exam-M10-2 - PHY 2048 Midterm Exam Spring 2010 2 Use g =...

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PHY 2048 Midterm Exam Spring 2010 Use g = 9.80 m/s and G = 6.67 × 10 -11 Nm 2 /kg 2 . 2 1. [15 points] A wagon of mass 7.21 kg has an initial velocity of + 2.87 m/s. If the wagon \$ i comes to rest after moving 5.88 m, what force acted on it? Assume the force \$ i is constant and ignore friction. 2. [10 points] A constant force = ( – 18.6 ) N acts through a straight-line r F \$ j displacement = ( + 3.91 – 3.64 ) m. Calculate the work done. Δ r r \$ i \$ j 3. [20 points] A block of mass 3.85 kg is on a horizontal surface whose coefficient of friction is 0.218. A force F = 51.4 N is applied at an angle of θ = 18.6 deg as shown in the drawing. (A) Draw a free-body diagram for the box showing all forces in terms of their x and y components: (B) Calculate the speed of the box 3.5 s after it starts from rest. 4. [5 points] True or False: The net force on an object is zero if the object is traveling at a constant speed. Explain your answer in one sentence.

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5. [15 points] A 7.11 kg mass, initially at rest, is struck by
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This note was uploaded on 12/30/2011 for the course PHY 2048 taught by Professor Laposky,e during the Fall '08 term at Tallahassee Community College.

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exam-M10-2 - PHY 2048 Midterm Exam Spring 2010 2 Use g =...

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