A0.66-kg block is hung from and stretches a spring that is attached to the ceiling. a second block is attached to the first one, and the amount that the spring stretches from its unstrained length increases by a factor of 7. what is the mass of the second block?

So the mass of second block will be 3.96 kg

Explanation:

We have given mass of the block m = 0.66 kg

The spring is stanched by the factor 7

From hook's law we know that mg = kx

So

Let the mass of second block is M

So

Putting the value of m = 0.66 and  

So the mass of second block will be 3.96 kg

weather forecasts are done by collecting data about the current state of the atmosphere mainly the temperature, humidity and wind and using meteorology, to determine the atmosphere that evolves over time. the h and l mean the high and low pressure. the red strip is a warm front. the blue strip is a cold front. the blue and red strip is a stationary front. the purple strip is a occluded front.

explanation:

e) none of the above answers are correct