What would happen if the distance between the earth and the moon decreased

Using the given data table, calculate the acceleration of the skateboarder. you can use either form of the equation below?

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.

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.