Awoman stands on a scale in a moving elevator. her massis
60.0 kg and the combined mass of the elevator and scale is
anadditional 815 kg. starting from rest, the elevatoraccelerates
upward. during the acceleration, there is tensionof 9410 n in the
hoisting cable. what does the scale readduring the
acceleration?

Aparticle of mass m is projected with an initial velocity v0 in a direction making an angle α with the horizontal level ground as shown in the figure. the motion of the particle occurs under a uniform gravitational field g pointing downward. (a) write down the lagrangian of the system by using the cartesian coordinates (x, y). (b) is there any cyclic coordinate(s). if so, interpret it (them) physically. (c) find the euler-lagrange equations. find at least one constant of motion. (d) solve the differential equation in part (c) and obtain x and y coordinates of the projectile as a function of time. (e) construct the hamiltonian of the system, h, and write down the hamilton’s equations (canonical equations) of motion.

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

From 0 to 5 seconds john pushed a box 5 meters. from 5 to 10 seconds, paul pushed the same box another 5 meters. who did more work? a. john b. paul c. john and paul did the same amount of work.