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A centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. Such a device is used in medical laboratories, for instance, to cause the more dense red blood cells to settle through the less dense blood serum and collect at the bottom of the container. Suppose the centripetal acceleration of the sample is 4.09 x 103 times as large as the acceleration due to gravity. How many revolutions per minute is the sample making, if it is located at a radius of 3.14 cm from the axis of rotation?
Two identical resistors of R0 = 30 ? are connected head-to-tail. Write an expression for the new length in terms of the old length L.
How does the mass and electric charge of a proton compare with the mass and charge of an electron?
While a woman stands with two feet on a scale, the scale reads 490 N. When she lifts one foot, scale reads more or less.
A flashlight bulb with a resistance of 40 ohm is powered with a six volt battery and produces .75W power. obtain the internal resistance of the battery
A large box with mass 45 kg is being pushed up a ramp at a 32 degree incline at a constant velocity by a man pushing parallel to the incline of 7.80 m. determine the force the man is pushing on the box
a boy pulls a loaded wagon having a total mass m=100kg. He applies a constant force F=100N along the handle at 30 degrees, compute the horizontal force on the wagon
A 10-turn square coil of area 0.036m2 and a 20-turn circular coil are both placed perpendicular to the same changing magnetic field. What is the area of the circular coil
A rock of mass 43.00 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 252N. What is the magnitude of the acceleration of the rock.
If the top coil were rotated 90 degrees about a vertical axis through the center of the coil so it is perpendicular to the balance coil, how would the results of the experiment change
A proton is traveling horizontally at 5.4 × 106 m/s south. A magnetic flux density has a magnitude of 0.25 T and is directed north. What is the force on the proton
In attempting to pass the puck to a teammate, a hockey player gives it an initial speed of 2.47 m/s. However, this speed is inadequate to compensate for the kinetic friction between the puck and the ice.
A 7.55-g bullet from a 9-mm pistol has a velocity of 389.0 m/s. It strikes the 0.745-kg block of a ballistic pendulum, what was the velocity of the bullet as it emerged from the block
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