Astring tied to a rock is being twirled around fred’s head at 5 cycles/s. if the rock has a mass of 500 g and the string is 50 cm long, what is the tension in the string?

The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. assume that the membrane acts like a parallel plate capacitor in which the effective charge density on the inner and outer walls has a magnitude of 7.0 × 10-6 c/m2. (a) what is the magnitude of the electric field within the cell membrane? (b) find the magnitude of the electric force that would be exerted on a potassium ion (k+; charge = +e) placed inside the membrane.

What happens when a rubber rod is rubbed with a piece of fur?

Ivana walks 2km north then turns around and walks 3km south