a 1500 kg car accelerates along a flat track to a speed of 20 m/s. how much does its gravitational potential energy increase over the length of the track?

A30 kg weight lies on top of a massless piston of area a = 0.01 m2 the exterior air is at a (constant) p =1 atm and t = 27 c. the interior gas is 0.4 moles of (ideal) n2 and it has initial temperature 27.00 degrees c. 1. what is the initial pressure in the interior? a. 29.4 kpa b. 130.7 kpa c. 101.3 kpa the next three questions concern what happens when an amount of heat q is slowly added to the interior, raising the piston by 1 mm and raising the interior temperature to 27.40 c

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?