The velocity of an airplane with respect to the ground is 
m/s at an angle of 30.0 degrees NORTH of EAST. The velocity of the airplane with respect to the air is 
m/s at an angle of 60.0 degrees NORTH of EAST. What is the velocity of the air with respect to the ground?
A. 112 m/s at 50.0 degrees NORTH of EAST
B. 102 m/s at 17 degrees SOUTH of EAST
C. 134 m/s at 49 degrees SOUTH of EAST
D. 134 m/s at 17 degrees NORTH of EAST
E. 102 m/s at 65 degrees NORTH of EAST
B. 102 m/s at 17 degrees SOUTH of EAST
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A radiometer has two square vanes (each measuring 1.0 cm by 1.0 cm), attached to a light horizontal cross arm, and pivoted about a vertical axis through the center, as shown in the figure
The center of each vane is 6.0 cm from the axis. One vane is silvered and it reflects all radiant energy incident upon it. The other vane is blackened and it absorbs all incident radiant energy. An electromagnetic wave with an intensity of 0.30 kW/m2 is incident normally upon the vanes. What is the electromagnetic power absorbed by the blackened vane? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 0.030 W B) 0.040 W C) 0.050 W D) 0.060 W E) 0.090 W
A set of twins, Andrea and Courtney, are initially 10 years old. While Courtney remains on Earth,
Andrea rides on a space ship which travels away from Earth at a speed of 0.6c for five years (as measured by Courtney), then turns around and comes back at 0.6c. When Andrea returns, Courtney is 20 years old. How old is Andrea upon her return? A) 10 years B) 12 years C) 15 years D) 18 years E) 20 years
Three point charges are located on the x-axis at the following positions:
Q1 = +2.00 ?C is at x = 1.00 m, Q2 = +3.00 ?C is at x = 0.00, and Q3 = -5.00 ?C is at x = -1.00 m. What is the magnitude of the electric force on Q2? (k = 1/4??0 = 8.99 × 109 N ? m2/C2 ) A) 0.0540 N B) 0.135 N C) 0.158 N D) 0.0810 N E) 0.189 N
Metamorphic foliation is
A) the same as sedimentary layering. B) the prominent orientation of recrystallized minerals. C) caused by the interaction with chemical fluids. D) a layered appearance caused by mineral growth perpendicular to direction of pressure.