Bob

http://i.imgur.com/4HCdy.png

Is the second problem in the above link correct? Where

I = 8cos1000t

V = 4sin1000t

t=.002s

-->

So I = 8cos(1000*.002) mA ~ 0.008A

V = 4sin(1000*.002) V ~ -0.14V (Negative because P is being delivered.)

P = IV = (0.008A)*(-0.14) = -0.00112W being DELIVERED.

Therefore, it is 0.00112W being absorbed and NOT 12.11W as mentioned in the picture??

Was there a mistake in the picture or my work?

A rope with length L = 1.0 m and mass m = 0.50 kg hangs from the ceiling. Attached to the bottom of the rope is a small rock with mass M = 0.40 kg The rock is given a small tap which creates a pulse that travels up the rope. How long does the pulse take to travel the length of the rope?

--

Here is my try:

where v = sq root(F/mu);

F = Tension = 0.40 * 9.8 = 3.92N

mu = m/L = .5/1 = .5

v = sq root(3.92/.5) = 2.8m/s

1/2.8 = .35714s for the pulse to travel the length of the rope.

However the answer is .29s ... where was my mistake(s)?

http://i56.tinypic.com/2cqea9u.png

I have a = [Fcos20 - t - (m2gcos30+(m1g-Fsin20))(.15)]/(m1+m2) = 1.60m/s^2

I know I can solve for T and find the tension but the problem is how I would I go about finding tension without knowing acceleration = 1.60m/s^2?

http://fog.ccsf.cc.ca.us/~wjeh/math110B/calculus2_...

From 5a. to 5n. WHICH methods of integration would you use? (integration by parts, trig sub, u sub, etc.,) I seem to be lost when it comes to starting out an integral. Suggestions?

Thanks :)

int 1/(x^2)*(x-1)^2 dx

Do I distribute the (x-1)^2 with x^2 ?? Or do I go right ahead and do

A/x^2 + B/x-1 + C/(x-1)^2 and proceed???

For example,

http://fog.ccsf.cc.ca.us/~wjeh/math110B/calculus2_...

4a. I don't get how the answer is reached...do you long divide first? and if so what do you do with the result of the long division? integrate them both?

int (x^2)/(x+4) dx

Degree of numerator is greater than denom so i long divide to...x-4 + 16/(x+4)

Not even sure if i divided correctly....after that does it just turn to x-4 + A/x+4???

AHHHHH

int (sin^6x)(cos^5x) dx

Should i split up the 6x or the 5x??? or BOTH!!!? AHHHH

http://i51.tinypic.com/pbwhx.png

Any help would be greatly appreciated! thanks

A stone is thrown at 25m/s at 50degrees above the horizontal. At what time(s) is its

velocity at 30degrees to the horizontal?

Answers supposedly come out to 1.01s and 2.90s

I am completely lost as to where to start and what to do. =/

When a body is fired vertically up from the ground it reaches 75% of its maximum

height with a speed of 30m/s. Find its maximum height and the time of flight.

Answer supposedly comes out to 184m and 12.2s

How?

A stone is thrown at 25m/s at 50degrees above the horizontal. At what time(s) is its

velocity at 30degrees to the horizontal?

The maximum height from which a person can safely jump is 2.45m. What is the

maximum allowable landing speed for a parachutist?

I'm assuming y = 2.45m

a=-9.8m/s^2

yeah...i have no idea. Help? =/

Limit as x approaches infinity

x / ( 2x + square root of 4x^2+x )

(-2x^5)(((8x^5)+6)^-9)

(-2x^5)*(((8x^5)+6)^-9)

answer is supposedly (10x^4)*(((8x^5)+6)^-10)*(64x^5)-6)

HOW........

(-2x^5)*(((8x^5)+6)^-9)

answer is supposedly (10x^4)*(((8x^5)+6)^-10)*(64x^5)-6)

HOW........

Now originally the function is (5u^7)/(((u^5)-1)^6)

Then I turn it into product rule so it becomes (5u^7)*(((u^5)-1)^-6) just to make it simpler...

I keep getting answers similar to the final answer but nope...never right on the spot

Answer is supposedly (-5u^6)*(((u^5)-1)^-7)*((23u^5)+7)

Well, they called me for an interview for tomorrow at 9AM and I have no idea what to do. This is my first job. What should I wear? And what do I need to bring? Thanks, as much detail as possible would be greatly appreciated. :D

f(y) = ((1/y^2) - (3/y^4))(y+5y^3)

Where do I begin...