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Q.Use Stefan's law to calculate the total power radiated per unit area by a tungsten filament at a temperature of 3000 K. (Assume that the filament is an ideal radiator.)

If the tungsten filament of a light bulb is rated at 75 W, what is the surface area of the filament? (Assume that the main energy loss is due to radiation.)

Q. You are swinging your younger sister in a horizontal circle of radius 0.81 m. Her mass is 26 kg and you arrange it so she makes one revolution every 1.5 s.

(a) What is the magnitude and direction of the force that must be exerted by you on her? (Model her as a point particle.)

(b) What is the magnitude and direction of the force she exerts on you?

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