Physics Forums
1,510 FOLLOWERS
Physics Forum is providing a community for students, scientists, educators, or hobbyists to learn and discuss science. Find experts debating the latest physics research, talking about engineering, computing, technology, biology, medicine, etc.
Physics Forums
4h ago
This is the problem set. I am stuck from this point... If anyone could give me a hand I would really appreciate it. I know this is probably really simple, but I don't know any of this and have been trying my best with youtube, and other peoples posts.
PS this is for high school ..read more
Physics Forums
4h ago
For the period before ##t=0##, during which the switch was closed we have
$$-\epsilon_0+IR_1=-L\dot{I}\tag{1}$$
$$\dot{I}+\frac{R_1}{L}I=\frac{\epsilon_0}{L}\tag{2}$$
and the solution to this differential equation is
$$I(t)=\frac{\epsilon_0}{R_1}+e^{-\frac{R_1}{L}t}\tag{3}$$...
Read more ..read more
Physics Forums
4h ago
Is the answer 1? Because the cord is connected to vibrating source and it vibrates with a frequency of 100 Hz so section A and B have the same frequency
Thanks ..read more
Physics Forums
4h ago
I was looking for videos, or post on how to do a physics home work problem. Ended up finding a similar post on this website. It didn't quite answer my question, but I thought I could post here to figure it out ..read more
Physics Forums
5h ago
C. There is no net change in force, momentum, or velocity of the sail craft because the fan exerts a forward force on the air; however due to Newton's third law the air exerts an equal and opposite force on the fan. This air then exerts a forward force on the sail which cancels out...
Read more ..read more
Physics Forums
7h ago
So I've seen that radar can be used in space which is interesting and brings questions to mind as well as theories. Unrelated Sonar which uses sound waves don't work as sound isn't transmittable through space.
Questions:
1) What techniques are used in radar to prevent "wondering" or the radio...
Read more ..read more
Physics Forums
7h ago
I have a leaf blower that states the sound level is 75dB. My question is, at what distance is this measured. It seems that as you get closer to the source, the dB number will increase drastically. If I double the distance from the source, then the power should go down by a factor of four or 6...
Read more ..read more
Physics Forums
8h ago
I am currently a hs freshman enrolled in PLTW's PBS (principles of biomedical science) and I hate it. I hate learning about life and cells and dna and that stuff and I don't wanna do it anymore. My school forces all freshmen and sophomores to do PLTW's PBS and HBS (human body systems) for some...
Read more ..read more
Physics Forums
10h ago
You have a rope hanging over a fixed support with a heavy weight at one end and a lighter weight at the other end. You set the end of the rope with the lighter weight spinning in a circle and let the heavy weight end fall under gravity. As the heavy end falls the length of the rope that is...
Read more ..read more
Physics Forums
13h ago
Assume the solenoid is very long such that the magnetic field can be approximated as constant inside.
If there weren't any ring surrounding the solenoid, then when the switch were closed we would have the following equation from Faraday's law
$$\oint \vec{E}\cdot...
Read more ..read more