21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 18, Problem 31QP
To determine

The speed of the falling rain.

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Q. At noon, ship A is 200 km east of ship B and ship A is sailing north at 30 km/h. Ten minutes later, ship B starts to sail south at 35 km/h.  a. What is the distance between the two ships at 3 pm?  b. How fast (in km/h) are the ships moving apart at 3 pm?
Two cars with a  distance of 100 m between them are moving in the same direction with the same speed.At t= 0sec,the cars apply to constant acceleration with same magnitude but opposite direction simultaneously.At the 5th second the cars are at the same position and one of the car is stopping . calculate the velocity of the moving car at 5 the second.
When you look at the surface of a music CD, you see the colors of a rainbow. (a) Estimate the distance between the curved lines (to be read by the laser). (b) Estimate the distance between lines, noting that a CD contains at most 80 min of music, that it rotates at speeds from 200 to 500 rev/min, and that 2/3 of its 6-cm radius contains the lines.
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