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A centrifuge is a device in which a small container of material is rotated at 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 6.25 x 10^3 times large as the acceleration due to gravity. how many revolutions per minutes is the sample making, if it is located at a radius of 5.00 cm from the axis of rotation?
The pulley system shown in the figure is used to lift a 53 kg crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assume that the masses of the chains, pulleys, and ropes a..
A brick weighing 30 N falls from a height of 15 m and sinks 0.7 m into the ground. What is the average force on the rock due to the ground as it sinks into the ground
q1. an outfielder throws a 0.150 kg baseball at a speed of 50.0 ms and an initial angle of 30.0deg. what is the kinetic
What is the surface temperature of Betelgeuse, a red giant star in the constellation of Orion, which radiates with a peak wavelength of about 970 nm
Three point charges Q1 = 2.2 mu or micro C, Q2 = 4.2 mu or micro C and Q3 = 3.2 mu or micro C, are arranged as shown
One of the mooring lines of USS BOXER (LHD-4) is under a tension of 4500 N and is set into resonance by the vibration of a CHT pump. What is the period of the 2nd harmonic
A blue car with mass mc= 459 kg is moving east with a speed of vc= 20 m/s and collides with a purple truck with mass mt= 1246 kg that is moving south with a speed of vt= 10 m/s. find the magnitude of the initial momentum of the car
A block of mass 5kg is attached to a spring of 3000N/m and compressed a distance of 0.3m. What are the period, frequency, and angular frequency
An experiment is performed in deep space with two uniform spheres, one with mass 30.0 kg and the other with mass 106.0 kg. Find the magnitude of the relative velocity with which one sphere is approaching to the other
A steel wire of length 1.92 with circular cross section must stretch no more than 0.300 when a tensile (stretching) force of 410 is applied to each end of the wire. What minimum diameter is required for the wire
A spring with the spring constant K=14N/m is compressed 15cm, What is the Elastic potential energy stored in the spring
In the Bohr model of the hydrogen atom, an electron in the9thexcited state moves at a speed of2.70104m/s in a circular path of radius4.2810-9m. What is the effective current associated with this orbiting electron?
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