You ride on an elevator that is moving upward with constant speed while standing on a bathroom scale. The reading on the scale is
A)
equal to your true weight, mg.
B)
more than your true weight, mg.
C)
less than your true weight, mg.
D)
zero.
E)
could be more or less than your true weight, mg, depending on the value of the speed.
A
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The base SI unit of mass is
A) milligram. B) gram. C) kilogram. D) slug. E) newton.
A solenoid with 500 turns, 0.10 m long, carrying a current of 2.0 A and with a radius of 10-2 m will have what strength magnetic field at its center? (magnetic permeability in empty space µ0 = 4p × 10^-7 T×m/A)
a. 31 × 10^-4 T c. 2.5 × 10^-2 T b. 1.3 × 10^-2 T d. 62 × 10^-4 T
Why can infrared telescopes operate from high flying aircraft and high mountain tops whereas X-ray telescopes must be placed in orbit?
What will be an ideal response?
Velocity: You drive 6.0 km at 50 km/h and then another 6.0 km at 90 km/h. Your average speed over the 12 km drive will be
A. greater than 70 km/h. B. equal to 70 km/h. C. less than 70 km/h. D. exactly 38 km/h. E. It cannot be determined from the information given because we must also know directions traveled.