home work 4 qustions
Problem 1 and 2 for Lesson 14 Impact Section 15-4
Problem 1:
The 5.5-Mg pickup truck and 2.5-Mg car are traveling with the velocities shown just before they collide. If the coefficient of restitution between the truck and car is e =0.75 compute the velocities and the loss of energy due to the collision.
Problem 2:
Blocks A and B have a mass of 15 kg and 25 kg, respectively. If B slides on the surface for which µk = 0.4 has a velocity of 15 m/s when S=7m from A. If the unstretched spring has a stiffness k = 1200 N/m, determine the maximum compression of the spring due to the collision. Take e = 0.80.
Problem 3 and 4 for Lesson 15 Rigid body kinematics section 16-1-2
Problem 3:
The bucket is hoisted by the rope that wraps around a drum wheel. If the angular displacement of the wheel is θ = (20 t + 2t ^3) rad, where t is in seconds, determine the velocity ,acceleration and the distance it travels in three seconds.
Problem 4:
Pulley A starts at ωA0 = 5.5 rad/s when θ =0, and is gives an angular acceleration of α= 0.95θ rad/s2 where θ is in radians. Determine the magnitude of acceleration of point B on pulley C when A rotates 4 revolutions. Pulley C has an inner hub which is fixed to its outer one and turns with it.
