Newton, orbits and gravity, physics questions 10
1. Which of these was discovered by Newton?
A. The earth orbits the sun, rather than the reverse
B. The acceleration caused by gravity is 9.8 m/s^2
C. Gravity keeps the planets in their orbits
D. The planets move in elliptical orbits around the sun
2. The force of gravity between any two ordinary objects on the earth is _______
A. Stronger than the force of gravity from the earth
B. Stronger if the objects are more massive
C. Stronger when closer to the earth
D. Always downward
3. What is the magnitude of a gravitational field at a location where an 80 kg astronaut weighs 25 percent what he would weigh on the earth?
A. 3 N/kg
B. 800 N/kg
C. 10 N/kg
D. 7 x 10^-11 N/kg
4. How high does a rocket have to go above the earth’s surface to be subject to a gravitational field from the earth that is 50.0 percent of its value at the earth’s surface?
A. 3,190 km
B. 9,020 km
C. 12,700 km
D. 2,650 km
5. What causes gravitational force in Einstein’s theory of general relativity?
A. The way an object with mass placed on a surface bends the surface
B. Reference frames moving at a constant relative velocity
C The existence of black holes
D. The way mass bends space and time
6. A mass of 2.50 kg is in a gravitational field of 14.0 N/kg. What force acts on the mass?
A. 9.8 N
B. 35.0 N
C. 5.60 N
D. 0.179 N
7. If you plotted vector arrows around a mass to represent gravitational field vectors, describe how the length of the arrows would change as the locations at which they are drawn become closer to the mass that produces the field.
A. The arrows would become longer.
B. The arrows would become shorter.
C. The arrows would remain the same length
D. The arrows would become shorter and reverse their direction at some distance
8. Which of the observations listed is the best evidence supporting Einstein’s conception of gravity?
A. The detection of black holes
B. The revolution of the earth around the sun
C. the rotation of the earth
D. Kepler’s laws
9. What is Kepler’s first law of planetary motion?
A. Planets have elliptical orbits.
B. The period of a planet’s orbit is proportional to its distance from the sun.
C. Planets have circular orbits.
D. The eccentricity of a planet’s orbit is proportional to its distance from the sun.
10. Which of these is correct about the moon’s motion around the earth?
A. There is no gravity acting on the moon because it is in orbit.
B. Centrifugal force acting on the moon balances the force of the earth’s gravity
C. The moon is in free fall
D. The moon exerts no gravitational force on the earth.
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