You hear a sound coming from a speaker 60m away at 90 dB. The speaker is producing
how many
Watts of sound power. Round to the nearest ones place.

An owl dives toward the ground with a constant velocity of 4.40 m/s at 53.0° below the horizontal. the sun is directly overhead and casts a shadow of the owl directly below it. what is the speed (in m/s) of its shadow on level ground?

Why is a noble gas different from other elements

When doing scientific research ,the sources used should be ?