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Physics1A_Midterm2

# Physics1A_Midterm2 - Physics 1A Midterm 2 February 20th...

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Physics 1A February 20 th 2008 Midterm # 2 Name: Discussion section: 1) (33 pts) A mass m, resting on a surface with friction, is connected to a spring at rest. At time t = 0 a projectile of mass m p and velocity v p strikes the mass m. a) Calculate the maximum compression of the spring after the collision, assuming the projectile sticks to the mass. b) Would the spring compress more or less if the projectile bounces elastically off the mass? ( μ k =0.5, m = 0.2 kg, m p =0.05kg, v p =50m/s, k = 25 N/m)

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2) (33 pts) A spring (k = 75 N/m) has an equilibrium length l = 1 m. The spring is compressed to a length 0.5 m and a mass of 2 kg is placed at its free end on a frictionless slope which makes an angle of 40 degrees with respect to the horizontal. The spring is then released. a) If the mass is not attached to the spring, how far up the slope will the mass move before coming to a rest? b) If the mass is attached to the spring, what is the maximum distance reached by the mass up the slope? c) A lab technician accidentally spills sand on the incline, giving it a coefficient of
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Physics1A_Midterm2 - Physics 1A Midterm 2 February 20th...

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