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.

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

Aspecified volume of space contains an electric field for which the magnitude is given by e=e0cos(ωt). suppose that e0 = 20 v/m and ω = 1.0 × 107 s−1. part a what is the maximum displacement current through a 0.80 m2 cross-sectional area of this volume? express your answer with the appropriate units. idisp, max i d i s p , m a x = nothing nothing request answer part b how would this area have to be oriented relative to the electric field to get this maximum displacement current?

Wo small variable-thrust jets are actuated to keep the spacecraft angular velocity about the z-axis constant at ? 0 = 1.16 rad/s as the two telescoping booms are extended from r1 = 1.18 m to r2 = 4.69 m at a constant rate over a period of 124 seconds. the small 19-kg experiment modules at the ends of the booms may be treated as particles, and the mass of the rigid booms is negligible. determine the necessary thrust t for each jet as a function of time where t = 0 is the time when the telescoping action is begun. after you have the general expression for t, answer the questions. show work.