HW11Sol - Jim Guinns PHYS2211 Assignment #11 Solutions...

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Jim Guinn’s PHYS2211 Assignment #11 Solutions These problems are not to be turned in. They are for you to study for the exam. 1. A car has a mass of 1500kg. A truck has a mass of 19000kg and is moving at 30m/s . a.) At what speed would the car have the same magnitude of momentum as the truck? To have equal momenta we have m c v c = m t v t or v c = m t v t / m c = (19000kg) (30m/s) / (1500kg) = v c = 380m/s ! b.) At what speed would the car have the same kinetic energy as the truck. To have equal kinetic energies we have (1/2)m c v c 2 = (1/2)m t v t 2 or v c 2 = m t v t 2 / m c = (19000kg) (30m/s) 2 / (1500kg) = 11400m 2 /s 2 , so v c = 107m/s . Quite a bit less! 2. A 5.00kg mass is dropped (from rest) from 2.00m above the top of a large, vertically aligned spring. The spring has a spring constant of 100N/m . You must solve this using Conservation of Energy. (Hint: where do you want the gravitational potential energy equal to zero?) We set the gravitational and elastic potential energies at zero at the equilibrium point for
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HW11Sol - Jim Guinns PHYS2211 Assignment #11 Solutions...

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