I'm also having trouble with this problem. Given your recommendation, I added the area of the top and bottom to the surface area formula. The top and bottom are just circles so here's what I got:
SA = 2*pi*r*h + 2*pi*r^2
If I solve for h and plug into the volume formula (pi*r^2*h), where do I...
Homework Statement
Residents of Hawaii are warned of the approach of a tsunami by sirens mounted on the tops of towers. Suppose a siren produces a sound that has an intensity level of 120 dB at a distance of 2.0m.
Homework Equations
I = P / 4\pir^{2}
The Attempt at a Solution
I...
I got it.
I rearranged Δx = Vit + 1/2at2 for time:
t = Δx / Vi --> since acc'n in the x direction is 0, 1/2at2 = 0.
So then, t = 500/ 100cosΘ where Θ = 20o
= 5.321.
Then I used y = (Vi )yt + 1/2at2
= (100sinΘ)(5.321) + 1/2(-9.81)(5.3212 )...
Homework Statement
A cannon fires a 10.0kg cannon ball 1.0m above the ground and at 20o to the horizontal with an initial speed of 100m/s. A castle 500m away has a wall 24.3m high. At what distance above the castle wall does the cannon ball pass?
Homework Equations
Δx = Vit + 1/2at2...