An airplane traveling at one third the speed of sound (i. e., 114 m/s) emits a sound of
frequency 3.76 kHz.
At what frequency does a stationary listener hear the sound as the plane approaches?
Answer in units of kHz.

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.

Make a drawing of the electric field lines around a positive charge, then make a second drawing of the electric field lines around a negative charge.

5400 j of energy are given off when a 50 g of aluminum pan changes temperature. does the temperature of the pan increase or decrease and by how much