A 10.1 m long, 0.0023 m radius copper wire is stretched between two poles. By landing at the center point of the wire, a bird sends a small pulse out in both directions. The pulses reflect at the ends and arrive back at the birds’ location 2.2 seconds after it landed. Determine the tension (in Newtons) in the wire.
We take the density of copper as 8900 Kg/m3

More solar radiation is absorbed by earth’s surface than by

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.

In one or two sentences, describe how you did in the balancing game. in a few more sentences, explain one strategy you learned for balancing more complex equations.