In a shear-thinning material, the applied shear stress divided by the viscosity is equal to the shear strain rate to a power that is equal to
(a) 1
(b) A number less than 1
(c) A number more than 1
(d) 2
(b) A number less than 1
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Nuclear Reactions: A proton strikes an oxygen-18 nucleus, producing fluorine-18 and another particle X. What is the other particle X?
A. neutron B. positron C. alpha particle D. electron E. gamma ray
Luminosity has units of energy per time. Apparent brightness has units of energy per time per area. Which of the following expressions correctly states the relationship between luminosity, distance, and apparent brightness (known as the "inverse square law for light")?
A) luminosity = B) apparent brightness = C) apparent brightness = luminosity × 4? × (distance)2 D) distance =
A crate of grapes lifted 10 meters gains 200 J of potential energy. If the same crate is instead lifted 20 meters, its gain in potential energy is
A) half as much. B) the same. C) twice as much. D) four times as much. E) more than four times as much.
A common 5-liter metal can will float in air if it is
A) evacuated of air. B) filled with a very large amount of helium. C) thrown high enough. D) no way, unless the displaced air weighs more than the can and its contents!