Two streams merge to form a river. One stream has a width of 8.5 m, depth of 3.8 m, and current speed of 2.3 m/s. The other stream is 6.7 m wide and 3.6 m deep, and flows at 2.4 m/s. If the river has width 10.7 m and speed 2.8 m/s, what is its depth?

Two friends are having a conversation. anna says a satellite in orbit is in freefall because the satellite keeps falling toward earth. tom says a satellite in orbit is not in freefall because the acceleration due to gravity is not 9.80 m/2 . who do you agree with and why?

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.

What kind of simple machine is a catapult?