Homework Help: Physics Help!!

Posted by Sam on Monday, October 18, 2010 at 7:57pm.

A laser beam is directed at the Moon, 380,000 km from Earth. The beam diverges at an angle of 6.2×10−5 rad. What diameter spot will it make on the Moon?
Express your answer using two significant figures.

Physics Help!! - bobpursley, Monday, October 18, 2010 at 8:00pm
diameter= angle*distance= 6.2E-5*380000km=23km check that.
Physics Help!! - Sam, Monday, October 18, 2010 at 8:10pm
Initially I got 2356000 and I made that 2.4 x 10^6 because they wanted two significant figures but that was incorrect. I tried your answer and that is also not right. What am I doing wrong here? Please helP!
Physics Help!! - Damon, Monday, October 18, 2010 at 8:42pm
23.6 km or 23,600 meters looks right to me.

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