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To determine the apparent mass of a lead brick with a rest mass of 27 kg moving at 0.73c, the relativistic mass formula must be applied. The user notes that their physics teacher has not provided the necessary equations, instead suggesting the use of an online calculator, which is currently inaccessible. The discussion highlights the need for understanding relativistic effects on mass, particularly when objects are moving at significant fractions of the speed of light. Additionally, the scenario changes if the observer is moving toward the brick at -0.73c, which also requires the application of relativistic principles. Overall, the conversation emphasizes the importance of having the right resources and knowledge to solve relativistic mass problems.
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Homework Statement



You observe a lead brick with a rest mass of 27 kg. What is its apparent mass if it is moving away from you at 0.73c? The speed of light is 3e8 m/s. Answer in units of kg.

What if you are moving toward it at -0.73c?


Homework Equations





The Attempt at a Solution



My Physics teacher hasn't taught us any equations yet to help solve these types of problems. He relies on us to use an "online calculator" that is currently not working on my computer.
 
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You will want to search for the formula for "relativistic mass".
 
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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