57.14 A sound wave traveling downward with a speed of about 4,000 m/s suddenly slows to 1,500 m/s not far below the
Earth's surface.
What has the sound wave most likely encountered?
a different kind of rock
O an underground lake
an open cavity
O a pile of dinosaur bones

What occurs during a combustion reaction

An electric clothes dryer has a resistance of 8 ohms. it draws 30 a of current. what is the voltage, in volts, of the wall outlet that it is plugged into?

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.