Aperson drives to the top of a mountain. on the way up, the person’s ears fail to “pop,” or equalize the pressure of the inner ear with the outside atmosphere. the pressure of the atmosphere drops from 1.010 x 10^5 pa at the bottom of the mountain to 0.998 x 10^5 pa at the top. each eardrum has a radius of 0.40 cm. what is the pressure difference between the inner and outer ear at the top of the mountain? a. 1.2 x 10^3 pa b. 1.1 x 10^5 pa c. 1.0 x 10^2 pa d. 1.2 x 10^2 pa

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied.

A23 kg log of wood begins from rest, 300 m up a sluice (a water track used to transport logs, think of it as an inclined plane with negligible friction) inclined at 20° to the horizontal. after it reaches the flat waterway at the bottom it collides elastically with a 100 kg block of wood initially at rest near the base of the incline. (a) how long does it take the 23 kg log to travel down the incline? (b) what is the speed of the 23 kg log at the bottom of the incline? (c) what are the velocities of both blocks of wood after the collision? (d) what is the total kinetic energy before the collision? (e) what is the kinetic energy of the 23 kg log after the collision? (f) what is the kinetic energy of the 100 kg block of wood after the collision? (g) what is the total kinetic energy after the collision? (h) compare the total initial and total final kinetic energies. is this consistent with what you would expect for elastic collisions? explain!

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?