The 90-lb boy stands on the beam and pulls on the cord with a force large enough to just cause him to slip. if the coefficient of static friction between his shoes and the beam is µs = 0.40, determine the reaction at a in lb. the beam is uniform and has a weight of 100 lb. neglect the size of the pulleys and the thickness of the beam.

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

Which of the following refers to refers to how well the control system responds to sudden changes in the system. a)-transient regulation b)- distributed regulation c)-constant regulation d)-steady-state regulation

10 kg of co2 is initially contained at 400 kpa and 300 k. the gas constant for carbon dioxide is 189 j/lkg k) and has a specific heat ratio, k, of 1.289. isentropic expansion then occurs until the pressure is 200 kpa. a) determine the initial volume of co2 in m. b) determine the final temperature in k. c) determine the work done by the system during the expansion kl.