Which of the following statements is true? a. the angle of refracted light is equal and opposite to the angle of incoming light. b. a magnetic field can be created by running an electric current through a magnet. c. exothermic chemical reactions absorb heat. d. velocity and temperature are scalar quantities.

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.

Aheavy piece of hanging sculpture is suspended by a90-cm-long, 5.0 g steel wire. when the wind blows hard, the wire hums at its fundamental frequency of 80hz. what is the mass of the sculpture?

I’ve been stuck on this for a while