Charges 6.8 ?C, 6.1 ?C, and -1.5 ?C are brought from infinity to the respective vertices of an equilateral triangle with 11. cm sides
$$ (a) How much energy did it take to move the charges to the triangle vertices? (b) What is the potential at the center of the triangle?
(a) 1.8 Joules
(b) 1.6 × 106 volts
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What is the name for the period of time it takes the Moon to circle the Earth once?
What will be an ideal response?
The yearly motion of celestial objects in the sky is caused by
A) the rotation of our planet about its axis. B) the revolution of our planet around the Sun. C) the movement of our planet within the Milky Way. D) the tilt of Earth's axis.
A motor drives a shaft with diameter d 5 46 mm at f 5 5.25 Hz and delivers P 5 25 kW of power. The maximum shear stress in the shaft is approximately:
(A) 32 MPa
(B) 40 MPa
(C) 83 MPa
(D) 91 MPa
Which is stronger, the earth's pull on the moon, or the moon's pull on the earth?
A. the earth's pull B. the moon's pull C. they're the same