A child holds a a 12.8 kg ball at a height of 3.3 m. The child then drop the balls, what is the kinetic energy just before the ball hits the ground?
414 )
42J
70
125 J

The grooves or folds of the brain are called

16. why must the number of electrons lost equal the number of electrons gained in every redox reaction? use 3 – 4 sentences in your own words to address this question. 18. what type of radiation is emitted when chromium-51 decays into manganese-51? show the nuclear equation that leads you to this answer. 19. a radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. what was the identity of the original nucleus? show the nuclear equation that leads you to this answer.

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver