The image of the rare stamp you see through a magnifying glass is
A)
always the same orientation as the stamp.
B)
always upside-down compared to the stamp.
C)
either the same orientation or upside-down, depending on how close the stamp is to the glass.
D)
either the same orientation or upside-down, depending on the thickness of the glass used.
E)
either the same orientation or upside-down, depending on the diameter of the glass used.
C
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You are designing an ac generator with a maximum emf of 8.0 V. If the generator coil has 200 turns, each with a cross-sectional area of 0.030 m2, what should be the frequency of the generator in a magnetic field of 0.030 T?
A) 7.1 Hz B) 7.5 Hz C) 8.0 Hz D) 44 Hz
Stars A and B are both black holes but have different masses. If the mass of star A is twice as much as the mass of star B, the average density of star A, compared to the average density of star B will be
A) the same. B) four times as much. C) one-fourth as much. D) half as much. E) twice as much.
What aspect of the Sun's behavior wraps and distorts the solar magnetic field?
A) the differential spin between the equatorial and polar regions B) sunspot activity due to differential heat dispersion C) plasma fluxes within the core D) the cycle of the reversal of the magnetic poles
A 4.00 kg object is moving at 5.00 m/s NORTH. It strikes a 6.00 kg object that is moving WEST at 2.00 m/s. The objects have a completely inelastic (stick together) collision. The velocity of the 4.00 kg object after the collision is
A. 2.54 m/s at an angle of 35.0 degrees NORTH of WEST. B. 1.93 m/s at an angle of 59.0 degrees NORTH of WEST. C. 1.93 m/s at an angle of 45.0 degrees NORTH of WEST. D. 2.33 m/s at an angle of 59.0 degrees NORTH of WEST. E. 2.33 m/s at an angle of 45.0 degrees NORTH of WEST.