A
79 at time t=0, a rock
climber accidentally allows a
piton to fall freely from a high
point on the rock wall to the val-
ley below him. then, after a
short delay, his climbing partner,
who is 10 m higher on the wall,
throws a piton downward. the
positions y of the pitons versus t
during the falling are given in
fig. 2-40. with what speed is the
second piton thrown?
0
3
1 2
t(s)
fig. 2-40 problem 79.

a) cold, dry

explanation:

continental polar masses are cold and dry air masses because the cold air cannot hold much moisture. as they move into warmer air, they can trigger precipitation.

with the invention of the automobile, the woman of the house could drive to the store and get groceries. women were also free to socialize more. during world war ii women were allowed to work in factories to the war effort and could drive to work or ride mass transit buses to their jobs.

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.