An object is placed at a distance 30cm from a thin lenses of power 4 diaptor. Discuss the nature of image

Haley rubs a cotton cloth along a plastic strip. the plastic strip becomes positively charged. why did this happen? a. the plastic strip gained protons from the cotton. b. the plastic strip lost protons to the cotton. c. the plastic strip gained electrons from the cotton. d. the plastic strip lost electrons to the cotton.

What is the relationship between the wavelength of a wave and it's energy?

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?