Class Management | Help Week9 Begin Date: 7/27/2023 12:01:00 AM -- Due Date: 8/8/2023 11:59:00 PM End Date: 8/10/2023 11:59:00 PM (5%) Problem 10: Consider a bar, of length 5.5 m, shown in the figure, is constrained to rotate about its left end. In addition to the force exerted at the left end responsible for this constraint, three forces are F3 acting on the bar that generate torques. The magnitudes of the first two forces are 28 N and 37 N, and the first force is acting on the end of the bar at an angle of 290 as shown. F1 D A 33% Part (a) What is the torque, in newton-meters, due to F1 on this bar relative to the left end? Use a coordinate system with positive directed out of the screen. 71 = 1 Grade Summary Deductions 0% Potential 100% sin( cos() tan( 7 ( )|7 8 9 HOME Submissions cotan() asin( acos() E 4 5 6 Attempts remaining: 999 atan() acotan() 1 2 3 (0% per attempt) sinh() detailed view cosh( tanh( cotanh() + - 0 END Degrees O Radians VO Submit Hint I give up! Hints: 0% deduction per hint, Hints remaining: 2 Feedback: 0% deduction per feedback 33% Part (b) What is the torque, in newton-meters, due to F2 on this bar relative to the left end, if this force is acting at the midpoint of the bar? Use a coordinate system with positive directed out of the screen. A 33% Part (c) What is the magnitude of the force F3, in newtons, if the force is a distance 0.15 m from the left end and the bar is not rotating?Class Management | Help Week9 Begin Date: 7/27/2023 12:01:00 AM -- Due Date: 8/8/2023 11:59:00 PM End Date: 8/10/2023 11:59:00 PM (5%) Problem 11: Suppose you exert a force of 165 N tangential to the outer edge of a grindstone (which is a solid disk) with a radius of 1.4 m and a mass of 77.5 kg. 4 33% Part (a What is the torque 7, in newton meters, you are exerting on the grindstone, relative to the center of mass of the grindstone? T = N . m Grade Summary Deductions 0% Potential 100% sin() cos() tan() 7 8 9 Submissions cotan( asin() acos() 4 5 6 Attempts remaining: 999 (0% per attempt) atan( acotan() sinh() 1 2 3 detailed view cosh( tanh() cotanh() + 0 Degrees O Radians VO Submit Hint I give up! Hints: 0% deduction per hint. Hints remaining: 1 Feedback: 0% deduction per feedback. 4 33% Part (b) What is the angular acceleration of the grindstone co, in radians per square second, assuming negligible friction? A 33% Part (c) What is the angular acceleration of the grindstone af, in radians per square second, if there is an opposing frictional force of 18 N exerted 0.45 m from the axis?Class Management | Help Week9 Begin Date: 7/27/2023 12:01:00 AM -- Due Date: 8/8/2023 11:59:00 PM End Date: 8/10/2023 11:59:00 PM (5%) Problem 13: A thin cylindrical ring starts from rest at a height h1 = 79 m. The ring has a radius R = 46 cm and a mass M= 10 kg. R 2 h, h, U Otheexpertta.com 410% Part (a) Write an expression for the ring's initial energy at point 1, assuming that the gravitational potential energy at point 3 is zero. E1 = select part Grade Summary Deductions Potential 100% a B () 7 8 9 HOME Submissions a d g 45 6 Attempts remaining: 999 1 2 3 (0% per attempt) h2 detailed view K M P 0 V 1 V 2 VO Submit Hint I give up! Hints: 0% deduction per hint. Hints remaining: 1 Feedback: 0% deduction per feedback 20% Part (b) If the ring rolls (without slipping) all the way to point 2, what is the ring's energy at point 2 in terms of h2 and 12? 4 20% Part (c) Given h2 = 41 m, what is the velocity of the ring at point 2 in m/s? 4 20% Part (d) What is the ring's rotational velocity in rad/s at point 2? 4 20% Part (e) After passing point 2 the hill becomes frictionless and the ring's rotational velocity remains constant. What is the linear velocity of the ring at point 3 in m/s?Class Management | Help Week9 Begin Date: 7/27/2023 12:01:00 AM -- Due Date: 8/8/2023 11:59:00 PM End Date: 8/10/2023 11:59:00 PM (5%) Problem 9: Suppose we want to calculate the moment of inertia of a 68.5 kg skater, relative to a vertical axis through their center of mass. 50% Part (a) First calculate the moment of inertia (in kg.m-) when the skater has their arms pulled inward by assuming they are cylinder of radius 0.145 m. Ib = 0.7200 - Correct! *50% Part (b) Now calculate the moment of inertia of the skater (in kg.m-) with their arms extended by assuming that each arm is 5% of the mass of their body Assume the body is a cylinder of the same size, and the arms are 0.85 m long rods extending straight out from the center of their body being rotated at the ends. I = 1.8 Grade Summary Deductions 0% Potential 100% sin() cos() tan() It ( ) 7 8 9 HOME Submissions cotan( asin() acoso E M 1 4 5 6 Attempts remaining: 997 (0% per attempt) atan() acotan() sinh() $ 1 2 3 detailed view cosh() tanh() cotanh() + 0 END 0% Degrees O Radians VO BACKSPACE DEL CLEAR 0% Submit Hint I give up! Hints: 0% deduction per hint. Hints remaining: 1 Feedback: 0% deduction per feedback