What is the resultant sound level when an 82-dB sound and an 87-dB sound are heard

Conceptual Physics 12
Problem 27E When you double the charge on both particles in a pair, what effect does this have on the force between them? Does it depend on the sign of the charge?

Physics: Principles with Applications 6
5. (I) A 12.0-cm-diamcter loop of wire is initially oriented perpendicular to a 1.5-T magnetic field. The loop is rotated so that its plane is parallel to the field direction in 0.20 s. What is the average induced emf in the loop?

Probability and Statistics for Engineering and the Sciences 9
Problem 32E Fire load (MJ/m2)is the heat energy that could be released per square meter of floor area by combustion of contents and the structure itself. The article Fire Loads in Office Buildings (J. of Structural Engr., 1997: 365368) gave the following cumulative percentages (read from a graph) f

OpenIntro Statistics 3
A survey of 55 Duke University students asked about their GPA, number of hours they study at night, number of nights they go out, and their gender. Summary output of the regression model is shown below. Note that male is coded as 1. (a) Calculate a 95% confidence interval for the coefficient of

Biology 8
How would the appearance of protobionts ha\'e represented a key step in the origin oflife?

Campbell Biology 10
Which of the following statements is a correct distinction between autotrophs and heterotrophs? a. Autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic. b. Only heterotrophs require chemical compounds from the environment. c. Cellular resp

Chemistry: A Molecular Approach 3
Explain why CO2 and CCl4 are both nonpolar even though they contain polar bonds.

Chemistry 13
Calculate the molar concentration of oxygen in water at \(25^{\circ}\text{C}\) for a partial pressure of 0.22 atm. The Henrys law constant for oxygen is \(1.3 10^{?3} mol/L \cdot atm\).