Einstein's prediction of the curvature of space was confirmed by the 1919 total solar eclipse
Indicate whether the statement is true or false
TRUE
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Two particles have charges Q and -Q (equal magnitude and opposite sign). For a net force of zero to be exerted on a third charge it must be placed:
A) midway between Q and -Q B) on the perpendicular bisector of the line joining Q and -Q, but not on that line itself C) on the line joining Q and -Q, to the side of Q opposite -Q D) on the line joining Q and -Q, to the side of -Q opposite Q E) at none of these places (there is no place)
A long wire carrying a 2.0-A current is placed along the y-axis. What is the magnitude of the magnetic field at a point 0.60 m along the x-axis?
A) 6.7 × 10-7 T B) 13 × 10-7 T C) 1.2 × 10-7 T D) 6.7 T E) 12 T
A 4.0-pC point charge is placed at the center of a hollow (inner radius = 2.0 cm, outer radius = 4.0 cm) conducting sphere which has a net charge of 4.0 pC. Determine the magnitude of the electric field at a point which is 6.0 cm from the point charge.
A. 35 N/C B. 25 N/C C. 30 N/C D. 20 N/C E. 10 N/C
A spaceship is going away from Earth with a speed 0.28c. A passenger in the spaceship measures his heartbeat as 72 beats per minute
How many beats per minute are observed in the telemetry radio signals received on Earth? Note that, in addition to time dilation, one must take into account that the signals of successive heartbeats have to travel longer distances because the spaceship is moving away (Doppler Effect). A) 75 B) 96 C) 54 D) 69 E) 100