2. An egg sits on top of a desk. If 30 J of work is required to stop the egg from falling at a rate of
40 m/s, what is the mass of the egg?

Abookcase has a mass of 38 kg and the coefficient of friction between it and the floor is 0.82 what is the maximum force of friction between the bookcase and the floor a 372n b 305n c 412n d 449n

Nacidified solution was electrolyzed using copper electrodes. a constant current of 1.18 a caused the anode to lose 0.584 g after 1.52 ✕ 103 s. given that the charge of an electron is 1.6022 ✕ 10−19 c, calculate avogadro's number. assume that copper is oxidized to cu2+ ions.

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