Physics 15200- HW9

# Physics 15200- HW9 - b What is the speed oF the crate aFter...

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lai (yl8859) – HW09 – Ross – (15200) 1 This print-out should have 7 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 (part 1 oF 2) 10.0 points A 7 kg object is given a displacement Δ vs = (5 m)ˆ ı + (2 m)ˆ + ( - 4 m) ˆ k along a straight line. During the displace- ment, a constant Force oF v F = (6 N)ˆ ı + ( - 4 N)ˆ + (1 N) ˆ k acts on the object. ±ind the work done by v F For this displace- ment. Answer in units oF J. 002 (part 2 oF 2) 10.0 points ±ind the component oF v F in the direction oF this displacement. Answer in units oF N. 003 (part 1 oF 2) 10.0 points A crate is pulled by a Force (parallel to the incline) up a rough incline. The crate has an initial speed shown in the fgure below. The crate is pulled a distance oF 7 . 94 m on the incline by a 150 N Force. The acceleration oF gravity is 9 . 8 m / s 2 . 13 kg μ = 0 . 308 150 N 1 26 m / s 35 a) What is the change in kinetic energy oF the crate? Answer in units oF J. 004 (part 2 oF 2) 10.0 points
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Unformatted text preview: b) What is the speed oF the crate aFter it is pulled the 7 . 94 m? Answer in units oF m / s. 005 10.0 points A person doing a chin-up weighs 536.9 N, disregarding the weight oF the arms. During the frst 24.9 cm oF the liFt, each arm exerts an upward Force oF 444 N on the torso. The acceleration oF gravity iF 9 . 81 m / s 2 . IF the upward movement starts From rest, what is the persons speed at this point? Answer in units oF m / s. 006 (part 1 oF 2) 10.0 points A 57 . 8 kg box initially at rest is pushed 3 . 29 m along a rough, horizontal oor with a constant applied horizontal Force oF 229 . 581 N. IF the coecient oF Friction between box and oor is 0 . 376, fnd the work done by the Friction. The acceleration oF gravity is 9 . 8 m / s 2 . Answer in units oF J. 007 (part 2 oF 2) 10.0 points ind the the fnal speed oF the box. Answer in units oF m / s....
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