Recent content by yaser1989

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 )...

Anyone?

The second one is right because both of the objects are moving in the same direction hence you would ADD the initial momentum of each mass.

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...