Easy Question- cant seem to get it

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The discussion centers on calculating the magnetic field amplitude of an electromagnetic wave given an electric field amplitude of 100 V/m. The relevant equation used is Eo = Bo * c, where c is the speed of light (approximately 3 x 10^8 m/s). The initial calculation attempted was 100/(3 x 10^8), resulting in a value of 0.0000003. However, this answer was deemed incorrect by the Mastering Physics platform, prompting further clarification on expressing the result as a decimal. The conversation highlights the need for accurate unit conversions and proper expression of scientific notation.
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Homework Statement


What is the magnetic field amplitude of an electromagnetic wave whose electric field amplitude is 100V/m?



Homework Equations


Eo=Bo*c


The Attempt at a Solution



100/(3*10^8) = .0000003

Mastering physics says this is wrong though ^^
 
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spacemanrussell said:

Homework Statement


What is the magnetic field amplitude of an electromagnetic wave whose electric field amplitude is 100V/m?



Homework Equations


Eo=Bo*c


The Attempt at a Solution



100/(3*10^8)

That looks fine to me. Now express this as a decimal.
 
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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