Aball is dropped from rest from a tower and strikes the ground 125meters below. approximately how many seconds does it take for the ball to strike the ground after being dropped? neglect air resistance.

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.

In the first law of thermodynamics, triangle e=q-w, what does q stand for

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?