here,
the distance from the heat lamp , r = 130 m
the current drawn , I = 15 A
the voltage , V = 120 V
time taken , t = 2 min = 120 s
the total area of face , A = 0.028 m^2
the energy incidented , E = P * t
E = (intesity * ARea ) * t
E = (power dissipated by heat lamp /(4*pi*r^2)) * A * t
E = (V * I * A * t)/(4*pi*r^2)
E = (120 * 15 * 0.028 * 120)/(4*pi*130^2) J
E = 2.85 * 10^-2 J
Check my Required information You are standing 1.30 m from a heat lamp that draws an...
Note: This test contains ten questions from chapter 19 to chapter 27. For full credit, you should show all the steps of your numerical answers. No credit would be earned for just circling the right answers. Chapter 19 - Electric Potential and Electric Potential Energy 1. Two point charges are of + 7 uC and - 4 C are held at the corners of a rectangle as shown. The lengths of the sides of rectangle are 0.15 m, and 0.05...