A radiometer has two square vanes (1.0 cm by 1.0 cm), attached to a light horizontal cross arm, and pivoted about a vertical axis through the center, as shown in the figure. The center of each vane is diboth from the axis. One vane is silvered and is perfectly reflecting. The other vandit blaakeros and and pivated aboutna trtice with intensity of 500 W/m is incident perfectly perpendicular to the front of both vanes. 1. Calculate the radiation pressure on the reflecting side. Then, using the fact that Pressure = Force/Area, calculate the total force on the reflecting side. 2. Do the same as part (a) for the absorbing side. 3. Now, recall that torque,, where r is the distance from the axis of rotation. Using your answers to (a) and (b). calculate the total torque on the radiometer. Keep in mind that the two torques will oppose each other because they are on opposite sides of the axis!
A radiometer has two square vanes (1.0 cm by 1.0 cm), attached to a light horizontal cross arm, and pivoted about a vertical axis through the center, as shown in the figure. The center of each vane is diboth from the axis. One vane is silvered and is perfectly reflecting. The other vandit blaakeros and and pivated aboutna trtice with intensity of 500 W/m is incident perfectly perpendicular to the front of both vanes.
1. Calculate the radiation pressure on the reflecting side. Then, using the fact that Pressure = Force/Area, calculate the total force on the reflecting side.
2. Do the same as part (a) for the absorbing side.
3. Now, recall that torque,, where r is the distance from the axis of rotation. Using your answers to (a) and (b). calculate the total torque on the radiometer. Keep in mind that the two torques will oppose each other because they are on opposite sides of the axis!
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