A plane has an airspeed of 142 m/s. A 30.0 m/s wind is blowing southward at the same time as the plane is flying. What must be the heading of the plane in order to move directly eastward relative to the ground?
A) 77.8° north of east
B) 55.3° north of east
C) 12.2° north of east
D) 11.9° north of east
E) 78.1° north of east
C
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Ideal Gas Law: An ideal gas has a pressure of 2.5 atm, a volume of 1.0 L at a temperature of 30°C. How many molecules are there in this gas? (R = 8.31 J/mol ? K,1.00 atm = 101 kPa, NA = 6.022 × 1023)
A. 6.1 × 1023 B. 6.0 × 1022 C. 2.4 × 1022 D. 2.3 × 1023
Two displacement vectors have magnitudes of 5 m and 7 m, respectively. When these two vectors are added, the magnitude of the sum
A) is exactly 2 m. B) could be as small as 2 m, or as large as 12 m. C) is exactly 12 m. D) is larger than 12 m. E) is exactly 6 m.
A small styrofoam ball of mass 0.120 g is placed in an electric field of 6000 N/C pointing downward. What excess charge must be placed on the ball for it to remain suspended in the field?
A) -16.0 nC B) -18.0 nC C) -57.2 nC D) -125 nC E) -196 nC
A body on the surface of the earth weighs 400 lb. The radius of the earth is about 4,000 miles. If this same body were placed on a 4,000 mile high tower, its weight would be
a. 100 lbs b. 200 lbs c. 400 lbs d. 800 lbs e. 16,000 lbs