All Cepheid variables discovered so far lie in other galaxies
Indicate whether the statement is true or false
FALSE
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Lake Superior has a shoreline of length 2726 miles. What would be its diameter in km if it were a perfectly circular lake? One mile is 1.609 km.
A. 1694 km B. 1396 km C. 539 km D. 698 km E. 270 km F. 847 km
A quantity of an ideal gas is kept in a rigid container of constant volume. If the gas is originally at a temperature of 19°C, at what temperature will the pressure of the gas double from its base value?
A) 91°C B) 38°C C) 311°C D) 273°C E) 122°C
At what point in time is the current produced by the generator at its maximum?c
A. when the plane of the loop is vertical, in the same plane as the two magnetic poles B. when the plane of the loop is at 45? with respect to the line joining the two magnetic poles C. when the plane of the loop is horizontal, in the plane perpendicular to the line joining the two magnetic poles
Gino says that the analog of Gauss's law for the flow of an incompressible fluid of density ? at constant velocity 
is 
for an imaginary surface within the fluid. Lorenzo says that it is true only if the area where the fluid enters the surface and the area where it leaves the surface are both perpendicular to the velocity of the
fluid. Which one, if either, is correct? A.
B.
is not equal to zero if the fluid enters or exits at angles other than 90°.C.
D.
E.