This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ...on the first? Problem 252. A man in an automobile going at a speed of 40 mi. per hour is struck by a stone thrown by a boy. The stone has a velocity of 30 ft. per second and moves in a direction perpendicular to the direction of motion of the automobile. With what velocity does the stone strike the man? Problem 253. A ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ...on the first? Problem 252. A man in an automobile going at a speed of 40 mi. per hour is struck by a stone thrown by a boy. The stone has a velocity of 30 ft. per second and moves in a direction perpendicular to the direction of motion of the automobile. With what velocity does the stone strike the man? Problem 253. A man attempts to swim across a river, mi. wide, which is flowing at the rate of 3 mi. per hour. If he can swim at the rate of 4 mi. per hour, what direction must he take in swimming in order to reach a point directly across on the opposite shore. What distance will he swim relative to the water? How long will it take for him to cross? Problem 254. An ice boat is moving due north at a speed of 60 mi. per hour, and the wind blows from the southwest with a velocity of 40 mi. per hour. What is the apparent velocity and direction of the wind as observed by a man on the boat? Problem 255. A man walks in the rain.with a velocity of 4 mi. per hour. The raindrops have a velocity of 20 ft. per second in a direction making 60 with the horizontal. How much must the man incline his umbrella from the vertical in order to keep off the rain: (a) when going against the rain, (ft) when going away from the rain? If he doubles his speed, what change is necessary in the inclination of his umbrella in (a) and (ft)? Problem 256. The light from a star enters a telescope inclined at an angle of 45 with the surface of the earth. The velocity of light is 186,000 mi. per second and the earth (radius 4000 mi.) makes one revolution in 24 hr. What is the actual direction of the star with respect to the earth? This displacement of light due to the velocity of the earth and the velocity of light is known as aberration of light. Problem 257. A locomotive is moving with a veloci...
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