how to solve these physics question. Prepare before school start. BUt stuck ....

Test Preparation AP Sciences
1

<p>Here are the equations:
K=1/2mv^2
∆Ug = mgh
W= F(∆x)cosΘ
Us=1/2kx^2
P=W/t
P=Fv(avg)(cosΘ)</p>

<p>Here are the questions:
1.K=∆Ug, g=9.8 m/s^2, and h=10m. Find v.
2. The third equation can be used to find W if you know what F is 10N, ∆x is 12 m, and Θ is 180 degrees.
3. Use the value of W from the previous question to find P if t = 2s. Which equation do you need?
4. For the same value of x as given in problem 3 and the k value you just found, use this equation (Fs=-kx) to find Fs.
5. Assuming Θ=0 degree and F=Fs use the third equation listed above along with the number found and given in the previous two question to find W.
6. For P=2100 W, F= 30N and Θ=0 degree, find v(avg) using the last equation in this section.</p>

2

<p>1)
K = -∆U
(mv^2)/2 = mgh
v^2 = 2gh
v = sqrt(2gh) m/s</p>

<p>2)
W = F∆xcosΘ = -120J</p>

<p>3)
P = W/t
P = -120J/2s = -60W</p>

<p>4&5) You’re only giving us part of the question, we need the entire question to know things like what k is.
6) P = FvcosΘ
P/F = v since cos0 = 1
v = 30 m/s</p>

<p>Please read the textbook before posting :(.</p>