Atransistor with a height of 0.4 cm and a diameter of 0.6 cm is mounted on a circuit board. the transistor is cooled by air flowing over it with an average heat transfer coefficient of 30 w/m2-°c. if the air temperature is 55 °c and the transistor case temperature is not to exceed 70 °c, determine the amount of power this transistor can dissipate safely. disregard any heat transfer from the transistor base.

The magnitude of the poynting vector of a planar electromagnetic wave has an average value of 0.939 w/m^2 . the wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. how much total electromagnetic energy falls on the area during 1.0 minute?

What is the mass of the water that is being heated? it requires 2,500 joules to raise a certain amount of water (c = 4.186 jig c) from 20.0°c to 60.0°c. o 159 o 40 g o 63 g o 80 g

Adisk with a radius of r is oriented with its normal unit vector at an angle q with respect to a uniform electric field. which of the following would result in an increase in the electric flux through the disk? check all that apply? a. increasing the area of the disk b. decreasing the given orientation angle of the disk c. decreasing the strength of the electric field d. increasing the given orientation angle of the disk, but not exceeding an angle of 90