Ada tiga orang bersahabat. Sebut saja A, B dan C. B menggedong A dan C diam. C melihat B berjalan menjauhinya. Menurut C, A dan B bergerak karena ada perubahan kedudukan
keduanya terhadap C. Sedangkan menurut B, A tidak bergerak. Siapa yang bergerak dan
siapa yang diam?

Agas is contained in a vertical, frictionless piston–cylinder device. the piston has a mass of 3.2 kg and a cross-sectional area of 35 cm2. a compressed spring above the piston exerts a force of 190 n on the piston. if the atmospheric pressure is 95 kpa, determine the pressure inside the cylinder.

In a system, when potential energy decreases, then entropy also decreases. true false

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present