When a large star becomes a supernova, its core may be compressed so tightly that it becomes a neutron star, with a radius of about 20 km (about the size of the San Francisco area). If a neutron star rotates once every second, what is the speed of a particle on the star's equator?

Speed,

Explanation:

Given that,

Radius of the neutron stare, R = 20 km = 20,000 m

Time taken by the Neutron star to rotate, t = 1 s

We need to find the speed of a particle on the star's equator. The total distance covered divided by total time taken is called speed of an object. Here,

v = 125663.70 m/s

or

So, the speed of a particle on the star's equator is . Hence, this is the required solution.

a) electrical > light, sound, and thermal< < < <

) the mechanical energy of the firefighter moving.< < < < a) electrical > light, sound, and thermal< < < <

c) both a and b.