Achild is stationary on a swing. the child is given a push by his brother to start him swinging. his brother applies a steady force of 84 n over a distance of 0.25 m. calculate the work done by this force.

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)

The smallest particle of an element that retains its identity in a chemical reaction. true or false

Identify the arrows that represent the process of cooling..