A person standing a certain distance from an airplane with four equally noisy jet engines is experiencing a sound level of 143 dB . Part A What sound level would this person experience if the captain shut down all but one engine? [Hint: Add intensities, not dB's.]

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.

1kg of water needs to recieve 4200j of energy to go from 90 degrees to 91 degrees. what is the specific heat capacity of water? what are the units?

To a of 4 x hz is 1. 0. mm nm nm