Which of the following is not a factor that affects the apparent brightness of a star as seen from earth?
a. how old the star is
b. how big the star is
c. how hot the star is
d. how far away the star is

A. how old the star is

Explanation:

The brightness of a star can be determined by what we call an Apparent magnitude. Factors that affect the brightness of a star are:

a. How far away the star is

b. The size of the star or how big a star is

c. How hot the star is.

The brightness of a star or its Apparent magnitude as seen from the Earth can be measured or determined by using a scale from -26.8 to +29.

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards