HW #6 - homework 06 – FONTENOT, BRIAN – Due: Feb 25...

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homework 06 – FONTENOT, BRIAN – Due: Feb 25 2008, 4:00 am 1 Question 1, chap 7, sect 1. part 1 of 3 10 points Assume you are on a planet similar to Earth where the acceleration of gravity g 10 m / s 2 . A plane 50 m in length is inclined at an angle of 16 . 3 as shown. A block of weight 500 N is placed at the top of the plane and allowed to slide down. 500 N μ = 0 . 5 v 50 m 16 . 3 48 m 14 m The mass of the block is most nearly 1. m 25 kg 2. m 26 kg 3. m 39 kg 4. m 10 kg 5. m 52 kg 6. m 15 kg 7. m 20 kg 8. m 13 kg 9. m 50 kg Question 2, chap 7, sect 1. part 2 of 3 10 points Calculate the magnitude of the normal force exerted on the block by the plane. 1. b V N b ≈ 240 N 2. b V N b ≈ 160 N 3. b V N b ≈ 360 N 4. b V N b ≈ 480 N 5. b V N b ≈ 200 N 6. b V N b ≈ 400 N 7. b V N b ≈ 120 N 8. b V N b ≈ 80 N Question 3, chap 7, sect 1. part 3 of 3 10 points Calculate the work done on the block by the gravitational force during the 50 m slide down the plane in J. 1. W 1750 J 2. W 3690 J 3. W 7000 J 4. W 10400 J 5. W 1350 J 6. W 650 J 7. W 3750 J 8. W 5850 J 9. W 2400 J Question 4, chap 7, sect 1. part 1 of 3 10 points Sally applies a horizontal force of 706 N with a rope to drag a wooden crate across a ±oor with a constant speed. The rope tied to the crate is pulled at an angle of 42 relative to the ±oor. The acceleration of gravity is 9 . 8 m / s 2 .
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homework 06 – FONTENOT, BRIAN – Due: Feb 25 2008, 4:00 am 2 m F 706 N 42 How much force is exerted by the rope on the crate? Answer in units of N.
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