I need some really good questions

Thread starter harmeet_angel
Start date Mar 2, 2007

AI Thread Summary

The discussion focuses on finding high-quality questions related to forces and motion. A user seeks recommendations for resources that provide challenging questions without the need to wait for a specific book. The Feynman Lectures website is mentioned as a valuable source for such questions. Additionally, a reference to a fundamental book by Reinsch is noted, although acquiring it may take time. Overall, the conversation emphasizes the need for immediate access to quality physics questions.

Mar 2, 2007

harmeet_angel

Actually, I reached here just while I was searching for them. So, I would be really thankful if someone somehow knows a site that has really good questions <those hard forces and motion questions>. I was reading some thread in here that said some fundamental book by reinsick or someone is really good, but that would take time to get that book, so for that time..

Physics news on Phys.org

Mar 2, 2007

Saketh

http://feynmanlectures.info/" has some nice questions.

Last edited by a moderator: May 2, 2017

Thread 'I've come across another fluid pressure problem I don't understand'

Neglect gravity other than that of water; neglect friction. F1=ρgsh=1000*10*1*(1+4)=50000 N; F1=ρgsh=1000*10*0.1*4=4000 N; F3=50000-4000=46000 N?

View full post »

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...

View full post »

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...

View full post »