A cylindrical space colony 8.00 km in diameter and 30.0 km long has been proposed as living quarters for future space explorers. Such a habitat would have cities, land, and lakes on the inside surface and air and clouds in the center. All this would be held in place by the rotation of the cylinder about the long axis. How fast would such a cylinder have to rotate to produce a 1-g gravitational
field at the walls of the cylinder?
a. 0.049 rad/s
b. 0.035 rad/s
c. 0.0025 rad/s
d. 0.15 rad/s
a
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Friction: 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. 32 N B. 200 N C. 220 N D. 250 N E. 620 N
Carbon-14 is produced in the atmosphere principally by
A) plants and animals. B) cosmic-ray bombardment. C) nitrogen bombardment. D) photosynthesis. E) none of the above
A box slides across a floor and comes to rest. The work done by the frictional force on the box is a. positive
b. negative. c. zero. d. impossible to determine without knowing the coefficient of friction.
The mass of Jupiter can be calculated by
A) measuring the orbital period and distance of Jupiter's orbit around the Sun. B) measuring the orbital period and distance of one of Jupiter's moons. C) measuring the orbital speed of one of Jupiter's moons. D) knowing the Sun's mass and measuring how Jupiter's speed changes during its elliptical orbit around the Sun. E) knowing the Sun's mass and measuring the average distance of Jupiter from the Sun.