During a lunar eclipse, the earth lies directly between the moon and the sun. To an astronaut on the moon, this event is just like a solar eclipse with the earth obscuring the sun: however, the earth is large enough that instead of exactly obscuring the sun it appears 4 times wider. Use this information to estimate the diameter of the earth.

Three charge are arranged as shown in the diagram. the magnitude of the net electrical force acting on the +6 uc charge, rounded to the tenths place, is .

If a tank filled with water contains a block and the height of the water above point a within the block is 0.8 meter, what is the pressure at point a?

Nitrogen (n2) undergoes an internally reversible process from 6 bar, 247°c during which pν1.2 = constant. the initial volume is 0.1 m3 and the work for the process is 121.14 kj. assuming ideal gas behavior, and neglecting kinetic and potential energy effects, determine heat transfer, in kj, and the entropy change, in kj/s. show the process on a t-s diagram.