Recent content by pinkpolkadots

Thanks!

Homework Statement For this set of data find the mean and standard deviation Temp...# of days 90-94...1 85-89...3 80-84...6 75-79...12 70-74...7 65-69...1 2. The attempt at a solution I don't know how to find the mean or standard deviation when the data is divided into...

Can anyone explain to me why the battery life would stay the same?

Thanks so much!

Here is what I have for answers now: Please let me know if I still have the wrong idea. (a) The terminal voltage of the battery decreases as more lightbulbs are added. The terminal voltage of the battery is only equal to its emf when no current is drawn. Also, this voltage is lost over the...

I looked at the sites and found this helpful for part (a): As the number of parallel lamps increases, the terminal voltage drops and the current increases. The terminal voltage of the cell is equal to only its emf when no current is drawn (no lamps attached). Therefore, it seems to me...

(a) Well, I would think that you can't change the terminal voltage of the battery, that is why I said it would stay constant. And for (d) I guess you can't change the the power delivered by the battery either. But, again, I can't explain my answer. (c) A parallel circuit is just like...

Actually, could you say that the brightness of each bulb decreases because the voltage from the battery has to be shared by more bulbs?

I would think that when you turn on another lamp the first one would become dimmer, but I don't know how to explain that in physics terms.

I appreciate any help! If anyone can let me know if my answers are right or help me with this problem, it would be great! Thanks.

Homework Statement You have a large supply of lightbulbs and a single battery. You start with one lightbulb connected to the battery and notice its brightness. You then add one lightbulb at a time, each new lightbulb being added in parallel to the previous lightbulbs. As the lightbulbs...

By the way, would the instantaneous acceleration be directed towards the center of the disk?

Oh, yes! How silly of me. So it would be... EFy = 0 mg = FN and EFx = ma uFN = (mv^2)/r umg ug = (v^2)/r (.5)(9.8) = (v^2)/.14 v = .83 m/s Thank you!

Can anyone help me with this problem? I've tried to do part a, but I don't think I'm doing it right. A coin of mass 0.0050 kg is placed on a horizontal disk at a distance of 0.14 m from the center. The disk rotates at a constant rate in a counterclockwise direction. The coin does not slip...

yes, x was the distance the block falls from the table. thank you!