If the body with a mass of 4kg is moved by a force of 20 N, what is the rate of its acceleration?

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)

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

Which type of energy would have nothing to do with ironing clothes? a. heat b. chemical c. electrical d. mechanical