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# ps3 - to the ground The ground slopes upward at an angle of...

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Assignment 3, Phys1112, Spring 2010 Due Monday Feb. 15 Additional Problems: Problem 5 A river ﬂows due north with a speed of 3 m/s. The river is 700 m wide. A man directs his boat to the other side of the river, and his speed relative to the water is 4 m/s due East. (a) What is the velocity of the boat relative to the Earth? (b) How far north of his starting point will he reach the opposite shore? Problem 6 Someone applies a constant horizontal force of 100.0 N to a crate on a smooth icy surface, with negligible friction. The crate starts from rest and moves 10 m in in 5 s. (a) What is the mass of the crate? (b) How far has the block moved in 8s? Problem 7 A skier of mass m is pulled up a slope at a constant speed by a tow rope that is parallel
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Unformatted text preview: to the ground. The ground slopes upward at an angle of θ above the horizontal. (a) Draw a clearly labeled free body diagram for the skier. (b) What is the tension in the tow rope? (c) If the tow rope is cut at a distance D up the slope, what is the skier’s speed when he is back at the bottom? Ignore friction. Problem 8 Two crates, one of mass m 1 the other of mass m 2 sit on the surface of a smooth frozen pond, with negligible friction. The crates are connected by a rope. A person pulls on mass m 2 using a second rope, and this gives the crates an acceleration a . (a) Draw free body diagrams for both crates. (b) What is the tension in the rope the person is pulling on? (c) What is the tension in the rope connecting the crates? 1...
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