Dynamics

Name: _____________________________________ Date: _____________ Physics 201 Exam 2 Dynamics Q1 Q2 Q3 Total Physics 201 1. (10 points) Block A has a mass of 6.00 kg. Block B has a mass of 5.00 kg. The coefficients of friction between two blocks are μs = 0.400 and μk = 0.200. The coefficients of friction between the blocks and the ramp are μs = 0.500 and μk = 0.300. The ramp is angled at 10.0° above the horizontal. The man pulls the blocks up the incline. What is the largest force he can pull with if he doesn’t want the top block to slip? 2. (10 points) Three masses (m1 = 4.00 kg, m2 = 6.00 kg, m3 = 8.00 kg) are hung from ropes and a pulley as shown below. The masses are initial held at rest, and then they are released. Find T1 and T2. 3. (10 points) A 5.00 kg toy plane is tied to a 2.00 m string, which is attached to a vertical pole. The plane’s engine provides a constant 1.00 N force directly forward. The plane starts from rest and speeds up until it is flying completely horizontally (ignore gravity). (a) How fast is the plane flying when it has flown in a circle 6.00 times? (b) The string will break if the tension in it exceeds 200 N. How long can the plane fly before the string breaks?

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