Energy Use with questions 1 – 4. A 2.0 x 10 3kg racecar accelerates from 25 m/s to a speed of 55 m/s in 8.0 seconds.

1. What was the kinetic energy of the racecar before it accelerated? KE = J
2. What was the kinetic energy of the racecar after it accelerated? KE = J
3. How much work was done by the racecar in accelerating? W = J
4. Ignoring drag, how much power was developed by the racecar in accelerating?

Which of the following explains why it took so long for the public to accept the negative health effects of smoking? a)people were waiting for counter reasons, and those were presented.b)scientists had not completely finalized their results, which took 30 years.c)cigarettes were cheaply available and media channels were very inefficient.d)cigarette manufacturers were trying hard to bring an alternative into the market

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

How do the kidneys affect homeostasis