What is the mass of the black hole believed to be at the center of the Milky Way? How do we know?
What will be an ideal response?
Studies of the motions of gas and stars close to it are consistent with an attractor of 3 million solar masses residing in a tiny region inside the vast ionized clouds about 10 pc across.
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The weight of a 1-centimer cubed metal cube scaled up by a factor of 10 will be
A) ten times as much. B) a hundred times as much. C) a thousand times as much. D) none of the above
A satellite engine has an exhaust speed of 2.80 × 10^4 m/s and ejects ionized gas at a rate of 2.50 × 10^–6 kg/s. What is the instantaneous thrust of the engine?
a. 8.93 × 10^–11 N b. 7.00 × 10^–2 N c. 5.30 × 10^2 N d. 1.12 × 10^10 N
The electric field shown is produced by a single point charge at the center of the picture
 What force will a negative charge placed at location C feel? a. zero b. a force up and to the left c. a force up and to the right d. a force down and to the left e. a force down and to the rightA beautiful Chicagoan Princess asks her sweetheart to marry her. The sweetheart says she will give her reply when the Moon is full. If the Princess asked when the Moon was at first quarter, how long will she have to wait?
What will be an ideal response?