The frequency of a steam train whistle as it approaches you is 552 hz. after it passes you, its frequency is measured as 486 hz. how fast was the train moving (assume constant velocity)?

Along wire of diameter 1 mm is submerged in an oil bath of temperature ∞ 31°c. the wire has an electrical resistance per unit length of 0.01 ω/m. if a current of 103 a flows through the wire and the convection coefficient is 500 w/m2·k, what is the steady-state temperature of the wire? from the time the current is applied, how long does it take for the wire to reach a temperature that is within 1°c of the steady-state value? the properties of the wire are 8000 kg/m3, 500 j/kg·k, and 20 w/m·k.

You have 80 g of 60oc water and 80 g or 10oc water. what is the final temperature when the two are mixed? explain.

Two cans on a sunny window one black and the other white construct and explanation of the effect of sun will have on both cans over a two hour period?