A small, 250-μm-diameter bead is fired horizontally into 20∘C olive oil (η = 8.4×10−2Pa⋅s) at a speed of 0.29 m/s. Its stopping distance in the olive oil is 11 μm. What is the mass of the bead in μg? I'm not sure which equation I'm supposed to be using, or how to come up with one.

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?