A copper wire that is 1 mm thick and 30 cm long is connected to a 1 V battery. (The resistivity of copper is 1.69 x 10-8 Ω⋅m.)Find the current in the wire in [A] assuming it's at room temperature. What is the power in [W] dissipated in the wire at room temperature?

Trumpeter a holds a b-flat note on the trumpet for a long time. person c is running towards the trumpeter at a constant velocity. person b is running away from the trumpeter at the same rate. person d is standing still the whole time. which person hears a frequency that is lower than the b-flat?

Arrange the images in order to show how lake-effect snow occurs.

Does heating a metal wire increase or decrease its electrical resistance? why?