Which person’s watch (if any) measures the coordinate time ?t between those events in some inertial frame?
A. The rider in the merry-go-round
B. The person standing on the ground
C. Both
D. Neither
B. The person standing on the ground
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Force on a Moving Charge: A proton travels at a speed of 5.0 × 107 m/s through a 1.0-T magnetic field. What is the magnitude of the magnetic force on the proton if the angle between the proton's velocity and the magnetic field vector is 30°? (e = 1.60 × 10-19 C)
A. 2.0 × 10-14 N B. 4.0 × 10-14 N C. 2.0 × 10-12 N D. 4.0 × 10-12 N
What happens to the half-life of a radioactive substance as it decays?
A) It remains constant. B) It increases. C) It decreases at a constant rate. D) It decreases at an exponential rate.
1010 Bq = ______ Ci?
a. 2.7 × 10^-11 c. 0.27 b. 3.7 d. 3.7 × 10^10
An object is moving with constant non-zero velocity in the +x-axis. The position versus time graph of this object is
A) a horizontal straight line. B) a vertical straight line. C) a straight line making an angle with the time axis. D) a parabolic curve. E) a hyperbolic curve.