如图8-9所示,将边长为5 cm 的实心正方体木块轻轻放入装满水的浴
从怀中溢出水的质量为0.1 kg(g取 10 N/kg)。求:
(1)木块受到的浮力。
(2)木块的密度。
(3)木块下表面受到水的压强。

Why did ptolemy have to introduce multiple circles of motion for the planets instead of a single, simple circle to represent the planetâs motion around the sun?

"an open tank has the shape of a right circular cone. the tank is 6 feet across the top and 5 feet high. how much work is done in emptying the tank by pumping the water over the top edge? note: the density of water is 62.4 lbs per cubic foot."

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final