When evaporation at the ocean surface exceeds precipitation, the salinity of seawater
A) increases.
B) decreases.
C) stays the same.
Answer: A
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A bar (L = 80 cm) moves on two frictionless rails, as shown, in a region where the magnetic field is uniform (B = 0.30 T) and into the paper. If v = 50 cm/s and R = 60 m?, what is the magnetic force on the moving bar?
a.
0.48 N to the right
b.
0.48 N to the left
c.
0.32 N to the left
d.
0.32 N to the right
e.
None of the above
The main reason you can walk barefoot on red-hot coals of wood without burning your feet involves
A) low temperature of the coals. B) low conductivity of the coals. C) mind over matter techniques.
Ekapluto is an unknown planet that has two spherical moons in circular orbits. The table summarizes the hypothetical data about the moons. Both moons have low axial spin rates
(G = 6.67 × 10-11 N ? m2/kg2) Mass Radius Orbital radius Orbital period Moon A 4.0 × 1020 kg 2.0 × 108 m 4.0 × 106 s Moon B 1.5 × 1020 kg 2.0 × 105 m 3.0 × 108 m The acceleration due to gravity at the surface of Moon B is A) 0.10 m/s2. B) 0.15 m/s2. C) 0.20 m/s2. D) 0.25 m/s2. E) 0.30 m/s2.
Pennies used to be made of copper, but now they are made of copper-coated zinc. If one were to do a precise calorimetry experiment to determine the specific heat of the new pennies, what would the result be?
a. It would be that of copper since copper is on the outside. b. It would be that of zinc since zinc is in the center. c. It would be the sum of the copper and zinc specific heats. d. It would be between that of copper and that of zinc, depending on coating thickness.