A solid disk of radius R rolls down an incline in time T. The center of the disk is removed up to a radius of R/2 . The remaining portion of the disk with its center gone is again rolled down the same incline. The time it takes is:
a. T.
b. more than T.
c. less than T.
d. requires more information than given in the problem to figure out.
B
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This photo shows the famous Crab Nebula. What is it?
A) an expanding cloud of remains from a star that died in a supernova B) a classic example of a planetary nebula C) a star that is right now undergoing a supernova explosion D) a star forming cloud that will eventually give birth to hundreds of stars
A mirror forms an image in
a. a reflecting telescope. b. your eye. c. a and c. d. b and c.
A chimney is constructed of square concrete blocks with a round flue as shown in Figure 2-56. Estimate the heat loss through the cement blocks per meter of chimney if the outer surface temperature is -10ºC and the inner surface temperature is 150ºC.
Which of the following accurately describes osmosis?
A) The more concentrated solution absorbs water from the less concentrated solution. B) The less concentrated solution absorbs water from the more concentrated solution. C) The less concentrated solution gets more dilute. D) The ions migrate from the more concentrated solution to the less concentrated. E) none of the above