If you pull on spring with a force of 1.0 N and you cause it to stretch for 5cm.

Question

If you pull on spring with a force of 1.0 N and you cause it to stretch for 5cm. The spring's constant is? For the same spring: the potential energy stored in the spring is? If the stretching of the same spring took 0.1s. the power is If you throw a 200 g apple 3.0 m upward, the work done by gravity approximately is On a level road, the normal force of the road on the tires can cause your car to accelerate The net force on a body that is not accelerating is zero A force does the most work on a mass when parallel to the displacement of the mass

Explanation / Answer

(8) Force F = 1 N

Streachness x= 5 cm = 0.05 m

Spring constant K = F / x

                          = 20 N / m

(9).Potential energy U = ( 1/ 2) k x 2

                                = 0.025 J

(10).Time t = 0.1 s

Power P = U / t

             = 0.25 W

(12).mass m = 200 g = 0.2 kg

Height h = 3 m

Work done W = mgh       where g = acccleration due to gravity = 10 m/ s 2 (approximately)

                   = 0.2 x 10 x 3

                  = 6 J

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