Homework Statement
The maximum height reached by a projectile is 20 m. The direction of the velocity 1.0 s after launch is 20°. Find the speed of launch.
Homework Equations
vertical component of velocity = u \sin\theta - gt
horizontal component of velocity = u\cos\theta
where theta...
That was my first thought as well. But the key says no.
And as proved in my previous post, the 5% uncertainty does make sense, however if used in the original equation (or by simply reversing the second) it doesn't sum up.
Homework Statement
V=\pi r^{2} h
The uncertainties in V and h are shown below
V 7%
h 3%
The approximate uncertainty in r is:
A. 10% B. 5% C. 4% D. 2%
2. The attempt at a solution
According to the key the correct answer is B. This answer can be calculated by:
r^{2}=\frac{V}{\pi h}
which...