Recent content by KatieLynn

Homework Statement Due to the expense involved, car crash tests often use small samples. When 5 BMW cars are crashed under standard conditions, the repair costs (in dollars) are as shown in accompanying list. Use 0.05 significance level to test the claim that the mean for all BMW cars is...

Homework Statement If there are 4 children in a family, find the probability of getting exactly 3 girls. Find the mean, variance, and standard deviation. Use two different methods(binomial distribution method and general probability distribution method). Homework Equations Binomial...

I typed x instead of i, i just showed one part of the problem, i just want to know if you can just square the whole thing

Homework Statement I'm trying to simplify a summation. I have something that looks like \sum \sqrt{(1/4)(i)} (1/4) Granted I might have made a mistake setting this up which would make my question irrelevant but anyway. Homework Equations there are equations for i, i squared and i cubed The...

Homework Statement A conical tank (with vertex down) is 10 feet across the top and 12 feet deep. If water is flowing into the tank at a rate of 10 cubic feet per minute, find the rate of change of the depth of the water when the water is 8 feet deep. Homework Equations Cone: V= (Ah/3) Right...

yes sorry that was a typo, thanks! :)

Homework Statement The radius r of a sphere is increasing at a rate of 2 inches per minute. Find the rate of chance of the volume when r=6 and r=24 inches. Homework Equations V=(4/3)(pi)(r^3) The Attempt at a Solution This is what I did, I would appreciate it if someone could...

Okay here's what I did using that equation... Vf^2= 0 + 2(9.81)(20m) Vf=19.8m/s then KE=1/2mv^2 so 1/2(.5kg)(19.8m/s)^2 KE=98.1 Correct? Now would B just simply be 0?

what do u and s stand for in that equation?

Homework Statement If a .5kg ball is thrown up in the air and reaches a height of 20 meters. A)What is the ball's Kinetic Energy? B)What is its initial velocity, as it leaves the thrower's hand? C)What is its velocity at 16 meters? Homework Equations KE=1/2mv^2 The Attempt at...

thank you :)

Ohh! I kind of remember him saying something about that now, isn't it like you multiply it by 4 because its 1/4 the of the length of the wave or something? So, anyway, here's what I did... 15.7cm=0.157m 0.157m*4=.628=wavelength v=(550hz)(.628) v=345.4m/s Correct?

mmm I don't think so, I wasn't aware there there was a separate wavelength equation for closed-end tube things. I thought you could use v=wavelength*frequency or velocity= wavelength/T for all of them.

Homework Statement A 15.7cm long, closed-end tube, filled with air, resonates when exposed to sound waves with a frequency of 550hz. Calculate the speed of sound. Homework Equations V=331.4 + 0.6*Temp.C V=wavelength*frequency V=d/t The Attempt at a Solution I'm thinking I...

thank you :)