1)The earth makes a gravitational force on the moon, and the moon makes a gravitational force on the earth. Which of these forces is larger?
a)The gravitational force of the earth on the moon is greater.
b)The gravitational force of the moon on the earth is greater.
c)The two forces are equal.
d)There is no way to tell.
Answer: A
2) Suppose you could climb a ladder whose height is equal to the radius of the earth. At the top of this ladder
a) your weight would be the same as it is at the surface of the earth.
b)your weight would be ½ its value at the surface of the earth.
c)your weight would be ¼ its value at the surface of the earth.
d) you would be weightless.
Answer: C
3) The moon has potential energy because it is near the earth. If it were twice as far from the earth as it is now,
a) its potential energy would be higher than it is now.
b) is potential energy would be less than it is now.
c) its potential energy would be the same as it is now.
Answer: B
4) Suppose a satellite has a circular orbit around the earth. Why does it stay in orbit?
a)Because gravity does not act on it in the vacuum of space.
b)Because it is in equilibrium; the inward pull of gravity is balanced by an outward force.
c) Because as it moves tangentially, the satellite is accelerated by the force of gravity toward the center of the earth.
Answer: C
5)
Which of the following statements is true?
Planets move in circular orbits, with the Sun in the center of the orbit.
Planets move in circular orbits, with the Sun located off-center.
Planets move in elliptical orbits, with the Sun in the center.
Planets move in elliptical orbits, with the Sun located off-center.
Answer: A, i think but i am not sure..
please help me guys
thanks
thank you for your help
a)The gravitational force of the earth on the moon is greater.
b)The gravitational force of the moon on the earth is greater.
c)The two forces are equal.
d)There is no way to tell.
Answer: A
2) Suppose you could climb a ladder whose height is equal to the radius of the earth. At the top of this ladder
a) your weight would be the same as it is at the surface of the earth.
b)your weight would be ½ its value at the surface of the earth.
c)your weight would be ¼ its value at the surface of the earth.
d) you would be weightless.
Answer: C
3) The moon has potential energy because it is near the earth. If it were twice as far from the earth as it is now,
a) its potential energy would be higher than it is now.
b) is potential energy would be less than it is now.
c) its potential energy would be the same as it is now.
Answer: B
4) Suppose a satellite has a circular orbit around the earth. Why does it stay in orbit?
a)Because gravity does not act on it in the vacuum of space.
b)Because it is in equilibrium; the inward pull of gravity is balanced by an outward force.
c) Because as it moves tangentially, the satellite is accelerated by the force of gravity toward the center of the earth.
Answer: C
5)
Which of the following statements is true?
Planets move in circular orbits, with the Sun in the center of the orbit.
Planets move in circular orbits, with the Sun located off-center.
Planets move in elliptical orbits, with the Sun in the center.
Planets move in elliptical orbits, with the Sun located off-center.
Answer: A, i think but i am not sure..
please help me guys
thanks
thank you for your help