does it take Pluto to orbit the sun? (In earth years)
248
Calculate the gravitational force on two objects if the masses are 1000 kg and 40,000 kg and they are 10 m apart.
2.67E-5 N
How fast do I need to go to experience a force of 2000 N around a 3 m curve if I have a mass of 100 kg?
7.74 m/s
If Calisto orbits Jupiter at a distance of 1.88E9 m and at a speed of 8200 m/s, what is Jupiter's mass?
1.9 E 27 kg
Two springs of K1 and K2 are connected in series. What is the combined K of the system?
(1/K + 1/K)^-1
How fast is the speed of light?
3E8 m/s
What is the force on a 100 kg astronaut if he is on a planet of radius 6.5E6 and mass 4E24 kg?
631 N
A fighter pilot experiences 100 m/s2 during a maneuver when he travels at 400 m/s. How fast should he go to experience only 25 m/s2?
200 m/s
You drill a hole into a spherical asteroid while mining. How will the gravitational field 1/3 of the way down compare to the field at the surface?
It will be 2/3 as strong.
How fast is the earth going around the sun? (m/s)
29900 m/s or 29750 m/s depending on method
Who is Ground Control calling?
Major Tom