4. In the figure, the horizontal lower arm has a mass of 2.9 kg and its center o

Question

4. In the figure, the horizontal lower arm has a mass of 2.9 kg and its center of gravity is 14 cm from the elbow joint pivot. How much force FM must the vertical extensor muscie in the upper arm exert on the lower arm to hold a 9.5 kg shot put in static equilibrium? Shot put 2.5 cm 30.0 cm Lower Elbow Joint armm. M Upper arma. A. 1500 N B. 130 N C. 100 N D. 1000 N E. 500 N 5. As you open a door, it pushes away from you, and the hinges are on your right. In what direction is the angular velocity vector of the door as it opens? A. down B. up C. left D. right 6. If two forces of equal magnitude act on an object that is hinged at a pivot, the force acting farther from the pivot must produce the larger torque about the pivot. A. True B. False 7. If the torque on a ball adds up to zero, the ball could be both rotating and acceierating linearly A. True B. False 8. A wheel is rolling without slipping, with a linear veiocity v. If we attach a piece of tape to the wheel, when the piece of tape is touching the road (at the bottom of the wheel), its velocity with respect to the road is A. 2v B. V C. 1.5v D. zero 9. The angular momentum of a system remains constant when a constant torque acts upon it. A. True B. False

Explanation / Answer

Ans 5) option B is correct

Ans 6) it is false

Ans 7) False , it would be only rotating

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