A sample of blood is placed into a centrifuge of radius 15.0 cm. The mass of a red corpuscle is 3.0 × 10^?16 kg, and the centripetal force required to make it settle out of the plasma is 4.0 × 10^?11 N. At how many revolutions per second should the centrifuge be operated?
150 rev/s (9000 rpm)
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The electromagnetic force is stronger than gravity. Why is it over-powered by gravity on large scales?
A) Most objects are electrically neutral. B) The electromagnetic force only works on scales of about an atomic nucleus. C) The electromagnetic force follows an inverse cube law with distance, rather than an inverse square law. D) Electrical charge is canceled out by mass.
According to the standard model of fundamental particles, some of the fundamental particles form the "bricks" of the universe, while others form the "cement." Which among the following is one of the fundamental "cement" parti
A) the Z particle B) positron C) the neutrino D) the quark E) the proton
A car enters a level, unbanked semi-circular hairpin turn of 300 m radius at a speed of 40 m/s. The coefficient of friction between the tires and the road is ? = 0.25 . If the car maintains a constant speed of 40 m/s, it will
a. attempt to dig into the road surface. b. tend to veer toward the center of the semicircle. c. arrive safely at the end of the semicircle. d. tend to veer toward the outside of the circle. e. veer toward the center for the first quarter-circle, then veer toward the outside for the second quarter-circle.