You create a transformer by wrapping wire around an iron nail. the number of turns are: primary (500); secondary (2500). the primary voltage is 3.00 v. the secondary current is 200 ma. this is like examples #14 and #15 (pages 16 & 17) of chapter 21 notes. 13) calculate the secondary voltage (v). 14) calculate the primary current (a).

What can you increase the strength of an electromagnet by

3. a worker pushes a 30.5 kg polished stone along a polished table with a force on bonin a straight line for 5.20 s after starting from rest. there is no friction between thestone and the table. at the end of the table. the stone is hooked to a cable with a lengthof 62.0 cm to rotate it to a rough table to store until they can be picked up. the roughtable has a coefficient of static friction 0.702 with the polished stone. remember that 8= 9.80 m/s2a) what is the speed of the stone when it is hooked to the cable? b) what is the tension in the cable while the stone is rotating? (there is still nofriction)c) how much force is needed to make the stone begin sliding from rest on therough table? ius = 0.70262.0 cm30.5 kg20.5 kg6= 0

Which describes increasing the efficiency of energy resource