7. A revolving beacon is situated 3600 feet off a straight shore. If the beacon turns at 2revolutions per minute, how fast does the beam sweep along the shore at a point 4800 feetfrom the nearest point?8. Two ships sail from A at the same time. One sails south at 15 miles per hour; the other sailseast at 25 miles per hour for 1 hour and then turns north. Find the rate of rotation of the linejoining them after 3 hours.9. Differentiate y = (x² – 4)2/(x²) + (1/2)[Arcsec(x/2)].

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7. A revolving beacon is situated 3600 feet off a straight shore. If the beacon turns at 2 revolutions per minute, how fast does the beam sweep along the shore at a point 4800 feet from the nearest point?

7. A revolving beacon is situated 3600 feet off a straight shore. If the beacon turns at 2 revolutions per minute, how fast does the beam sweep along the shore at a point 4800 feet from the nearest point?

Mathematics For Machine Technology

8th Edition

ISBN:9781337798310

Author:Peterson, John.

Publisher:Peterson, John.

Chapter20: Ratio And Propor Tion

Section: Chapter Questions

Problem 20A: In Figure 208, gear A is turning at 120 revolutions per minute and gear B is turning at 3.6...

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Question

7. A revolving beacon is situated 3600 feet off a straight shore. If the beacon turns at 2
revolutions per minute, how fast does the beam sweep along the shore at a point 4800 feet
from the nearest point?
8. Two ships sail from A at the same time. One sails south at 15 miles per hour; the other sails
east at 25 miles per hour for 1 hour and then turns north. Find the rate of rotation of the line
joining them after 3 hours.
9. Differentiate y = (x² – 4)2/(x²) + (1/2)[Arcsec(x/2)].

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