You decide to actually levitate the sphere using two oppositely charged plates to create the uniform electric field. If you have the plates close together compared to their size, what charge density do they need to have in nC/m2 to create the field

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

Avalue that describes how heavy an object is and is related to the force of gravity is

A-of 75 cm by cm by 17.5 cm up. of is 2 kg a , in ,if it is in , kg/?