# FizziksGuy

2,763

48

1. ## Rolling without Slipping

It depends where on the object that force is being applied.
2. ## Ap physics two essentials

It depends on where you set your reference angle for theta -- I'd defined mine from a perpendicular perspective. You could also have cosine instead depending upon your starting point.
3. ## Ok then, Ap physics 2 essentials

Checked: A) B=D, C, A, E; D, B=C, A=E There is a typo in an early edition of the book
4. ## Ap physics 2 essentials

Once the lid pops off, there's no longer a pressure differential holding the lid. Therefore you have 800N up, and 4 N down, for a net of 796 N up.
5. ## Dropping a gun

It's actually pretty cool to learn about all the safety mechanisms working inside... I took a class where we spent about an hour looking at all the engineering that goes into a standard Glock (chosen because they're very reliable and simple) -- and it really gives you an appreciation for the level of detail and creativity that goes into strong design.
6. ## AP physics 2 essentials

This is a right hand rule question. You'll have to think in three dimensions. As current flows through the wire to the right, a magnetic field is created which travels around the wire. Above the wire (in the air above the book if you're looking at it on paper), the direction of this field is toward the bottom of the page. Below the wire (down into the book if you're looking at it on paper), the direction is toward the top of the page. This relates back to the section on Fields due to Current-Carrying Wires on pages 173-174.
7. ## AP physics 2 essentials

To think about this one, recognize there are free charges in the wire (sea of electrons, it's a conductor.) Those charges are moving in a magnetic field. Moving charges in a magnetic field experience a force, which will manifest itself in terms of an electric potential difference.
8. ## PaVG #16: Zelda and the Song of Storms Paradox

Lots of wibbly wobbly timey wimey stuff here...
9. ## Week 1

Off to a great start!
10. ## AP physics 1 essentials 2nd edition

Yup, great catch! Updating...
11. ## Space Engine

Absolutely beautiful. And you put that first video together? Great dramatic musical selection to go with it!!!
12. ## Ap physics 1 essentials 2nd edition

That is a FANTASTIC question, and to answer it, we need to understand that by accelerating at the top position, we're no longer maintaining a circular orbit, but setting up an elliptical orbit. If we increase the speed of the satellite in that top position, we've increased the kinetic energy of the satellite at that position. But a more complete orbital analysis must take into account gravitational potential energy. By increasing the kinetic energy at the top position, we'll trade that speed off for gravitational potential energy at the bottom position. The following web page goes into more detail (https://www.physicsforums.com/threads/orbital-speed-faster-is-closer.733175/), but the best way I've found to get a good feel for orbital mechanics is to play games. As mentioned on the thread above, Orbiter is a free game that will give you a good feel for it, but Kerbal Space Program is a lot more fun in my opinion (though it's not free). :-)

Hi Scott, The PDF book itself isn't printable due to licensing restrictions, however, you can print out all the original worksheets here: http://www.aplusphysics.com/courses/regents/worksheets/ws_index.html. The answer key is only available in electronic form.
14. ## Ap physics 1 essentials 2nd edition

I'm assuming you're attempting to use v=d/t and coming up with L/t. Recall, though, that this formula gives you AVERAGE velocity. V_f is equal to 2*average velocity under constant acceleration, which you can provide by: v_0=0 v=? d=L a t=t Solve vf^2=v_0^2+2ad to get v_f=Sqrt(2aL) Solve d=v_o*t+.5*a*t^2 to get a=2L/t^2 Combine those two equations to eliminate a and solve for vf to show vf=Sqrt(4L^2/t^2)=2L/t
15. ## Ap physics 1 essentials 2nd edition

I'm not sure I completely understand the question, but if I attempt to read between the lines, you're wondering why this isn't the same as a block sliding down a ramp. Recall for the box sliding down a ramp scenario, we're setting the motion of the box along the x-axis and 'tipping' our axes to line up with that motion. In this case, although it looks like a box on the ramp, the car is actually moving into or out of the page, not sliding down the ramp. The direction of its motion is centripetal as it goes around the curve, or directly to the right (along the x-axis)... so we don't tilt our axis in this problem. As the car's motion is along the positive axis, directly horizontal, that remains our 'reference' axis.
16. ## MRI machine

I'm hoping you get some good news too...
17. ## The Physics of Cruise Ships

Fantastic application of physics in soooo many ways. I'm always floored by aircraft carriers and how they're able to maintain such stability. Big ships are totally cool!

19. ## LaTeX for High School Math and Science

The post LaTeX for High School Math and Science appeared first on Physics In Flux.

21. ## 2D Conservation of Momentum Example using Air Hockey Discs

Great job, and I got quite a kick out of the ending!

24. ## The AP Physics C Companion - Mechanics

Version 1.0.1

\$10.00

25. ## Physics of Transistors

I also have a "microelectronics in high school" mini-unit that covers the basics of not only transistor functionality, but device physics, chip design, and manufacturing: http://www.aplusphysics.com/educators/STEP.html