Page 1601 - College Physics For AP Courses

Answer Key 1589
21
Figure 4.24.
The diagram has a black dot and three solid red arrows pointing away from the dot. Arrow Ft is long and pointing to the left and slightly down. Arrow Fw is also long and is a bit below a diagonal line halfway between pointing up and pointing to the right. A short arrow Fg is pointing down.
Fg is the force on the kite due to gravity.
Fw is the force exerted on the kite by the wind.
Ft is the force of tension in the string holding the kite. It must balance the vector sum of the other two forces for the kite to float stationary in the air.
23
(b)
25
(d)
27
A free-body diagram would show a northward force of 64 N and a westward force of 38 N. The net force is equal to the sum of the two applied forces. It can be found using the Pythagorean theorem:

Since ,

The boulder will accelerate at 0.09 m/s2.
29
(b)
31
(b)
33
(d)
Chapter 5
Problems & Exercises
1

4
(a) 588 N
(b) 6