Chapter 8: Q. 2 (page 540)
If two sides a and b and the included angle C are known in a triangle, then the area K is found using the formula K = ________.
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The displacement d (in meters) of an object at time t (in seconds) is given
(a) Describe the motion of the object.
(b) What is the maximum displacement from its resting position?
(c) What is the time required for one oscillation?
(d) What is the frequency?
When a mass hanging from a spring is pulled down and then released, the motion is called __________ . if there is no frictional force to retard the motion, and the motion is called ______ if there is friction.
Solve each triangle.
Landscaping Pat needs to determine the height of a tree before cutting it down to be sure that it will not fall on a nearby fence. The angle of elevation of the tree from one
position on a flat path from the tree is 30°, and from a second position 40 feet farther along this path it is 20°. What is the height of the tree?
Crankshafts on Cars On a certain automobile, the crankshaft is 3 inches long and the connecting rod is 9 inches long (see the figure). At the time when OPQ is 15°, how
far is the piston (P) from the center (O) of the crankshaft?
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