Which has the greatest effect on the flow of fluid through a pipe? That is, if you made a 10% change in each of the quantities below, which would cause the greatest change in the flow rate?
A) the fluid viscosity
B) the length of the pipe
C) the pressure difference
D) the radius of the pipe
E) the fluid density
D
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Jupiter gives back into space twice the energy it gets from the distant Sun. Where is this energy coming from, for the most part?
A) the impact energy of comets like SL-9 B) helium rain descending into its mantle and core C) the slow escape of gravitational energy left from its formation D) the radioactive decay of U-238 in its iron-rich core, just as with the Earth E) the combined tidal stress of all four large Galilean moons
If a 10-V battery, with negligible internal resistance, and a 15-? resistor are connected in series, what is the amount of electrical energy transformed to heat per coulomb of charge that flows through the circuit?
a. 0.67 J b. 1.5 J c. 10 J d. 150 J e. 25 J
A geyser such as Old Faithful in Yellowstone Park is similar to a
A) vacuum bottle. B) canteen. C) coffee percolator. D) teakettle. E) vat of molten lead.
If the frequency of blinks for a light source appears to double as the light source approaches you, the frequency of blinks as it moves away from you at the same speed
A) is halved. B) is doubled. C) stays the same.