You need to make a spring scale to measure the mass of objects hung from it. you want each 2.3 cm length along the scale to correspond to a mass difference of 0.10 kg. what should be the value of the spring constant?

42.6 N/m

Explanation:

The spring constant can be found by using Hooke's law:

F = kx

where

F is the force applied

k is the spring constant

x is the stretching/compression of the spring

In this problem, the mass applied is

m = 0.10 kg

so the force applied is the weight of the mass:

The stretching of the spring is

x = 2.3 cm = 0.023 m

So the spring constant is

answer: option c. i.e. electric current flowing “downhill” from the negative electrode to the positive electrode in a battery

explanation:

the water analogy to the circuits define the pipes (water flows) to the electric current. now, we know that the electric current flows from the positive terminal to the circuit (as shown in the diagram attached).

hence, option c is the correct answer.