# 1. Express the following angles in radians: (a) 45.0°, (b) 60.0°, (c) 90.0°, (d) 360.0°, and (e)…

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?