Which of these ideas was part of the earliest model of the atom?
a) atoms can produce streams of charged particles
b) electrons move too fast to describe where they are located
c) neutrons are located in the same place as protons
d) atoms are hard, tiny particles like billiard balls

Acoyote chasing a rabbit is moving 8.00 m/s due east at one moment and 8.80 m/s due south 4.25 s later. let the x axis point due east and the y axis point due north. find the direction of the coyote's average acceleration during that time.

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

One hazard of space travel is debris left by previous missions. there are several thousand masses large enough to detect by radar orbiting the earth, but there are far greater numbers of very small masses such as flakes of paint. calculate the force exerted by a 0.110 mg chip of paint that strikes a space shuttle window at a relative speed of 5.00 ✕ 103 m/s and sticks, given the collision lasts 6.00 ✕ 10-8 s. such a collision chipped the window of the ill-fated challenger in june 1983, causing $50,000 of damage.