The solar radius is the distance between the core and the outer edge of a star. Betelgeuse, Rigel, and Polaris all have large solar radii. Sirius B, Epsilon Eridani and Barnard’s Star all have small solar radii. What is the relationship between the solar radius and the brightness of stars?

given data:

determine the horse power (h.p) = ?

force applied to move the box(f) = 10 pounds,

box lifted from a distance         (d) = 3 feet

time taken to lift                         (t) = 10 sec,

the horse power is defined as amount of work required to move a load. the horse power is equal to 550 foot-pound per second

                  1 h.p   = 550 foot-pound/second

it can also be defined as the the load that need to be move a body for certain distance in a certain amount of time.

mathematically,

                      h.p = (force × distance)/ time

                            = (10 × 3)/ 10

                            = 30/10

                            = 3 foot -pound/sec

hence, the horse power is needed to move the box is 3 foot-pound/second

important note: 1 h.p = 550 foot-pound/second = 746 watts

3.2x10^7

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.