17. two freight cars, each with a mass of 3.0x105 kg.
collide and stick together. one was initially moving
at 2.2 m/s, and the other was at rest. what is their
final speed? define the system as the two cars.

What happens to an isotope during radioactive decay?

Asquare isothermal chip is of width w=5 mm on a side and is mounted in a substrate such that its side and back surfaces are well insulated; the front surface is exposed to the flow of a coolant at tinf=15 °c. from reliability considerations, the chip temperature must not exceed t=85 °c. if the coolant is air and the corresponding convection coefficient is h=200 w/m2 x k, what is the maximum allowable "power" of the chip? if the coolant is a liquid for which h=3000 w/m2 x k, what is the maximum allowable power of the chip?

(asap) uneven heating of the earth's surface is due primarily to the position of the equator, north pole, sun, or moon?