D Question 1 1 pts A 2.1 kg stone is tied to a 1.4 m long string and swung aroun

Question

D Question 1 1 pts A 2.1 kg stone is tied to a 1.4 m long string and swung around a circle at a constant angular velocity 7.9 1/s. Find the magnitude of the torque about the origin. DQuestion 2 1 pts A uniform meter stick is placed on and parallel to the x axis, with the 50 cm mark at the origin. It is pivoted at the 50 cm mark. A 4.2 N force is applied at the 19 cm mark, and a -9.1 N force is applied at the 31 cm mark. Find the net torque on the rod. NOTE: Define up to be the +y-direction. D Question 3 1 pts When a woman on a frictionless rotating turntable extends her arms out horizontally, her angular motnenhum O must remain the same O may increase or decrease, depending on how quickly she raised her arms O must decrease O tilts away from the vertical O must increase

Explanation / Answer

1)

Torque T = I*alpha

since angular velocity is constant

then angular accelaration alpha = 0 rad/s^2

torque T = I*0 = 0 N-m

2) Nte torque is T = (4.2*(0.5-0.19)) - (9.1*(0.5-0.31)) =-0.427 N-m

3) angular momentum L =m*v*r

by extending arm r increases and there by L also increases

then her angular momentum also increases

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