A force of 5 N stretches an elastic band at room temperature. The rate at which its entropy changes as it stretches is about: J/km

16.7 J/km

Explanation:

Given that,

Force acting on an elastic band = 5 N

We need to find the rate at which its entropy changes as it stretches.

The relation between the force and the change in entropy per unit length is given by :

...(1)

Where

T is temperature

For room temperature, T = 298 K

dS/dl is the change in entropy

Put values in equation (1).

Hence, the required rate at which its entropy changes is 16.7 J/km.

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.