Apulley with radius r and rotational inertia i is free to rotate on a horizontal fixed axis through its center. a string passes over the pulley. a block of mass m1 is attached to one end and a block of mass m2, is attached to the other. at one time the block with mass m1 is moving downward with speed v. if the string does not slip on the pulley, the magnitude of the total angular momentum, about the pulley center, of the blocks and pulley, considered as a system, is given by:
a. (m1 – m2)vr + iv/rb. (m1 + m2)vr + iv/rc. (m1 – m2)vr – iv/rd. (m1 + m2)vr – iv/re. none of the above

Explain what happens at the saturation point when adding salt to water at room temperature.

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?

During the experiment if you could triple the breakaway magnetic force with all other quantities left unchanged, what is the new value for the critical velocity if it was v0 (initial velocity), initially? (b) now if you halved the radius with all other quantities left unchanged, what is the new critical velocity if it was v0 (initial velocity), initially? (c) if during the experiment, critical velocity quadrupled with all other quantities left unchanged, what is the new breakaway force if its magnitude was initially f0,?