A viscous fluid is flowing through a small tube at a rate of 0.200 
If the pressure difference between one end of the tube and the other is doubled, the length is halved and the radius is also doubled, then what is the rate of flow of the fluid?
A. 9.2 
B. 10.2
C. 12.8
D. 13.4
E. 14.6
C. 12.8
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A small person with a surface area of about 1.0 m2 must (by the Stefan–Boltzmann law) radiate energy at a rate that would require eating 11,000 food calories a day if they are naked in a vacuum in deep space. Which do you think is the most important reason that someone sitting in a normal room requires less than 2000 calories a day?
A. Wearing clothes reduces the radiation loss. B. Wearing clothes reduces heat loss due to convection. C. A person has an emissivity ? much smaller than 1. D. The person absorbs radiation from the room. E. The surrounding air insulates the person. F. Something else (specify).
What is the gravitational force acting on a 59-kg person due to another 59-kg person standing 2.0 m away? We can model each person as a small sphere. (G = 6.67 × 10-11 N ? m2/kg2)
A) 5.8 × 10-8 N B) 8.5 × 103 N C) 1.2 × 10-7 N D) 9.8 × 10-10 N E) 2.0 × 10-9 N
Which is a characteristic of Jovian planets when compared to Terrestrial planets?
a. Jovian planets are much larger than Terrestrial planets b. Jovian planets have rocky surfaces c. Jovian planets have no differentiation like Terrestrial planets d. Jovian planets have moons, unlike the Terrestrial planets e. Jovian planets have warmer atmospheres than Terrestrial planets.
What is the purpose of a "star shade" in efforts to directly detect extrasolar planets?
A) The star shade blocks light from the central star, so planets can be seen. B) The star shade cools the star, so it does not emit so much contaminating light. C) The star shade keeps the telescope cooler, so it does not emit as much infrared light. D) The star shade changes the wavelength of starlight, so it is easier to distinguish from planet light. E) The star shade separates starlight from planet light based on temperature.