A lighthouse at sea level is 34 miles from a boat. It is known that the top of the lighthouse is 42.5 miles from the boat and that x =r cos 0, where x is the horizontal distance, r is the distance of the top of the lighthouse from the boat, and 0 is the angle of depression from the top of the lighthouse. Find 0.
A lighthouse at sea level is 34 miles from a boat. It is known that the top of the lighthouse is 42.5 miles from the boat and that x =r cos 0, where x is the horizontal distance, r is the distance of the top of the lighthouse from the boat, and 0 is the angle of depression from the top of the lighthouse. Find 0.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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1. A lighthouse at sea level is 34 miles from a boat. It is known that the top of the lighthouse is
42.5 miles from the boat and that x =r cos 0, where x is the horizontal distance, r is the
distance of the top of the lighthouse from the boat, and e is the angle of depression from the
top of the lighthouse. Find 0.
2. A trough is in the shape of an inverted triangular prism whose cross section has the shape of
an inverted isosceles triangle. If the length of the base of the cross section is 2/3 meters and
the length of the trough is 100v3 meters, find the size of the vertex angle so that the volume
is 900 m³. ( Hint: V = ")
bhl
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