A fire fighter tightens the nut on the top of a fire hydrant using a large wrench. If she applies a force of 250N perpendicular to the wrench, at a point 0.75m from the axis of rotation of the nut, how much work does she do on the nut as she rotates it through 
?
A. 190 J
B. 150 J
C. 290 J
D. 130 J
B. 150 J
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Of the possible statements that parallel rays are brought to a focus by a 1) concave mirror, 2) convex mirror, 3) converging lens, 4) diverging lens, the correct answer is
a. 1 and 2. b. 3 and 4. c. 1 and 3. d. 2 and 3. e. 2 and 4.
What makes pink ink pink?
a. refraction c. dispersion b. selective absorption d. none of the above
Find the average density of a white dwarf star if it has a mass equal to that of the sun (2.0 × 10^30 kg) and a radius equal to that of the Earth (6.4 × 10^6 m)
a. 9.0 × 10^6 kg/m3 b. 1.8 × 10^7 kg/m3 c. 1.8 × 10^9 kg/m3 d. 3.6 × 10^10 kg/m3 e. 9.0 × 10^7 kg/m3
The circuit below shows three resistors in series. R3 > R2 > R1. The resistors are all made of the same wire with the same diameter but have different lengths. Rank the magnitudes of the electric fields in the resistors from least to greatest
a.
E3 < E2 < E1.
b.
E2 < E1 = E3.
c.
E1 = E2 = E3.
d.
E1 = E3 < E2.
e.
E1 < E2 < E3.