How does changing the threads on a screw affect the force and distance required to perform work?

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?

Amira pulls a 3 pound wagon 4 feet. how much work has she done?

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 = 2.6 m below the tank bottom which is a = 6.7 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). report your answer in meters to two decimal places.