Aman rides in an elevator while standing on a bathroom scale calibrated to read force in newtons. as the elevator starts to move upwards it speeds up with an acceleration of magnitude 2.1 m/s2. the scale displays a force of 844.9 n . what is the man’s mass?

71 Kg

Explanation:

a = 2.1 m/s²

R = 844.9 N  

We can apply Newton's Second Law as follows:

R – W = m*a

R – m*g = m*a  

m*a + m*g = R

m (a + g) = R

m = R / (a + g)

m = (844.9 N) / (2.1 m/s² + 9.81 m/s²) = 71 Kg  

it becomes positively charged by charging it

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.