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To develop muscle tone, a woman lifts a 4.50 kg mass held in her hand. She uses her biceps muscle to flex the lower arm through an angle of 60.0°. Ignore gravity.
(a) What is the angular acceleration if the mass is 24.0 cm from the elbow joint, her forearm having a moment of inertia of 0.250 kg·m2, and the muscle force being 800 N at an effective perpendicular lever arm of 1.80 cm?
rad/s2
(b) How much work does she do?
J
a 5 kg mass is attached to the end of a 1.0-m string. The system is whirled in a horizontal circular path. What is the maximum speed of the mass if the string is not to break
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A metal sphere centered at the origin has a surface charge density that has a magnitude of 24.1 nC/m2 and a radius less than 2.00 m. What is the sign of the charge on the sphere
A plank 2.00 cm thick and 12.4 cm wide is firmly attached to the railing of a ship by clamps so that the rest of the board extends 2.00 m, find the shear modulus of the wood
A cube made of steel 0.300 meters on a side is suspended from a scale until it is completely immersed in fresh water
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