A load of 400 N Was moved up a plane inclined at an angle of 30° to the horizontal if the vertical through which the load was raised was 2 m. Calculate the mechanical advantage

Describe the path of a ray that approaches a mirror parallel to the principal axis.

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.

Observations show that interstellar clouds can have almost any shape and