Aspherical protein of molar mass 4.5x100 g/mol and density 1.33x10 kg/m3 is placed at the top of a 2-cm-long centrifuge tube filled with a fluid of density 1.1x103 kg/m3 and viscosity of 1.8x10 pa-s. in the centrifuge, the sample is placed at a distance 20 cm from the rotation axis, and the centrifuge is then run at 3000 revolutions per second (i. e. 3000 hz). a) what is the diameter of these proteins? b) what is the terminal speed of these proteins under centrifugation? c) approximately how long will it take the proteins to sediment to the bottom of the tube?

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

truck y has a greater velocity than truck x.

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods