Question

What would happen to the earth if the Sun were suddenly changed to be a black hole without changing its mass?



a. The black hole would quickly suck in the earth.

b. the earth would gradually spiral inwards to destruction.

c. Earth's orbit would not change.

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2.
(Points: 1)
The most important feature of binary stars is that they enable us to determine which stellar property?



a. temperatures

b. pressures

c. compositions

d. masses

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3.
(Points: 1)
You wake up alone in space, twirling a ball on a string, far from any

Answer 1

You wake up alone in space, twirling a ball on a string, far from any planet,
satellite, or massive object. The string breaks. Assuming you would care under such circumstances, what path does the ball take? It moves _____.




1. continuously in the same circle because space is frictionless

2. directly away from you in a straight line from the point where the string broke

3. away from you sideways in a straight line from the point where the string broke

4. in a paraboloid arc, like a baseball on Earth

Answer 2

I think B,A, and 3