When the piston of a fountain pen with a nib is dipped into ink and the air is relaesed by pressing it the ink fill in the pen. Why?

Your 249 ml cup of coffee is too hot to drink when served at 82 degree celsius. what is the mass of an ice cube taken from a -21 degree celsius freezer, that will cool your coffee to a pleasant 54 degree celsius. specific heat of the water is 4190 j/kg c, specific heat of ice is 2090 j/kg c, heat of fusion of ice is 3.33 x 10^5 j/kg

To create electromagnetic induction, which of the following has to move? a. a wire b. a magnet c. a transformer d. either a or b

How have the competing explanations' experiments on atoms affected the development of the atomic model?