Author Question: You drop a stone down a well. You hear the splash 2.23 s later. How deep is the well? The speed of ... (Read 45 times)

lidoalex · **on:** Jul 29, 2018

You drop a stone down a well. You hear the splash 2.23 s later. How deep is the well? The speed of sound in air is 343 m/s.

A)

6.96 m

B)

20.2 m

C)

22.9 m

D)

18.8 m

E)

20.0 m

Question 2

The objective lens of a refracting telescope has a focal length of 60 cm and the eyepiece a focal length of 8.0 cm. What is the angular magnification of the telescope?

A)

34
B)

480
C)

68
D)

0
E)

7.5