An l-shaped bracket lying in a horizontal plane supports a load p 5 150 lb (see gure). the bracket has a hollow rectangular cross section with thickness t 5 0.125 in. and outer dimensions b 5 2.0 in. and h 5 3.5 in. the centerline lengths of the arms are 5 20 in. 1b and b 5 30 in. 2 considering only the load p, calculate the maximum tensile stress s t , maximum compressive stress s c, and maximum shear stress t max at point a, which is located on the top of the bracket at the support.

Iwill give 30 points to whoever answers ! what is the formula for actual mechanical advantage and ideal mechanical advantage?

Acylinder with a movable piston contains 11.7 moles of a monatomic ideal gas at a pressure of 1.32×10^5 pa. the gas is initially at a temperature of 300 k. an electric heater adds 43200 j of energy into the gas while the piston moves in such a way that the pressure remains constant. cp=20.79 j k^−1 mol^−1 for a monatomic ideal gas, and that the number of gas molecules is equal to avogadro's number (6.022×10^23) times the number of moles of the gas. (a) what is the temperature of the gas after the energy is added? (b) what is the change in volume of the gas? (c) how much work is done by the gas during this process?

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve