Why are the eggs and confectioner’s sugar amounts easy to work with to make 8 brownies?

In the first law of thermodynamics, triangle e=q-w, what does q stand for

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

Water is siphoned from a large tank and discharges into the atmosphere through a 50-mm diameter tube. the end of the tube is b = 2.1 m below the tank bottom which is a = 7.4 m deep, and viscous effects are negligible. determine the maximum height h over which the water can be siphoned without cavitation occurring. atmospheric pressure is 101.4 kpa, and the water vapor pressure is 1.79 kpa (absolute)