Which statement describes a unique characteristic of Saturn?
a. The density is so low it could float on water
b. The core temperature is hotter than the interior of the Sun.
c. The rings are made up of ice from broken up comets
d. The largest planet within the Solar System.
e. The atmosphere is mostly made up of helium and methane.
a
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A tube bank consists of 30 columns of 3 cm diameter tubes, spaced 4.5 cm apart (center to center) in-line both ways. Ethylene glycol at 90ºC is to be cooled to 60ºC after passing over the tube bank at 2 m/s. Estimate the average tube temperature.
What will be an ideal response?
A black hole consists of a large ________ in a small space.
Fill in the blank(s) with the appropriate word(s).
An athlete doing push-ups performs 650 kJ of work and loses 425 kJ of heat. What is the change in the internal (thermal) energy of the athlete?
A) -225 kJ B) -1075 kJ C) 1075 kJ D) 225 kJ E) 276 kJ
In what three ways does flowing water erode a stream channel?
What will be an ideal response?