What is the circular velocity of an object orbiting Earth at a distance of 100,000 km from Earth's ...

What is the circular velocity of an object orbiting Earth at a distance of 100,000 km from Earth's center? Hint: ; G = 6.67 10-11 m3/s2/kg

a. 0.2 m/s
b. 2 m/s
c. 20 m/s
d. 200 m/s
e. 2,000 m/s

Question 2

O stars must be formed in spiral arms because _____.

a. they do not live long enough to move out of the arm
b. the dust clouds they form from are only found there
c. all stars are formed in spiral arms
d. they are only found in spiral arms their gravitational forces takes them to that location
e. they are left behind and found in the region behind the spiral arm

Question 3

What is the escape velocity from the Moon for a lunar landing module sitting on the Moon's surface? Hints: ; The mass of the Moon is 7.2 1022 kg; its radius is 1738 km; G = 6.67 10-11 m3/s2/kg

a. 2.3 m/s
b. 23 m/s
c. 2.3 km/s
d. 11 km/s
e. 23 km/s

Question 4

The following objects are found in a spiral arm of a galaxy. Which is the exception?

a. population II stars
b. OB associations
c. emission nebulae
d. population I stars
e. clouds of gas and dust

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What is the circular velocity of an object orbiting Earth at a distance of 100,000 km from Earth's ...

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