(5) The 120 lb boy standing on the 200 lb uniform beam exerts a pull of 40 lb on the rope rigged as shown. Compute the magnitude of the reaction at the pinned support O. Ans: 0 820 lb A

A shell of mass 4 kg is shot upward with an initial velocity of 200 m/sec. The magnitude of the force on the shell due to air resistance is 20 the ground? What is the maximum height? Assume the acceleration due to gravity to be 9.81 m/s². When will the shell reach its maximum height above the ground? The shell will reach maximum height after 18.16 seconds. (Round to two decimal places as needed.) What is the maximum height? The maximum height is 1747 m. (Round to the nearest whole number as needed.) 3 (...) When will the shell reach its maximum height above

Suppose that a motorboat is moving at 42 ft/s when its motor suddenly quits, and that 11 s later the boat has slowed to 23 ft/s. Assume that the resistance it encounters while coasting is proportional to its velocity, so that dv/dt = - kv. How far will the boat coast in all?

Calculate Vn Where i 12.1, µ = 12, s = 0.2, and n = 30. Round your answer to 2 decimal places.