Apiston above a liquid in a closed container has an area of 1m2. the piston carries a load of 350 kg. what will be the external pressure on the upper surface of the liquid?

a. 27.3 kpa
b. 3.43 kpa
c. 4.90 kpa
d. 68.6 kpa

The frequency of a tuning fork can be found by the method shown. a long tube open at both ends is submerged in a beaker of water, and the vibrating tuning fork is placed near the top of the tube. the length l of the air column is adjusted by moving the tube vertically. the sound waves generated by the fork are reinforced when the length of the air column corresponds to one of the resonant frequencies of the tube. the smallest value for l for which a peak occurs in sound intensity is 7 cm. l what is the frequency of the tuning fork? the speed of sound in air is 345 m/s. answer in units of hz

You add 10 drops of hot water to the cold water in a clear beaker without stirring. after a short time, the water is warm throughout. which law of thermodynamics explains the change in temperature? third law second law first law

The velocity of a car traveling in a straight line increases from 0 meters/second to 30 meters/second in 8 seconds. what is the average acceleration of the car? a. 3.75 meters/second b. 3.75 meters/second2 c. 0.27 meters/second2 d. 0.27 meters/second