College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Is the net torque changed when a partner on a seesaw stands or hangs from her end instead of sitting? (Does the weight or the lever arm change?)
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- Wouldn't the torque equal Fx +Fy?arrow_forwardA sanding disk with rotational inertia 4.6x 10 kg-m? is attached to an electric dill whose motor delivers a torque of magnitude 40 N-m about the central axis of the disk. About that axis and with torque applied for 46 ms, what is the magnitude of the (a) angular momentum and (b) angular velocity of the disk?arrow_forward(5) For a body to be stationary in a frame of reference, what conditions must be met regarding forces and torques? Explain what not meeting each of the conditions will result in. (a) Show that the moment of inertia of a uniform thin rod (ruler, shaded grey below in figure) of length L and mass M rotating about its center is 1/12 ML² y (m)4 L/2 F -L/2 L/2 X (m) A constant tangential force of F-2 N (shown) is applied at the end to the initially stationary uniform thin rod of mass 2 kg and length L-6m pivoted about its center at the time t=0 s. This will rotate the rod. (b) Calculate the torque (Nm), and (c) the moment of inertia of the rod. (d) Calculate the angular acceleration of the rod (a rads/s²). (e) What is the angular displacement 0 at t = 1s (in radians and in degrees). (f) What is the angular velocity of the rod v at t = 1s. (g) What are the speeds of the tips of the rod at t = Is (they are the same). 0 -L/2 0 00arrow_forward
- A thin rectangular plate is acted upon by 4 forces as shown. The 200 N makes an angle of 30 degrees with the horizontal. Calculate the net torque on this plate about the center A due to the four forces shown assuming there is no friction at the center. Note: (Angle at a is 30 degrees)arrow_forwardA ruler is suspended on a pivot point and a mass is hanging on each side of the suspension point. The system is in equilibrium. How does the torque on the right side compare to the torque on the left side?arrow_forward(7%) Problem 10: A soccer player extends her lower leg in a kicking motion by exerting a force with the muscle above the knee in the front of her leg. Suppose she produces an angular acceleration of 30.5 rad/s² and her lower leg has a moment of inertia of 0.75 kg-m? . What is the force, in newtons, exerted by the muscle if its effective perpendicular lever arm is 2.1 cm? Grade Summary F = | Deductions 0% Potential 100% Submissions tan() sin() cotan() atan() cosh() oDegrees cos() 7 8. 9. НОME Attempts remaining: 10 (0% per attempt) detailed view asin() E 1^^ 4 acos() sinh() cotanh() 5 * acotan() tanh() 2 3 + END - Radians VOl BACKSPACE DEL CLEAR Submit Hint Feedback I give up! Hints: 0% deduction per hint. Hints remaining: Feedback: 0% deduction per feedback. 1.arrow_forward
- I need help with this physics torque questionarrow_forward(4)arrow_forwardCurrent Attempt in Progress The figure shows a lower leg being exercised. It has a 49-N weight attached to the foot and is extended at an angle ) with respect to the vertical. Consider a rotational axis at the knee, as indicated. (a) When = 89°, find the magnitude of the torque that the weight creates. (b) At what angle ) does the magnitude of the torque have a value of 18 N·m? Axis, 0.55 m 49 N (a) Number i Units (b) Number i Unitsarrow_forward
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