The tungsten filament of a light bulb has an operating temperature of about 2 100 k. if the emitting area of the filament is 1.0 cm2, and its emissivity is 0.68, what is the power output of the light bulb? (σ = 5.67 × 10−8w/m2⋅k4)
a. 100 wb. 75 wc. 60 wd. 40 w

The desk has a weight of 75 lb and a center of gravity at g. determine the initial acceleration of a desk when the man applies enough force f to overcome the static friction at a and b. also, find the vertical reactions on each of the two legs at a and at b. the coefficients of static and kinetic friction at a and b are ms = 0.5 and mk = 0.2, respectively

The field between two charged parallel plates is kept constant. if the two plates are brought closer together, the potential difference between the two plates either a) decrease b) does not change c) increase?

Calculate the volume of this regular solid. what is the volume of the cone? round your answer to the nearest hundredth