Dan G.

A child asks you very politely why the sky appears blue on a bright and sunny day. What would you say to him or her? They then go on to ask about why the sunset appears red when it normally looks... more

Approximately how many times louder is a 140-dB sound than a 80-dB sound?

A ball is thrown straight upward and returns to the thrower’s hand after 3.7 s in the air. A second ball is thrown at an angle of 45◦ with the horizontal. At what speed must the second ball be... more

a styrofoam ball is attached to the bottom of a swimming pool with a nylon cord.  the cord is 1.20 m long and the pool is 3.3 m.  diameter of ball is 46cm. density of styroforam is 0.3 g/cc. find... more