the image of an object placed 10cm from a convex lens is formed from the lens. by graphical construction, find the focal length of the lens.​

Afixed electric space heater wired by a cable with an ampacity of 30 a should draw a maximum current of a. 30 a. b. 24 a. c. 15 a. d. 27 a.

Explain why electric current cannot exist if a current doesn't have a voltage source.

If the spring constant k of a pogo stick is 3500 n m and the weight of the person on the pogo stick is 700 n, how much is the spring in the botom of the pogo stick compressed?