2. an cupha particle is the nucleous of a helium atom, it has a mass of 6 64x16
k. and a charge q + 2 e = 3.2x10-19 c. compare the force of the
electric repulsion betolen alpha particles with the force of gravitat tonal
attraction between them.

Aparticle moves according to a law of motion s = f(t), 0 ≤ t ≤ 12, where t is measured in seconds and s in feet. f(t) = cos(πt/6) (a) find the velocity at time t (in ft/s).

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.

What is the relationship between the direction of motion of the balloon and the wind currents