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In an isometric exercise a person places a hand on a scale and pushes vertically downward, keeping the forearm horizontal. This is possible because the triceps muscle applies an upward force M perpendicular to the arm. The forearm weighs 20.1 N and has a center of gravity. The scale registers...

Is he just being nice or could he possibly be interested but is shy about it? Does it have anything to do with his friend already dancing with the girl? Does that mean she is off limits to him since his friend is interested to her already?

Is he just being nice or a gentleman or could he possibly be interested? What if he only shook one girl's hand but not another?

The drawing shows an ideal gas confined to a cylinder by a massless piston that is attached to an ideal spring. Outside the cylinder is a vacuum. The cross-sectional area of the piston is A = 2.50 × 10-3 m2. The initial pressure, volume, and temperature of the gas are, respectively, P0, V0 =...