A boy on a bicycle rides in a circle of radius 
at speed 
If the boy rides at a radius equal to half the radius 
by what factor must he change his speed in order to have the same centripetal acceleration?
A. 0.25
B. 2
C. 0.71
D. 4
E. 1.4
F. 0.5
C. 0.71
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Determine the Prandtl number for the syrup of problem 4.7. The thermal conductivity for the syrup is 1 W/m?K and the specific heat is 4 kJ/kg?K.
What will be an ideal response?
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Answer the following statement true (T) or false (F)
Where on Earth would you be if Polaris were directly overhead?
A) North Pole B) Arctic Circle C) Tropic of Cancer D) Equator E) It lies overhead everywhere on Earth.
You observe a distant galaxy. You find that a spectral line of hydrogen that is shifted from its normal location in the visible part of the spectrum into the infrared part of the spectrum. What can you conclude?
A) The galaxy is moving away from you. B) The galaxy is moving towards you. C) The galaxy has very weak gravity. D) The galaxy is made purely of hydrogen.