Density: A styrofoam sphere of radius R has a density ?. You now carefully compress the sphere so its radius is R/2. What is the density of the compressed sphere?
A. 2 ?
B. 4 ?
C. ?
D. ?
E. 8 ?
Answer: E
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A 50-N crate is pulled up a 5.0-m inclined plane by a worker at constant velocity. If the plane is inclined at an angle of 37° to the horizontal and there exists a constant frictional force of 20 N between the crate and the surface, what is the force applied by the worker?
a. zero c. 30 N b. 50 N d. 40 N
A helicopter is flying horizontally with a speed of 444 m/s over a hill that slopes upward with a 2% grade (that is, the "rise" is 2% of the "run"). What is the component of the helicopter's velocity perpendicular to the sloping surfac
A) 8.9 m/s B) 220 m/s C) 435 m/s D) 444 m/s
Seafloor spreading occurs along ______________
a. fault lines b. subduction zones c. mid-ocean ridges d. none of these
Our most detailed knowledge of Uranus and Neptune comes from:
A) spacecraft exploration. B) the Hubble Space telescope. C) ground based visual telescopes. D) ground based radio telescopes. E) manned missions.