Test3- physics 240

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James Madison University *

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240

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Mechanical Engineering

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Apr 3, 2024

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pdf

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18

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PHYS 240 Fall 2022 PHYS 240 Test 3 TOTAL POINTS 31 / 50 QUESTION 1 1 Egg height 5 / 5 - 0 pts Correct, 15.9 m above the ground. QUESTION 2 2 Egg speed 5 / 5 - 0 pts Correct, 17.7 m/s. QUESTION 3 3 Passenger Car 3 / 5 - 2 pts Correct to begin with conservation of linear momentum, but an elastic collision with two unknowns cannot be solved with just conservation of linear momentum. You must also use conservation of energy, or the equation of relative motion for elastic collisions (see notes). QUESTION 4 4 Train Engine 3 / 5 - 2 pts Correct to begin with conservation of linear momentum, but an elastic collision with two unknowns cannot be solved with just conservation of linear momentum. You must also use conservation of energy, or the equation of relative motion for elastic collisions (see notes). QUESTION 5 5 Skater Velocity Left 0 / 5 - 5 pts This problem could be solved with (see notes). QUESTION 7 7 Spring Energy 5 / 5 - 0 pts Correct, 4 N/m (this is rounded from 3.96694 N/m) QUESTION 8 8 Friction Doing Work 4 / 5 - 1 pts Correct method, calculation error The box has constant velocity, so its KE does not change as it slides down the ramp. QUESTION 9 9 Coefficient of Friction 4 / 5 - 1 pts When on a ramp, the force normal is equal to mg cos(θ). This is the correct method otherwise. QUESTION 10 10 2D Perfectly Inelastic Collision 2 / 5 - 3 pts You are correct to use conservation of linear momentum, but this problem includes motion in more than 1 dimension. It can't be combined to a single 1-D calculation. See notes. impulse/momentum OR Newton's 2nd Law of Motion (see notes). QUESTION 6 6 Skater Velocity Right 0 / 5 - 5 pts This problem could be solved with impulse/momentum OR Newton's 2nd Law of Motion
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