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Questions in physics

[Done] An earthquake has just occurred. Seismic waves from the earthquake are detected at two recording stations. At Recording Station $A$, $\Delta T=45 s$. At Recording Station $B$, $\Delta T=100 s$. Which recording station is farther away from the epicenter? A. $A$ is farther from the epicenter than $B$. B. $B$ is farther from the epicenter than $A$. C. $A$ and $B$ are the same distance from the epicenter. D. Cannot be determined.

[Done] A 6.33 C charge is attracted by a force of 0.115 N to a second charge that is 1.44 m away. What is the value of the second charge? Include the + or - sign.

[Done] Using Kirchhoff's rule, calculate the current through the 40Ω and 20Ω resistors in the following circuit: A-----20Ω-----B | | 80V 40Ω C | | D-------------F | | E-----10Ω-----F 40V

[Done] Define and calculate momentum. Explain how momentum is a product of mass. Apply Newton's laws to momentum.

[Done] Scientists know that the moon does not have a magnetic field. This probably means that the moon does not have: A. mountains B. movement in its core C. life D. an atmosphere

[Done] Calculate the frequency of the wavelength having a wavelength of [tex]$631 \times 10^{-8}$[/tex]. Calculate the wavelength of the first two lengths of the Balmer series. Calculate the wavelength of the Lyman series.

[Done] The vector quantity is: a) Power b) Work c) Momentum d) Electrostatic potential

[Done] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Done] Find two mirrors and hold them upright on a table so they are at an angle to each other like an open book. Set an object between them and look in the mirrors. a) How many images do you see?

[Done] Berrice is calculating the density of cookies in a tin. She knows the number of cookies in the tin and the volume of the tin. Which of the following formulas can be used to calculate the density of cookies in the tin? A. [tex]$\text { Density }=\frac{\text { volume of tin }}{\text { number of cookies }}$[/tex] B. [tex]$\text { Volume of shelf }=\frac{\text { density }}{\text { number of cookies }}$[/tex] C. [tex]$\text { Number of books }=\frac{\text { density }}{\text { volume of tin }}$[/tex] D. [tex]$\text { Density }=\frac{\text { number of cookjes }}{\text { volume of tin }}$[/tex]