1) Suppose the Earth\'s orbit about the Sun is circular with an radius of 151200

Question

1) Suppose the Earth's orbit about the Sun is circular with an radius of 151200000000 m. If the Earth takes one year to orbit the Sun, how fast is it traveling in m/s

(the circumference of a circle--the length of the Earth's path over one year--equals 2*PI*r)?

2)The planet's radius is 4000000 m. The planet's period of rotation is 13 hours. How fast (in m/s) would a person standing at the equator be moving because of this rotation? (See Problem 1 for a hint.)

3)If the distance between two objects is doubled, what happens to the force of gravitational attraction between them?
a) It is 1/4 as strong

b) It doubles

c) It is cut in half
d) It stays the same

4)Spring Tides happen during ______ and _______ moons and Neap Tides happen during ________ moons.
a) Gibbous, Crescent, Quarter
b) Full, New, Crescent
c)1st Quarter, 3rd Quarter, New
d) Full, New, Quarter

5)According to Kepler, the path of a planet's orbit is in the shape of :
a) An ellipse, with the earth at one of the foci
b) A circle, with the earth at the center
c) A circle, with the sun at the center
d) An ellipse, with the sun at one of the foci

6)According to Kepler, a planet will travel fastest in its orbit when
a) It is aligned with the other planets
b) It is closest to the sun
c) It is farthest from the sun
d) It is coldest

7) Tides are mostly caused by
a) The orbiting of the Earth around the Sun.
b) The Sun’s pull of gravity on the Earth.
c)The Moon’s pull of gravity on the Earth.
d) The spinning of the Earth.

8) If the Sun, Earth, and Moon are lined up, with Earth in between, the Earth would have
a) Neap Tides, which is when there are almost no tides.
b)Neap Tides, which is when there are very high tides and very low tides.
c)Spring Tides, which is when there are almost no tides.
d) Spring Tides, which is when there are very high tides and very low tides.

Explanation / Answer

1) speed = circumferance / period

    = 2 pi r/ 1 year

   = 2pi×1.512e11/ 365.25*86400

= 4791 m/s

2)v = 2 pi R/T

    = 2pi *4e6/(13×3600)

   = 537 m/s

3) its becomes 1/4 th

4)full,new,quarter

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