Determine the force that a 75kg man exerts on the floor of an elevator. (a) When it 1.2m/s
(b) When it descends with a constant acceleration of 2m/s2 and
(c) When it ascends with a constant acceleration of 2m/s2​. help me​

What is the rate of 12 liters of water moving through a water hose in 4.0 minutes?

Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.

Ihave this 50 question test the layer of earth's atmosphere where atoms and molecules escape into space is referred to as the a) exosphere b) ionosphere. c) mesosphere d) thermosphere