Wednesday, den 3. February 2010

To withstand “g-forces” of up to 10 g’s, caused by suddenly pulling out of a steep dive, fighter jet pilots train on a “human centrifuge.” 10 g’s is an acceleration of 98m/s2. If the length of the centrifuge arm is 12m , what speed is the rider moving when she experiences 10 g’s ? v___________m/s

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Tuesday, den 2. February 2010

what angular velocity is needed for a centrifuge to produce an acceleration of 1000g (the earth gravity) at a radius arm of 15cm?

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Monday, den 14. December 2009

A sample of blood is placed in a centrifuge of radius 10.0 cm. The mass of a red blood cell is 3.0 multiplied by 10-16 kg, and the magnitude of the force acting on it as it settles out of the plasma is 4.0 multiplied by 10-11 N. At how many revolutions per second should [...]

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Thursday, den 19. November 2009

To test the effects of high acceleration on the human body, NASA has constructed a large centrifuge at the Manned Spacecraft Center in Houston. In this device, astronauts are placed in a capsule that moves in a circular path of radius 15 m. If the astronauts in this centrifuge experience a centripetal acceleration 7 times [...]

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Tuesday, den 29. September 2009

An astronaut is being tested in a centrifuge. The centrifuge has a radius of 10 m and, in starting, rotates according to [theta = (0.30 rad/s^2)t^2], where t is in seconds and theta is in radians. When t = 5.0 s, what are the magnitudes of the astronaut’s (a) rotational velocity, (b) translational velocity, (c) [...]

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Sunday, den 13. September 2009

Suppose you have a laboratory centrifuge that has an effective radius of 1.25 m and that you need, for the task at hand, to produce an acceleration equivalent to 100 g. At what angular velocity must the centrifuge be rotated to produce this acceleration? State results both in radians per second and revolutions per minute, [...]

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