Suppose two worlds, each having mass m and radius r, coalesce into a single world. due to gravitational contraction, the combined world has a radius of only 3 4 r. what is the average density of the combined world as a multiple of rho0, the average density of the original two worlds?

Gam radio signals can usually be heard behind a hill, but fm often cannot. that is, am signals bend more than fm. explain. (radio signals, as we shall see, are carried by electromagnetic waves whose wavelength for am is typically 200 to 600 m and for fm about 3 m.)

The 20@kg wheel has a radius of gyration about its center g of kg = 300 mm. when it is subjected to a couple moment of m = 50 n # m, it rolls without slipping. determine the angular velocity of the wheel after its mass center g has traveled through a distance of sg = 20 m, starting from rest.

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart