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The ultracentrifuge is an important tool for separating and analyzing proteins in biological research. Because of the enormous centripetal accelerations that can be achieved, the apparatus must be carefully balanced so that each sample is matched by another on the opposite side of the rotor shaft. Failure to do so is a costly mistake. Any difference in mass of the opposing samples will cause a net force in the horizontal plane on the shaft of the rotor. Suppose that a scientist makes a slight error in sample preparation, and one sample has a mass 11 mg greater than the opposing sample.
If the samples are 11 cm from the axis if the rotor and the ultracentrifuge spins at 6.5×10^4 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples?
If an R = 1.0-k? resistor, a C= 1.0-µF capacitor, and an L = 0.20-H inductor are connected in series with a V = 150 sin (377t) volts source
A certain type of elementary particle travels at a speed of 2.75×108m/s. What is the particles lifetime at rest in seconds
A 1100 car traveling at a speed of 40 skids to a halt on wet concrete where = 0.50. How long are the skid marks.
Calculate the efficiency of a fossil-fuel power plant that consumes 380 metric tons of coal each hour to produce useful work at the rate of 800 MW
A 10 m beam of mass 340 kg extends over a ledge. The beam is not attached, but simply rests on the surface. How far from the edge of the ledge can the beam extend
Monochromatic light is incident from the top onto two glass plates, as the drawing shows. What happens to the bright fringes
A 0.170 kg tumour is being irradiated by a radioactive source. Each decay of the radioactive source produces a particle with an energy of 0.450 MeV. find the activity of the radioactive source
A disk is reputed to accelerate from 0 to 389 RPM in 3.5 seconds. How many radians does it turn through.
In a serve, a tennis player hits the ball horizontally. Neglect the effects of air resistance and the diameter of the ball. Where will the ball land if it just clears the net
In daily life we see many cases of people who are caught misrepresenting things who soon thereafter are excused and accepted by their contemporaries. How is This different in science.
A house has a floor area of 162.0 m2 and an outside wall that has an area of 40.50 m2. The earth's magnetic field here has a horizontal component of 2.550E-5 T, Determine the magnetic flux through the wall if the wall faces north
Consider the concentric metal sphere and spherical shells. The innermost is a solid sphere that has a radius R1. A spherical shell surrounds the sphere and has an inner radius R2 and an outer radius R3.
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