Exam 3 Questions from Canvas

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Pennsylvania State University *

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211

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Physics

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Apr 3, 2024

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PHYS 211-300K Spring 2021 Exam 3 Part 1 Student values for quantities are assigned within the Canvas quiz. In these questions, those assigned values are represented by a variable inside brackets such as [m]-kg where m is the mass value in kilograms. Question #1 Alternative 1 [5 pts] Three dinner forks move in the same direction. Fork A has mass 6m and speed ½ v. Fork B has mass 2m and speed 3v. Fork C has mass m and speed 3v. Rank the forks in order of increasing linear momentum. Alternative 2 [5 pts] Three dinner forks move in the same direction. Fork A has mass 3m and speed v. Fork B has mass 6m and speed ½v. Fork C has mass m and speed 3v. Rank the forks in order of decreasing linear momentum. Alternative 3 [5 pts] Three dinner forks move in the same direction. Fork A has mass 6m and speed ½ v. Fork B has mass m and speed v. Fork C has mass 2m and speed 3v. Rank the forks in order of increasing linear momentum. Question #2 Alternative 1 [5 pts] You pushed with a constant force of [F]-N at an angle of [q] ○ below horizontal on a harpsichord that moved through a horizontal displacement of [x] m in [t] s. How much work did you do on the harpsichord? Express your answer in joules. Show your formula and answer in your Assignment upload. Alternative 2 [5 pts] You pull with a constant force of [F]-N at an angle of [q] ○ above horizontal on a clavichord that moved through a horizontal displacement of [x] m in [t] s. How much work did you do on the clavichord? Express your answer in joules. Show your formula and answer in your Assignment upload. Question #3 Alternative 1 [5 pts] A spring stores U joules of energy when stretched by x meters. How much energy does the spring store when stretched by 3x meters? Show your formula and answer in your Assignment upload. Alternative 2 [5 pts] A spring stores U joules of energy when compressed by x meters. How much energy does the spring store when compressed by 5x meters? Show your formula and answer in your Assignment upload.

Question #4 Alternative 1 [5 pts] Tom Tomato has a kinetic energy of [K] joules as it flies through the air at [v] m/s. What is Tom’s mass in kilograms? Show your formula and answer in your Assignment upload. Alternative 2 [5 pts] Zen Zucchini has a kinetic energy of [K] joules as it slides along the dinner table. What is Zen’s mass in kilograms when Zen’s speed is [v] m/s? Show your formula and answer in your Assignment upload. Question #5 [5 pts] You and a friend decide to visit the top of Pike’s Peak in Colorado. You hike from the base to the top. Your friend starts from the same location as you and gets in a car to drive to the top where the two of you meet. Your friend and you have the same mass. Who had the greater change in gravitational potential energy? Explain your answer in your Assignment upload. Question #6 Alternative 1 [5 pts] A toy airplane is controlled by a string that keeps it flying in a horizontal circle at a constant speed of [v] m/s. How much work does the string do on the airplane as the airplane goes through [q] revolutions? Explain your answer in a few sentences or by using formulas in your Assignment upload. Alternative 2 [5 pts] A geosynchronous satellite orbits the Earth in a circle at an altitude of 35,786 kilometers. How much work does the gravitational force do on the satellite as the satellite goes through [q] revolutions? Explain your answer in a few sentences or by using formulas in your Assignment upload.

PHYS 211-300K Spring 2021 Exam 3 Part 2 Reminder: Student values for quantities are assigned within the Canvas quiz. In these questions, those assigned values are represented by a variable inside brackets such as [m]-kg where m is the mass value in kilograms. Question #1 [7 pts] During a collision with a wall, the velocity of a [m]-kg ball changes from [vb] m/s toward the wall to [va] m/s away from the wall. If the time the ball was in contact with the wall was [t] ms, what was the magnitude of the average force applied to the ball? Show your formula(s) and answer in your Assignment upload. Question #2 [14 pts] A [m]-kg apple crate starts with a speed of [v] m/s at the bottom of a rough [q] ○ incline as shown in the figure. The crate moves a distance of [s] m up the incline, in [t] s, before coming to rest. How much of the initial kinetic energy was converted into thermal energy? Show your formula(s), calculations and answer in your Assignment upload. Question #3 [11 pts] A [m1]-kg striped bass (a fish) swimming north at [v1] m/s bites and holds onto a [m2]-kg herring (a fish) that was swimming south at [v2] m/s. What is the velocity of the two fish immediately after the bass bites the herring. Show your formula(s), calculations and answer in your Assignment upload. Question #4 [12 pts] A roller coaster car of mass [m] kg moves from position A to position B. The car moves with a speed of [v1] m/s at A. The vertical height of A above ground level is [h1] m. The vertical height of B above the ground is [h2] m. What is the speed in m/s of the roller coaster car at B if friction and air resistance are ignored? Show your formula(s), calculations and answer in your Assignment upload.

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Question #5 Alternative 1 [16 pts] A [m1]-kg leviathan traveling at [v1] m/s suddenly collides elastically with a [m2]-kg kraken travelling at [v2] m/s. What is the speed of the leviathan just after the collision? Show your formula(s), calculations and answer in your Assignment upload. Alternative 2 [16 pts] A [m1]-kg leviathan traveling at [v1] m/s suddenly collides elastically with a [m2]-kg kraken travelling at [v2] m/s. What is the speed of the kraken just after the collision? Show your formula(s), calculations and answer in your Assignment upload. Question #6 [8 pts] A ferret pulled on a toy snake for [t] s with a constant force of [F] N. If the snake moved a total of [x] m parallel to the ferret’s pull, what is the power of the ferret during the [t] s? Show your formula(s), calculations and answer in your Assignment upload. Question #7 [2 pts] Name the unit of power. (Spell the name out. Do not abbreviate.)

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