Some physics students design an apparatus to measure the weight of objects using a beam and fulcrum pivot. One of the students stands on the apparatus to be weighed. The student, of weight w, stands .30m from end A of the uniform beam AB. The beam has a weight of 80N and length 2.om. A fulcrum pivot at P supports the blank and the downward loads and is .50m from end A. A counterweight of 70N is moved to the position 1.80m to balance the weight of the student and to put the system into rotational equilibrium. Determine the weight w of the student.

Which statement best explains why an object weight less on mercury than it does on earth

Which statement is true? a. kepler's laws apply only to the motion of earth. b. kepler's laws can be used to predict eclipses. c. kepler's laws are true for a central force that is directly proportional to distance. d. kepler's laws can be deduced from newton's laws of motion and gravity.

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.