A point charge Q is placed on the x axis at x = 2.0 m. A second point charge, ?Q, is placed at x = 3.0 m. If Q = 40 ?C, what is the magnitude of the electrostatic force on a 30-?C charge placed at the origin?
a. 7.2 N
b. 3.9 N
c. 1.5 N
d. 14 N
e. 8.1 N
c
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Weight and g: By how many newtons does the weight of a 100-kg person decrease when he goes from sea level to mountain top at an altitude of 5000 m? The mean radius of the earth is 6.38 × 106 m.
A. 0.60 N B. 1.5 N C. 2.6 N D. 3.6 N E. 9.8 N
If you consider the total distance and total time for a trip, you are calculating a(an)
A. average speed B. constant speed C. instantaneous speed D. non-uniform speed
Why are there no small craters on the surface of Venus? a. The thick atmosphere protects the surface from small meteorites
b. Old surfaces have been subducted by convection currents. c. Venus formed after the heavy bombardment period. d. Weathering and erosion removed all craters. e. Shield volcanoes prevent small craters to remain on exist on the surface.
A radiometric date is determined from mica that has been removed from a rock. What does the date signify if the mica is found in granite? What does the date signify if the mica is found in schist?
What will be an ideal response?