1. In the context of circular motion and gravity, what is an orbit? A. A closed

ID: 1873288 • Letter: 1

Question

1. In the context of circular motion and gravity, what is an orbit?

A. A closed elliptical trajectory around a planet or star.

B. A closed circle around an object.

C. An open sphere engulfing celestial objects.

D. A parabola described by a projectile.

E. None of the above.

2. What shape can an orbit take? Select all that apply:

A. Circle

B. Ellipse

C. Square

D. Point

E. None of the above

3. In which cases are you actually weightless? Check all that apply

A. In orbit in the space station

B. In an elevator moving down

C. In a falling elevator

D. In a nose-diving airplane

E. Falling into a black hole

F. None of the above

HINT :Actually weightless = Have no weight (W = m*g = 0)

4. If a satellite orbits the Earth 24 times in a day, what is its period?

A. 0.02 R.P.M.

B. 1 hour

C. 0.0003 Hz

D. None of the above

1. (B) An closed circle around the object.

( this is the circular orbit around the object)

2. (a) circle ,

(B) Ellipse

3. we will feel weightless when we have acceleration equal to the acceleration due to gravity.

Ans: (C) In a falling elevator

4. T = (24 hr) / 24

Time period is the time taken to complete one oscillation(round).

Ans (B) T = 1 hr

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