# Search results

1. ### Direction of friction: deceleration and turning

Hi! :) I'm confused about the direction of the friction vector when we decelerate and when we turn. I've memorized the directions (if I decelerate going east, friction is aimed west; if I am in a flat circle and going around it, friction points to the middle), but they don't exactly make sense...
2. ### Enthalpy equations with pressure/volume assumptions

I'm trying to learn the various equations of enthalpy with certain assumptions, but I couldn't understand where they came from. So, I tried to derive them myself, but now I'm lost beyond reason. I'm getting confused between the various forms of the enthalpy equation, depending on constant...
3. ### Heat engines: how can we yield work?

So, I'm studying for the MCAT. There..I've said it. :) But, it's not a homework question: I just don't understand the concept. My study book's thermodynamics section includes a very rough sketch of a heat engine to describe the 2nd Law of Thermodynamics. A side note in the text says that if...
4. ### Find capacitance from time, power, and voltage

1. Homework Statement A flashlight uses 6.0J in 1.8ms (0.0018 seconds). First question: find the power. Got it: 3333W (3.3E3 with two sig figs, which is the accepted answer in the online system). The real problem: find the capacitance if the flashlight uses 200V. 2. Homework Equations...
5. ### Work = -delta U

1. Homework Statement Work done by conservative forces = -\DeltaU 2. Homework Equations Above. 3. The Attempt at a Solution Here is the whole equation: Wc+ Wnc = \DeltaK. Wnc = \DeltaK + \DeltaU. So, Wc = -\DeltaU. But, for example, how does that apply in a...
6. ### Boron Neutron Capture Therapy (B10->B11)

Hi! I hope I've posted this in the right section, but it definitely deals with the nucleus, so here goes. I'm doing a presentation on Boron Neutron Capture Therapy, which, if you don't know, puts boron inside tumor cells, shines a neutron beam onto those cells, which causes the boron inside...
7. ### Questions about fusion (from a high-schooler)

Hi! I have a major project coming up this next Thursday and am doing it on nuclear fusion used as power source. I've been reading the topic above (Fusion Summary?) and it is quite a read. I'll tell you, most of it is completely over my head, but it is one of the most interesting things I've read...
8. ### Weird question: ideas of a physics' project

Hi! As you can see, I didn't use the template, but that is because this is a different kind of question. I need to think of a project relating to physics for my final project in Honor's Physics. She (the teacher) would like an idea by Monday and the sooner I can start researching, the better...