You want to reduce your energy bills. A.) calculate the power of a light bulb that transfers 6000J every minute.
B.) calculates the power of a different bulb which has a current of 0.05 A through it when there is a potential difference of 240 V through it.
C.) both bulbs are equally bright. Indicate and explain which bulb you should use.

Asolid round steel rod 6.25 mm in diameter and 375 mm long is rigidly bonded to the end of solid square brass rod 25 mm on a side and 300 mm long. the geometric axes of the bare are along the same line. an axial tensile force of 5.4 kn is applied at the extreme ends of the assembly. for steel e = 200 gpa and for brass e = 90 gpa. determine the total elongation for the assembly.