Two mirrors make an angle ? with each other. A light ray is incident on the first mirror at an angle of incidence ?. The reflected ray hits the second mirror at an angle of incidence ?. In terms of ? and ?, what is ??
1. ? – ?
2. ? – ?
3. ?/2 – ? + ?
4. ? – ? – ?
1
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Each of two parallel wires separated by 8.0 mm carries a 20-A current. These two currents are oppositely directed. Determine the magnitude of the magnetic field at a point that is 5.0 mm from each of the wires
a. 2.0 mT b. 1.6 mT c. 1.3 mT d. 1.8 mT e. 1.0 mT
Air at 20ºC moves over a horizontal roof at 20 cm/s. The roof is 40 m by 40 m and its temperature is 30ºC. Estimate the heat transfer by convection.
What will be an ideal response?
Which of the following is NOT evidence of the existence of an interstellar medium?
a. extinction of light from distant stars b. very narrow calcium absorption lines in the spectra of O and B stars c. reddening of more distant stars d. dark cloud silhouetted against background stars e. molecular absorption lines in the spectra of cool stars