Two particles move about each other in circular orbits under the influence of gravitational forces, with a period τ. their motion is suddenly stopped at a given instant of time, and they are then released and allowed to fall into each other. prove that they collide after a time τ/(4 2).

You are about to open a container of soy milk but notice that there are instructions to “shake well before serving.” the soy milk is most likely a

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?

Currents in dc transmission lines can be 100 a or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. for a line that has current 150 a and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? express your answer in teslas and as a percentage of the earth’s magnetic field, which is 0.50 g. is this value cause for worry?