Two workers use a ramp to help lift a box onto a dock as shown below. Use the diagram below to answer the following question. Despite the advantage gained by using the ramp, there is a loss of energy mainly due to... A. friction between the box and the ramp

B. the length of the ramp

C. The rope stretching when its pulled

D. Two people pulling the rope

Aspring with an unstrained length of 0.071 m and a spring constant of 2.6 n/m hangs vertically downward from the ceiling. a uniform electric field directed vertically upward fills the region containing the spring. a sphere with a mass of 5.29 10-3 kg and a net charge of +7.2 µc is attached to the lower end of the spring. the spring is released slowly, until it reaches equilibrium. the equilibrium length of the spring is 0.058 m. what is the magnitude of the external electric field?