Assignment 4.pdf - Rowan Introduction to Astronomy...

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Rowan Introduction to Astronomy Activity #4: Momentum, Torque, Gravity/Weight Name: _______________________________________________ Score: _________________________________ 1. In the figure below, two balls collide. Ball A with mass m 1 = 30 kg is initially moving at 20 m/s. Ball B with mass m 2 = 9 kg is moving at 10 m/s. After the collision, ball A is moving at 10 m/s. How fast is ball B moving? Assume that we have an elastic collision between the two balls. Momentum is conserved so the momentum before the collision is equal to the momentum after the collision. [ 20 pts total 20) + (9 10) = (30 10) + (9 (m v) + (m v) = (m v) + (m ] 2. Why is a torque wrench necessary to tighten bolts correctly on an engine head cover that sits on a gasket between it and the engine block? What might happen if a regular wrench is used to tighten the bolts? The torque wrench allows one to precisely set what attribute? (Note: A regular wrench and a torque wrench can both apply torque to a bolt.) [ 15 pts ] _______________________________________________________________________________________________________ _______________________________________________________________________________________________________ _______________________________________________________________________________________________________ _______________________________________________________________________________________________________ _______________________________________________________________________________________________________ Show your work here: [ 5 pts ] Velocity of ball B after the collision is ______________________ m/s. [Round to 1 decimal.] [ 15 pts ] v 2 = ? m/s v 1 = 10 m/s u 1 = 20 m/s u 2 = 10 m/s (30 20) + (9 10) = (30 10) + (9 (m v) + (m v) = (m v) + (m ?)

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