The average weight of americans has increased over the years. what is the average mass of an american male in 2010 degrees (there is approximately 2.2 pounds in one kilogram.

a) 1.1 x 10^-2 kg
b)8.8 x 10^1 kg
c) 2.0 x10^2 kg
d) 4.3 x10^2 kg

Avery hard rubber ball (m = 0.5 kg) is falling vertically at 4 m/s just before it bounces on the floor. the ball rebounds back at essentially the same speed. if the collision with the floor lasts 0.05 s, what is the average force exerted by the floor on the ball?

Work = force × a. work b. energy c. distance d. momentum

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)