A helicopter stays aloft by pushing large quantities of air downward every second. What mass of air must be pushed downward at 35.0 m/s every second to keep a 1 500-kg helicopter aloft?
a. 42.9 kg
b. 420 kg
c. 430 kg
d. 410 kg
e. 415 kg
b
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Given that a vector extends from the origin to (-5.0 cm, 8.0 cm), find the direction of the vector from the positive x-axis.
A. 32
B. 58
C. 148
D. 122
Free or low-cost ______ images, including photographs and clip art, are available online.
A. stock B. generic C. spec D. streaming
A series of ocean waves, 2.5 m between crests, move past at 2.0 waves/s. Find their speed
a. 2.5 m/s c. 8.0 m/s b. 5.0 m/s d. 10 m/s
If Earth had a pair of identical moons on opposite sides of the same circular orbit, the center of gravity of the double-moon-Earth system would be
A) inside the Earth, but off center. B) at the center of the Earth. C) outside the Earth, but within the orbital path of the moons. D) outside the Earth, but beyond the orbital path of the moons.