1. Colby runs for at least 45 minutes per day. His average for the week is 52.7 minutes. How many seconds of running did Colby average? Show your work.

Heena wants to measure the volume of a ball that is 24 cm across. how should she set up her equation?

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

Along wire carrying a 4.2 a current perpendicular to the xy-plane intersects the x-axis at x=−1.7cm. a second, parallel wire carrying a 3.0 a current intersects the x-axis at x=+1.7cm. part a at what point on the x-axis is the magnetic field zero if the two currents are in the same direction? express your answer to two significant figures and include the appropriate units.