Recent content by daysrunaway

Homework Statement A light bulb is designed for use in a 120 V circuit. If by mistake it is plugged into a 240 V circuit, what will happen to the power of the light bulb? Explain. Homework Equations I = V/R P = VI The Attempt at a Solution Since I = V/R and the resistance of the...

Homework Statement Suppose that f has a continuous second derivative for all x, and that f(0) = 1, f'(0) = 2, and f''(0) = 0. Does f have an inflection point at x = 0? Homework Equations none The Attempt at a Solution I know that for f'' to have a point of inflection, it needs to...

There's a lot of vocabulary in there that I don't understand (this is a physics 12 course) and I'm still really confused. I'll try to start again at the beginning and ask a slightly different question and see if that gets me anywhere. So if the potentiometer is not hooked up to the simple...

Now I'm even more confused. Mindscrape, do you mean that the resistance of the standard cell is equal to the resistance of the length of wire (48.0 cm x 0.038 ohms/cm) when the potentiometer is balanced? If this were the case, I (= V/R) would be greater in the circuit with less resistance, which...

Homework Statement The attached graphic shows a potentiometer circuit. The uniform wire AB is 100 cm long and has a resistance of 0.038 ohms/cm. The standard cell has an emf of 1.35 V. The galvanometer registers zero when the sliding contact is at L = 48.0 cm. If the sliding contact were moved...

Homework Statement A battery supplies a steady current of 5.6 A for 21 s. During this time 1410 J of chemical energy is transformed into electric energy, but 560 J of this electric energy is transformed into heat energy inside the battery. What is the total power output of the battery...

Homework Statement A certain spherical planet which is not rotating has a radius of 6.36 x 105 m and a mass of 1.89 x 1021 kg. At what minimum speed would a vehicle traveling along its surface just begin to leave the ground? Homework Equations FC = mv2/r FG = GMm/d The Attempt at a...

It's on the sidebar, under "Physical Characteristics".

I don't understand why that is, especially since Wikipedia says it is 451 m/s en.wikipedia.org/wiki/Earth

465.1 m/s

I didn't, though, and that's the source of my confusion. I know I have the right value for v but when I plug it into v^2/r, I get 3.37 x 10^-2 m/s^2. This answer is not equal to the answer I found for the actual acceleration, which is 0.006 m/s^2. My question is why is my answer different from...

No, it isn't.

Thanks for the suggestion RoughRoad but I don't really understand how I am supposed to use this equation. I found that my calculation for the angular velocity (2piR/T) is approximately equal to the wikipedia value for angular velocity, so I really am confused now because I can't see what I'm...

Homework Statement An object orbits the Earth at a constant speed in a circle of radius 6.38 x 106 m, very close to but not touching the Earth's surface. What is its centripetal acceleration? Homework Equations a = v2/r = 4\pi2v/T2 v = 2\pir/T The Attempt at a Solution I plugged in...

Homework Statement A load on which the force of gravity is 46 N hands from the centre of a frictionless clothesline, pulling its centre down so that each half of the line makes an angle of 25° with the horizontal. What is the force of tension in the line?Homework Equations \SigmaY = FT - FG =...