Aspring has a natural length of 28 cm. if a 27-n force is required to keep it stretched to a length of 32 cm, how much work w is required to stretch it from 28 cm to 30 cm? (round your answer to two decimal places.) w = 13.5 incorrect: your answer is incorrect. j

0.14 J

Explanation:

Use the force to calculate the spring constant.

F = k Δx

27 N = k (0.32 m − 0.28 m)

k = 675 N/m

Work is the change in energy:

W = PE

W = ½ k (Δx)²

W = ½ (675 N/m) (0.30 m − 0.28 m)²

W = 0.135 Nm

W = 0.135 J

Rounding to two decimal places, W = 0.14 J.

Your answer was correct, but it was in units of Ncm, and you needed to answer in units of J.

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length

this is a good question! i'll do some research and come back when i have the answer!