Angular Magnification of a telescope,

AI Thread Summary
To calculate the angular magnification of a telescope with a mirror radius of curvature of 14.0 m and an eyepiece focal length of 19.0 cm, the necessary equations and understanding of magnification principles are essential. The original poster is struggling due to a lack of provided equations and guidance from their teacher. Responses emphasize the importance of demonstrating understanding and effort in problem-solving, rather than simply seeking answers. Clarification on the educational context, such as the nature of a "cyberclass," is also suggested to facilitate better assistance. Overall, a deeper engagement with the problem is encouraged for effective learning.
Bleitergast
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Homework Statement


A telescope consists of a mirror with radius of curvature 14.0 m and an eyepiece of focal length 19.0 cm. Approximately what is the value of its angular magnification

I haven't yet been asked to find angular magnification given such little detail, my cyber-school program doesn't give me the necessary equation for this particular problem and my teacher is on vacation so if someone could give me a tiny hint I'd be tickled pink.


Homework Equations


m=height of image/height of object (my cyberschool says it's useful but I disagree)


The Attempt at a Solution


no clue
 
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Hello Bleiter, and welcome to PF.

Looks like you are ill-equipped to deal with the exercise at hand! Just quoting the definition of magnification factor doesn't suffice under 2. and "no clue" under 3. doesn't count at all. In fact, the folks at PF don't just dislike that, they even put it in the rules, which please get acquainted with.

It's not just for you, also for potential helping hands: I for instance have no idea what a cyberclass is and whether that is before a PhD or beyond.

So show a little more, google around and tell us where precisely you get stuck. Would the same exercise but with a Galilean telescope be a piece of cake for you, or would it leave you equally clueless?
 
Thread 'Variable mass system : water sprayed into a moving container'

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}...
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