30. How much force does it take to accelerate a 34 kg box at a rate of 4 m/s?? a. 136 N
b. 68 N
c. 8.5 N
d. 100 N

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.

If the speed of a particle triples ,by what factor does its kinetic energy increase?

Imagine you had to physically add electrons, one at a time, to a previously neutral conductor. you add one electron very easily, but the second electron requires more work. in your initial post to the discussion, explain why this is. also, what happens to the work needed to add the third, fourth, fifth, and subsequent electrons