When a light ray in water (n = 1.33) enters glass with index of refraction 1.60, what is the greatest angle of refraction that can occur?
A. 90.0 
B. 56.2 
C. 52.2 
D. 38.7 
E. 0.0 
B. 56.2
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An AC voltage source, with a peak output of 120 V, results in dissipation of energy in a resistor at rate of 50.0 W. What is the value of the resistance?
a. 100 W c. 144 W b. 120 W d. 72.0 W
Among spiral galaxies, an "SBa" has
A: no bar, tight smooth spiral arms, and a small bulge. B: a bar, tight smooth spiral arms, and a large bulge. C: a bar, very loose smooth spiral arms, and a moderate-sized bulge. D: no bar, loose spiral arms, and almost no bulge. E: a bar, jagged spiral arms, and a small bulge.
A 50-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 30.0° below the horizontal is applied to the box
The coefficient of static friction between the box and the surface is 0.40, and the coefficient of kinetic friction is 0.30. What is the force of friction on the box? A) 250 N B) 200 N C) 32 N D) 620 N E) 220 N
A charge of +80 ?C is placed on the x axis at x = 0 . A second charge of ?50 ?C is placed on the x axis at x = 50 cm. What is the magnitude of the electrostatic force on a third charge of 4.0 ?C placed on the x axis at x = 30 cm?
a. 13 N b. 77 N c. 39 N d. 25 N e. 45 N