A student hangs a weight on a newtonmeter. The energy now stored in the spring in the newtonmeter is 4.5 × 10−2 J The student then increases the weight on the newtonmeter by 2.0 N Calculate the total extension of the spring. Spring constant = 400 N/m

The modern-day generator works on the principle of electromagnetic induction discovered by michael faraday in 1831-32. faraday discovered that the above flow of electric charges could be induced by moving an electrical conductor, such as a wire that contains electric charges, in a magnetic field.

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.