Problem 1: A uniform meter stick has a 60.0 g mass placed at the 20 cm mark. A pivot is placed at the 42.5 cm mark and the mass of the meter stick
20
4225
30
is 125g
At which mark on the meter stick do you need
60g
to attach a 50-g mass so it remains horizontal
in static equilibrium? (You must draw a force
diagram)

You carry a 7.0-kg bag of groceries 1.2 m above the ground at constant speed across a 2.7m room. how much work do you do on the bag in the process? (a) 157j (b) 0.00j (c) 185j (d) 82j

15. one purpose of the tread pattern on a tire is to a reduce tire wear. b. reduce traction c. allow water to flow away from the tire. d. look impressive.

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)