What is Phsyics: Definition and 24 Discussions

My solution is now I am asked for the same result but in this form but I don't know where to start.

There is a weapon in which the barrel length is 62 cm and has a muzzle velocity of 450 m / s. A 30 kg wooden chair rests on a wooden floor, the mass of the bullet is 10 g. A bullet penetrates the chair and the bullet lodges in the chair 4 centimeters. How far back, in centimeters, did the chair...

I couldn't solve the question. Can you help me?

As I have said before, I am in calculus class for the first time. I am doing really well in the class, however because of how my mind works, I’m always asking questions to know more, even when it’s too advanced for me. I just like to ponder and think about “what if” I know it’s probably not good...

Hello, Looking for some guidance for my son. He will be a senior in high school in the fall and will be applying to university programs in Ontario, Canada. He is leaning towards studying chemistry and/or physics. We (his parents) absolutely want him to follow his passions, but of course are...

I’ve been curious about understanding the mechanism behind themionic emission from what I have read I found that themionic emission happen when the energy from added temperature excess the work function of the material. I also readed when temperature excesses 1000k themionic emission happens but...

The next questions will be in english and spanish, since my birth language is spanish I may be mistaken in a few english words. --------------------------------------------------------------------------------------------------------------------------------------------- Spanish Debo advertir que...

I am not sure if I am at the right place and I hope that I am... For my EE I want to do an investigation on something related to pool table and games so it will definitely be related to momentum. And one of the common techniques in pool games is that the player aims the ball on the rail of the...

Homework Statement A thin uniform rod (of mass 10.0 Kg and length of 1.20 m) is attached to a friction-free pivot. Initially, the rod is balanced vertically above the pivot (position A in the figure attached). If the rod falls from rest, calculate a. the angular acceleration at position B...

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I really like Chemistry. I like physics but not as much as physics. Is it likely that Physics Forums will intrigue me? I found this website trying to find the model on how to solve a chemistry problem but I really enjoy the overall quality of website and was thinking I would give it a shot.

Homework Statement Homework Equations F=m*a ΣF(n-direction)= m*a(n)= m*(v^2/ρ) ∑F(t-direction)= m*a(t)\ Ffriction= Fn*coefficient(of friction) The Attempt at a Solution So I tried solving this question and apperently it is way easier than I thought. So I thought the kinetic friction has a...

Hi, I'm applying at a swiss univerity (EPFL) and I already have to pick my major. Here's the thing : I currently love programming. I enjoy finding beautiful ways to solve math programming challenges on the net. (I code in Python). I love automating stuff with programming. I love projects : I...

My question arises from trying to get the correct sign convention for a pulley that has two boxes attached by a massless rope. one box is to the left of the pulley and the other box is hanging down below the pulley. If I take the counter clockwise direction to be negative, and set up my...

How is this nomenclature read and what is the meaning of the alpha and the n? quote below In terms of the absolute 182Hf abundance, howevever, only AGB (asymptotic giant branch) models of mass ~2 to 4 solar masses are major producers of s process 182Hf in the Galaxy, owing to the combined...

I was wondering about the situation with regards to teaching high school physics and the extent that it is a viable path for those with a MS and/or a PhD in physics. I have heard it said numerous times, on physics forums and in my physics department, that many high schools are starved for...

Homework Statement A basketball player achieves a hang time of 0.978 s in dunking the ball. What vertical height will he attain? The acceleration of gravity is 9.8 m/s^2 Answer in units of mHomework Equations ? The Attempt at a Solution 9.8/0.978^2= 10.245 Homework Statement Homework Equations...

how many grams of U-233 (halflife of U-233 is 0.1592) would need to have absorbed permanently into your body for the ongoing radiation equivalent does to be equal to 20mSv per year. it decays into alpha-particle at 4.91 MeV

Short version: skip straight to bolded questions. I'm a senior in high school trying to figure out what I want to study and what I want my career to be. My main interest is physics, however job prospects seem poor for a physics major. I'd like a decent salary...one that can comfortably...

http://www.screencast.com/users/trinhn812/folders/Jing/media/5c3b51ea-aed8-4321-964c-126b49a3c1dc F/m = 0.3m/s^2 distance in x direction= 1/2(a)(T^2) By placing v(y) =0 and v(initial)=100 I found the time to be 20 sec. But my answer is 60m. So 1020-60=960m Wouldn't the ball misss the...

Homework Statement You are driving into St.Louis Missouri, and in the distance you see the famous Gateway-to-the-west arch. This monument rises to a height of 192 m. You estimate your line of sight with the top of the arch to be 2.0 degrees above the horizontal. Approximately how far (In...

more than a proper topic this is a question...my question is if all the divergences that appear in QFT are due to integrals in the form: \int_{0}^{\infty}dkk^{m} with m=-1 (logarithmic),0,1,2,3,4,5,... if not i think that for any other divergences you could express them as...

1. A ball is dropped from a height of 20m and rebounds with a velocity which is 3/4 of the velocity with which it hit the ground. What is the time interval between the first and second bounces? I don't have any idea about dealing with this problem. 2.Explain why a projectile fired from a...

Hi...I don't know a whole lot about physics but I'm getting there. I have heard a lot of times about different things that have contradicted a few laws of physics. I don't think I've ever seen a specific example, just claims. The last one I heard was on a subatomic level. My question...