A sound system is designed to produce a 1.0W/m2 sound intensity over the surface of a hemisphere 20 m in radius. What acoustic power is needed from an array of speakers at the center of the sphere?

Hurricanes are especially destructive because of the abrupt decrease in air pressure that they bring with the winds. Consider a house which is airtight, and has a pressure of 1.02 atm when a hurricane hits.

What is a pattern of motion in the solar system

A light wave is shone on a glass block. At the boundary between air and glass, which wave phenomena can been demonstrated? A) You can demonstrate reflection off the glass. B) You can demonstrate refraction as it enters the glass.

Compare the outermost electrons of an atom with the inner most electrons of an atom in terms of energy

You and a friend each drive 53 km to the same destination. You travel at 88.8 km/h and your friend at 92.6 km/h. How long will your friend wait for you at the end of the trip?

A new object has been discovered in the solar system. In your own words, justify how the object can be proved to be a comet.

What is cosmic microwave background radiation?

Ocean water has a salinity of 35 parts per thousand. Fresh water has a salinity of less than 0.5 parts per thousand. What can you conclude from this information? A. Ocean water is rich in salt minerals. B.

You decide to add up all the work you did yesterday. If you accomplished 10,000 newton·meters of work yesterday, how much work did you do in units of joules?

What causes day and night on earth?