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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?
A commuter train blows its horn as it passes a passenger platform at a constant speed of 35.0 m/s. t is the frequency observed by a person on the platform as the train approaches
An object whose weight is 100 Ibf experiences a decrease in kinetic energy of 500 ft. Ibf and an increase in potential energy of 1600 ft. Ibf. The initial velocity and elevation of the object, each relative to surface of the earth, are 50 ft/s and 40..
A 100kg block is sitting at rest on a horizontal table. what is the force the table exerts on the block
A tow truck pulls a car 4.00 km along a horizontal roadway using a cable having a tension of 910 N, How much work does the cable do on the car if it pulls horizontally
A 232-kg satellite is in circular orbit around the Earth and moving at a speed of 4.88 km/s. How much work must be done to move the satellite into another circular orbit
Consider a 9.5-mm-diameter wire made from copper (mass density 8.9 g/cc, resistivity 1.7E-8 ohm-m). What is the electric field (in V/m) in the wire
How far in front of the cattle should the pilot release the hay so that the bales will land at the point where the cattle are stranded.
Two positive charges of 7.40 micro-Coulombs are placed on a horizontal surface with a coefficient of static friction 0.72. If they are originally far apart.
Hydraulic engineers often use, as a unit of volume of water, the "acre-foot", defined as the volume of water that will cover 1 acre of land to a depth of 1 ft. A severe thunderstorm dumps 3.0 in. of rain in 30 min on a town of area 30 km2. What vo..
A baseball player hits the ball and it lands in the field seat 10 m above the point, find the c and y components of the initial velocity vector of the baseball
question1a uniform electric field of magnitude 642 nc exists between two parallel plates that are 4.06 cm apart. a
A 2.5 meter long elastic cord is fixed at both ends. at what frequency should this cord be vibrated such that a n-10 standing wave is produced
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