Problem solving

timer Asked: Dec 16th, 2018
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Question description

Answering step by step as showing as much work as possible. The first questions has four parts that explain each of the parts that have to be found and solve, then the last two have three parts that need to be solve. Last question has a graph in order for the solving of the question.

Graded Assignment Name: SCI403A: Physics | Unit 7 | Lesson 12: Unit Test dg Date: Graded Assignment Physics A Unit 7Test, Part 2 (25 points total, 3 questions) (8 points) 1. During a medieval siege of a castle, the attacking army uses a trebuchet to hurl heavy stones at the castle walls. If the trebuchet launches the stones with a velocity of +18.0 m/s at an angle of 50.0° find the following: a) How long will each stone be in the air? Show all work. b) What is the maximum height of the launched stones? Show all work. c) What is the range (horizontal distance) that the stone will travel? Show all work d) What is the velocity of each stone as it hits the ground? (9 points) 2. A 75.0 kg astronaut is training for accelerations that he will experience upon reentry. He is placed in a centrifuge (r = 20.0 m) and spun at a constant angular velocity of 15.0 rpm (revolutions per minute). He is then slowed and brought to a stop in 2.0 minutes. a. Find the magnitude and direction of the centripetal acceleration and force when he is spinning at constant angular velocity. b. How many g’s is the astronaut experiencing when moving at constant angular velocity? c. Find the torque that is needed to bring the centrifuge to a stop knowing the centrifuge has a mass of 5500.0 kg (ignore all other forces) and the force is applied at the edge of the centrifuge (20.0 m radius). Hint: torque is based on the change of linear velocity. (8 points) 3. © 2009 K12 Inc. All rights reserved. Revised 2016 dg Copying or distributing without K12’s written consent is prohibited. Page 1 of 2 Graded Assignment SCI403A: Physics | Unit 7 | Lesson 12: Unit Test dg An astronaut lands on an alien planet. He uses a pendulum (L = 1.5m) to produce simple harmonic motion, as shown in this graph. Answer the following questions showing all work! a. What is the period and frequency of the pendulum’s motion? (Time on the graph which is on the x axis is in seconds) b. At what times will the pendulum be at its equilibrium point? c. What is the acceleration due to gravity on the surface of the planet in m/s 2? © 2009 K12 Inc. All rights reserved. Revised 2016 dg Copying or distributing without K12’s written consent is prohibited. Page 2 of 2

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