Cho biết Mặt trăng quay một vòng xung quanh Trái đất mất 27 ngày đêm. Tính vận tốc góc của Mặt trăng.
A. 8,5.106 rad/ s B. 4,2.106 rad/ s C. 2,7.106 rad/ s D. 6,3.106 rad/ s

Which property of fossils allow scientists to determine the relative rock ages..

A30 kg weight lies on top of a massless piston of area a = 0.01 m2 the exterior air is at a (constant) p =1 atm and t = 27 c. the interior gas is 0.4 moles of (ideal) n2 and it has initial temperature 27.00 degrees c. 1. what is the initial pressure in the interior? a. 29.4 kpa b. 130.7 kpa c. 101.3 kpa the next three questions concern what happens when an amount of heat q is slowly added to the interior, raising the piston by 1 mm and raising the interior temperature to 27.40 c

Agas expands from an initial volume of 0.040 m^3 and an initial pressure of 210 kpa to a final volume of 0.065 m^3 while its temperature is kept constant. how much work is done by the system?