The number of neutrons in a deuteron is ______________
Fill in the blank(s) with correct word
1
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Any compact object with a mass greater than _______________ solar masses must form a black hole
Fill in the blank(s) with correct word
During summer, the northern polar cap of Mars is made of
A) carbon dioxide ice overlaying water ice B) a layer of carbon dioxide ice C) a layer of water ice D) water ice overlaying carbon dioxide ice
A rigid rod of length l rotates about an axis perpendicular to the rod, with one end of the rod fixed to the axis. Which of the following are equal at all points on the rod? I. the angular position II. the angular velocity III. the angular acceleration IV. the centripetal acceleration V. the tangential acceleration
a. I and II b. I, II, and III c. I, II, III and IV d. I, II, III, IV and V e. I, II and IV.
The aurora borealis (northern lights) are caused by
a. sunlight reflecting from polar ice b. emissions from atoms and molecules in the upper atmosphere excited by electrons from the sun c. thunderstorms d. an unknown process