For a long ideal solenoid having a circular cross-section, the magnetic field strength within the solenoid is given by the equation B(t) = 5.0t T,
where t is time in seconds. If the induced electric field outside the solenoid is 1.1 V/m at a distance of 2.0 m from the axis of the solenoid, find the radius of the solenoid.
A) 0.94 m B) 9.0 m C) 0.30 m D) 77 m
A
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If the Moon is setting at noon, the phase of the Moon must be
A) full. B) first quarter. C) third quarter. D) waning crescent. E) waxing crescent.
Which statement about the Moon's orbit is true?
A. The Moon is in synchronous rotation as it orbits Earth. B. The Moon's orbit is aligned with Earth's orbit. C. The Moon is in a geosynchronous orbit around Earth. D. The Moon rotates in the opposite direction than it orbits Earth.
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.
Gino, because as much fluid leaves as enters.
b.
Lorenzo, because is not equal to zero if the fluid enters or exits at angles other than 90°.
c.
Lorenzo, because this is true only when the fluid executes rotational motion.
d.
Gino, because it is true only when the fluid is enclosed on all sides, not when it is flowing.
e.
Lorenzo, because it is true only when the fluid is enclosed on all sides, not when it is flowing.
Think of Bernoulli's equation as it pertains to an ideal fluid flowing through a horizontal pipe. Imagine that you take measurements along the pipe in the direction of fluid flow. What happens to the sum of the pressure and energy per unit volume?
a. It increases as the pipe diameter increases. b. It decreases as the pipe diameter increases. c. It remains constant as the pipe diameter increases. d. No choices above are valid.