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At its Ames Research Center, NASA uses its large "20-G" centrifuge to test the effects of very large accelerations (hypergravity) on test pilots and astronauts. In this device, an arm 8.84m long rotates about one end in a horizontal plane, and the astronaut is strapped in at the other end. Suppose that he is aligned along the arm with his head at the outermost end. The maximum sustained acceleration to which humans are subjected in this machine is typically 12.5g. 1. How fast must the astronaut's head be moving to experience this maximum acceleration? 2. What is the difference between the acceleration of his head and feet if the astronaut is 2.00m tall? 3.How fast in (revolutions per minute) is the arm turning to produce the maximum sustained acceleration?
A uniform solid disk with a mass of 45.00 kg and a radius of 0.393 m is free to rotate about a frictionless axle. Forces of 90.0 and 125 N are applied to the disk.
A 270 ball and a 520 ball are linked by a 50.0-cm-long massless, rigid rod. The structure rotates about its center of mass at 120 rpm. What is its rotational kinetic energy.
An 86 Kg person stands on a uniform ladder 4m long, that weighs 70N. The floor is rough; hence, it exerts both a normal force, and a frictional force, on ladder. The wall, on the other hand, is frictionless; it exerts only the normal force. What a..
What is momentum of a truck speeding down the highway at a given instant? Discuss how the momentum is changed if the truck loses some of its cargo while maintaining the same velocity.
An astronaut stands on the steps of her spaceship that is resting on the surface of planet x and drops a rock from a height of 4.5 metres. The rock hits the surface in 0.83 s. Determine the magnitude of the acceleration due to gravity on the surfa..
A laser with wavelength d/8 is shining light on a double slit with slit separation 0.3 {rm mm}. This results in an interference pattern on the screen a distance L away from the slits. We wish to shine a second laser, with a different wavelength, t..
A krypton laser produces a cylindrical red laser beam 2.0 in diam with 2.0 of power. What is the light intensity on a wall 2.5 away from laser.
Physics: How much time is required to row cross the river? How wide is the river?, A river man can row his boat at a speed of 2.5 m/s through still water. He wants to row directly across a river that has a current flowing at 1.5m/s
What is the average kinetic energy of an ideal gas.
The Earth can be approximated as a sphere of uniform density, rotating on its axis once a day. The mass of the Earth is 5.97×1024 kg, the radius of the Earth is 6.38×106 m, and the time of rotation for the Earth is 24.0 hrs.
The coefficient of kinetic friction between each brake pad and the rim is μk = 0.85. What is the magnitude of normal force that each brake pad applies to the rim.
find the speed of the block as it hits the ground.A 4-kg ball traveling to the right with a speed of 4 m/s collides with a 5-kg ball traveling to the left with a speed of 2 m/s. What is the total momentum of the two balls after they collide.
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