physics
the frequency of middle C on a piano is 261.6hz. What is the wavelength of sound as it travels @room air and in water?
physics
what frequency of sound travels in air @20 degree C has a wavelength equal to 1.7m?
physics
In the past, ships often carried small cannons that wer used when approaching shore in a dense fog to estimate the distance to the hidden land. How would this work?
physics
how to calculate the speed of sound at temp of -83F and 135F?
Chemistry
How do you do this problem? Calcuate the mass of CuCl2*5H2O required for preparing 400mL solution that of .25M in chloride ions.
history
As ratified in 1870, the _______ Amendment prohibited any state from denying the vote to any male citizen on account of race, color, or previous condition of servitude. A. Thirteenth B. Sixteenth C. Fifteenth D. Fourteenth
history
In the Battle of _______, a disastrous charge against forces holding Cemetery Ridge led to Confederate defeat A. Cold Harbor B. Vicksburg C. Antietam D. Gettysburg
american history
Which of the following nineteenth-century inventors is associated with Menlo Park in New Jersey? A. Cyrus W. Field B. Thomas Alva Edison C. Alexander Graham Bell D. Gustavus F. Swift
college physics
By immersing a crown in water its volume is 26inc^3=4.2x10^-4m^3. what would its weight be if it were pure gold? What would its weight be if its volume were half gold and half lead?
physics
the mass density of a mixture of ethyl alcohol and water is 950kg/m^3. is the mixture mostly water, alcohol, or about half and half. What is your reasoning?
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