Any device that makes work easier s called a

As you travel up into the mountains, why do your ears pop

What will occur if the steepness of an inclined plane is decreased?

The speed of sound in sea water is about 1530 m/s. If a sound wave has a frequency of 2.50 x 10^2 Hz, what is its wavelength in sea water

Give an example of when two different species might can compete over the same prey

A 60-kg woman in an elevator is accelerating upward at a rate of 1.2 m/s2. a. what is the net force acting upon the woman? b. what is the gravitational force acting upon the woman? c. what is the normal force pushing upward on the woman's feet?

Show that the Newton has the units of mass times acceleration.

Light travels at 150000000km from the sun to earth in 8 minutes. What speed is this in Km/s

Electricity problem (coulomb's law)

An observer (O) spots a plane (P) taking off from a local airport and flying at a 29° angle horizontal to her line of sight and located directly above a tower (T). The observer also notices a bird (B) circling directly above her.

In order for convection to occur, you must have