Methane needs to be liquefied under atmospheric pressure, what is the required temperature

Determine the amount of work done when a crane lifts a 100-n block form 2m above the ground to 6m above the ground

The a metal retainer that keeps the rolling elements evenly spaced. n a. seal n b. separator n c. bearing n d outer race

25pts the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?