1. Express the following angles in radians:
(a) 45.0°, (b) 60.0°, (c) 90.0°, (d) 360.0°, and (e) 445°. Give as numerical
values and as fractions of .
2. The Sun subtends
an angle of about 0.5° to us on Earth, 150 million km away. Estimate the radius
of the Sun.
3. A laser beam is directed at the Moon,
380,000 km from Earth. The beam diverges at an angle (Fig. 10-44) of
1.4X 10-5 rad. What diameter spot will it make on the Moon?