Recent content by grantaere

Okay, so I tried drawing the second circuit (with switches closed) and found that R3 becomes zero since it's in parallel with a wire (assuming this is true?). In this case, I tried making the new total voltage = 11 = IR(2) + IR(unknown + 1 in parallel). Since it says the current remains the same...

Homework Statement Picture provided. The current going through the resistor R1 in the figure does not change whether the two switches S1 and S2 are both open or both closed. The resistances are R1 = 14.00 Ω, R2 = 142.00 Ω, and R3 = 24.00 Ω. The voltage is V = 11 V. With this information, what...

I just went and watched the commercial and I see that yeah, water does react quite strongly with the antacid tablet. I'm still not understanding the reaction going on here there, though- does calcium carbonate react spontaneously with water to form CO2? (I was under the impression that it's...

Homework Statement For a chemistry lab, we're trying to find the amount of CaCO3 in an antacid table by measuring the change in pressure due to the reaction of CaCO3 with HCl to produce CO2. This question in the lab report is confusing me to no end... Let’s say the % concentrations of CaCO3...

Homework Statement Find the Electrostatic potential energy of a cubical configuration of point charges. (One charge on each corner of a cube). Each of the charges is 3.00e and the edge of the cube is 3 cm. Homework Equations U = kqQ/r The Attempt at a Solution I'm pretty sure I understand...

Oh, I got the answer now. I forgot that the calculation for potential difference only involves the charge acting on the proton, and doesn't involve the charge of the proton itself. Thanks for your help!

So then I should use F=fqQ/r^2 to find the force between the two charges when they meet? I did that (and got 6.71E-13N) -- so then I can find the acceleration, but I'm still not sure how value this would be used to calculate voltage?

Homework Statement An unknown element has a nucleus with charge 14.00 e and a radius of about 3.60×10-15 m. How much voltage must be used to accelerate a proton (radius 1.20×10-15 m) so that is has sufficient energy to just penetrate the unknown element? Assume that the potential is that for...

Homework Statement As you stand by a railroad track a train passes with its whistle blowing. As it passes, you hear a frequency shift equal to 21 % of the frequency of the whistle. How fast is the train moving. Express your answer in km/hr.(Speed of sound is 331.4 m/s) Homework Equations f’ = f...

Ahh, I see now- so I don't need to multiply by two because if she stands behind one light, the other is only 1.87m away. Thank you so much!

I assumed she's between the two, since it doesn't specify... would where she is change the answer??

Wouldn't the distance to the car be a line that forms a right triangle?

Homework Statement A child is standing at the edge of a straight highway watching her grandparents' car driving away at a constant 22.4 m/s. The air is perfectly clear and steady, and after 8.3 minutes the car's two taillights (654 nm) appear to merge into one. Assuming the diameter of the...

I've figured it out now, thank you all so much for the help! :)

Homework Statement Gayle runs at a speed of 4.20m/s and dives on a sled, which is initially at rest on the top of a frictionless snow-covered hill. After she has descended a vertical distance of 4.77m, her brother, who is initially at rest, hops on her back and together they continue down the...