A force of 10 N causes a spring to extend by 20 mm. Find: a) the spring constant of the spring in N/m

b) the extension of the spring when 25 N is applied

c) the force applied that causes an extension of 5 mm.​

Which graph best represents the relationship between the electric current and the rate at which a magnet is turning inside an electric generator?

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s

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