46. What angular speed (in revolutions/second) needed for a centrifuge

Question :   46. What angular speed (in revolutions/second) needed for a centrifuge : 2102142


46. What angular speed (in revolutions/second) is needed for a centrifuge to produce an acceleration of 1 000 g at a radius arm of 15.0 cm?

A. 40.7 rev/s

B. 75.4 rev/s

C. 81.4 rev/s

D. 151 rev/s

47. An airplane in a wide sweeping "outside" loop can create zero gees inside the aircraft cabin. What must be the radius of curvature of the flight path for an aircraft moving at 150 m/s to create a condition of "weightlessness" inside the aircraft?

A. 1 150 m

B. 1 800 m

C. 2 300 m

D. 3 600 m

48. A cylindrical space colony 8 km in diameter and 30 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. 0.05 rad/s

B. 0.10 rad/s

C. 0.15 rad/s

D. 0.20 rad/s

49. The Earth is 93 million miles (mi) from the Sun and its period of revolution is 1 year = 3.15 ´ 107 s. What is the acceleration of the Earth in its orbit about the Sun?

A. 18.6 mi/s2

B. 9.3 ´ 10-3 mi/s2

C. 13.6 ´ 10-6 mi/s2

D. 3.7 ´ 10-6 mi/s2

50. A wheel is rotated about a horizontal axle at a constant angular speed. Next it is rotated in the opposite direction with the same angular speed. The acceleration at a point on the top of the wheel in the second case as compared to the acceleration in the first case:

A. is in the same direction.

B. is in the opposite direction.

C. is upward.

D. is tangential to the wheel.


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