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You detect a sound level of 97 dB when you are 3m from a sound source.
a) Calculate the power of the source. Assume it emits sound in all directions uniformly.
b) How far do you need to be from the source so that you can barely hear any sound?
c) How much energy goes into your ear in 4 seconds when you are 2 m from the source? Assume that the radius of the opening into your ear is 0.4 cm.
Final temperature after urea dissolves in water, What is the final temperature of the solution in kJ? The density of water is 4.18 J/g·°C. What is the final temperature in °F? F = °C x 1.8 + 32 (Round your answer to one decimal place)
Solve an equilibrium problem (using an ICE table) to calculate the pH of each of the following solutions. .14 M CH3NH2
When using 95% ethanol, the rf value for methylene blue was a lot larger than the rf value for fluorescine. Why does this happen
The accompanying diagram shows how entropy varies with temperature for a substance that is a gas at the highest temperature shown. What processes correspond to the entropy increases along the vertical lines labeled 1 and 2?
How much energy is released from the complete combustion of 63.0 g of sulfur in this equation:
If human height were quantized in one-foot increments, what would happen to the height of a child as she grows up
question nitrogen and hydrogen gases react to form ammonia gas. n2g 3 h2g 2 nh3g at a certain temperature and pressure
Question- It takes 52.0J to raise the temperature of an 8.60g piece of unknown metal from 13.0 C to 24.0 C. What is the specific heat for the metal
If 4.10 g of CaCO are actually produced, determine the percentage error.
Which of the following has the substances arranged from lowest boiling point to highest A. NaCl, C2H6, C4H10, H2O B. NaCl, H2O, C2H6, C4H10 C. C2H6, C4H10, H2O, NaCl D. C2H6, C4H10, NaCl, H2O
A student weighs out exactly 0.250 g CaCO3 (formula weight 100.09 g/mole) and then dissolves this in exactly 250 mL of water. Calculate the Ca concentration of this solution in mg/mL and in M
secondary alkyl halides can undergo substitution by sn1 or sn2mechanisms. explain why the sn2 mechanism is more favored
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