An astronomical unit (AU) is equal to the average distance from the Earth to the sun, about 92.9 × 106 mi. A parsec (pc) is the distance at which 1 AU would subtend an angle of 1 second of arc. How many miles are there in a parsec?
What will be an ideal response?
1.92 × 1013 miles
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Which two bodies have substantial atmospheres?
a. Mercury and Venus b. Mercury and Earth c. Mercury and Earth’s Moon d. Earth and Venus e. Earth and Mars
Charge Q is distributed uniformly along a semicircle of radius a. Which formula below gives the correct magnitude of the electric field at the center of the circle?
A.
.B.
.C.
.D.
.E.
.The side mirror on a car is convex and has a radius of curvature of 25 cm. Another car is following, 20 m behind the mirror. If the height of the car is 1.6 m, how tall is the image?
A) 5 cm B) 2 cm C) 4 cm D) 3 cm E) 1 cm
Two long parallel wires placed side-by-side on a horizontal table carry identical current straight toward you. From your point of view, the magnetic field at the point exactly between the two wires
A) points up. B) points down. C) points toward you. D) points away from you. E) is zero.