Recent content by Alloymouse

Hi Sam, welcome to PF! It seems that there's a possibility that the dimmer switch you got might not exactly work as advertised... my recommendation is to get a better dimmer switch or some sort of variable resistor that can handle higher currents and with better heat dissipation. The battery...

This: I presume you know how KE and GPE are computed (1/2 mv^2, mgh)? From there you should be able to do some quick algebra and swap the variables around to get KE/m = -g For uncertainty, I believe you might find googling "fractional uncertainties" and "how to calculate uncertainty in an...

Perhaps the OP could consider using the power equations instead of just Ohm's Law. Also, a sanity check would be that the current flowing through wires is really small, so as to minimise power losses such as by Joule Heating.

Consider this: The centre of mass is typically below the halfway point of the height, since the base occupies a larger volume (and this object is of uniform density). I can't recall that generic number we use to find the height of the CM relative to the height of a uniform-density (and I am...

Ah okay For your lab report i think you need to use mathematical formulae to prove that first, then say it is supported by your data Consider using: Loss in GPE = gain in KE

Hi, welcome to PF! From what I can see, your data and graphs plotted have indeed shown that KE/M is -g, so I'm not sure what you are asking for exactly. Are you asking for mathematical proof?

Yes, this is correct, and hence question (a) is answered :) This shows that if you wait for the stuff to be dropped directly above, the supplies will land 220m away from the campsite

try plotting e^x and ln(x) on the same axes, and draw the line y=x. You should be able to understand :) Again, solve for x (make x the subject of the formula). This way of finding inverse is generally applicable to most equations you will encounter at this time.

Yep, it appears to be that when those balls were first made it was to allow more complex movements of the ball in play - but I guess nowadays tennis ball manufacturers added a bit more consideration for speed ranges in modern-day tennis balls: kinda like how different shuttlecocks are rated on...

Considering stuff is kinda weird here... I suggest you either look at the answer key if you have one to find out what they're trying to say, or follow @haruspex advice. Alternatively, you might want to do other similar questions instead.

Okay so I wasn't mad to think the 700N was off phew @Richie Smash Where did you get this question? Do you have a source?

The question did specify cubic feet per minute though

Ah, understood. Hmmm can't find anything else that might cause and error. Have you used your formulae to work things out? If so, what is the correct answer?

Yep, that is right :)

By "heat capacity" am I right to assume you are using "specific heat capacity"? I'm assuming you're right with the constants - imperial units are pretty alien to me hahaha Also, in your very last step (funding flow rate), I think the "error" came about when you divided by (time*60) - there...