The planet COROT-14b is only slightly larger than Jupiter, but is several times as massive. Which is the most plausible explanation for its similar size to Jupiter?
A) The mass measurement is mistaken, and it is actually about 10 times more massive than Jupiter.
B) Planets that are close to a star are hotter, causing them to puff up.
C) It is made of elements other than hydrogen and helium which do not compress under their own gravity.
D) The hydrogen and helium gas compressed under their own gravity to a higher density than Jupiter.
D) The hydrogen and helium gas compressed under their own gravity to a higher density than Jupiter.
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A 2.0-kg block slides down a fixed, rough curved track. The block has a speed of 5.0 m/s after its height above a horizontal surface has decreased by 1.8 m. Assume the block starts from rest. What is the change in mechanical energy of the block caused by the force of friction during this descent?
A. ?14 J B. ?12 J C. ?10 J D. ?16 J E. ?25 J
The surface tension of soapy water is 0.0250 N/m. What is the height of the water in a capillary tube of diameter 2.00 mm?
A. 5.10 mm B. 4.77 mm C. 4.21 mm D. 3.98 mm E. 3.66 mm
The _____ occurs when some of the energy in the convective motion of gas is converted into magnetic field energy
a. meridional flow b. Maunder minimum c. dynamo effect d. reconnection event e. Zeeman effect
If the north celestial pole appears on your horizon, what is your latitude?
a. 90° N b. 90° S c. 0° d. 45° N e. The latitude of the observer can not be determined from the information given.