A 1.0-m length of nichrome wire has a radius of 0.50 mm and a resistivity of 1.0 x 10^-6 O * m. If the wire carries a current of 0.50 A, what is the voltage across the wire?

You hang a book bag on a spring scale and place the bag on a platform scale so that the platform scale reads 23.7n and the spring scale reads 13.8n. what is the magnitude of the force that earth exerts on the bag?