Recent content by Lemniscate

So, just to make sure, my velocity is <5,0,0> m/s at this point? Thank you for your help, by the way. :)

The x-component of the velocity at its max ht is the same as the initial and the y-component of this vector is 0 since the ball is not acceleration vertically. Yes?

It's speed is 0, so the velocity (vector) would be <0,0,0> m/s at its max ht...?

Homework Statement A small dense ball with mass 1.5 kg is thrown with initial velocity <5,8,0> m/s at time t= 0 from the origin (<0,0,0> m) Air resistance is negligible. When the ball reaches its maximum height, what is its velocity? Homework Equations Momentum Principle Average...

Nevermind! I have found the answer! :D

Anymore tips? Still can't figure it out. :/

Homework Statement I have to find the magnitude of the velocity of vector Vcanoe/river of a canoe relative to the river. The canoe has a velocity of 0.520 m/s southeast relative to the earth. The canoe is on the river that is flowing at 0.460 m/s east relative to the earth. The angle...

Oops. I see what I did wrong. Thanks to both of you!

mgb_phys, by doing what you advised, I obtained a surface area of 5.15 x 10^8 km^2 times .70, which gave me a total of 3.6 x 10^8 km^2 roughly. 3.6 x 10^8 km^2 times 4 km for the depth gives me a volume of 1.44 x 10^14 cm ^3 (once I conver to cm). Am I missing something? Because this is...

Homework Statement Simple question, but I don't know how to correctly approach it. How many drops of water are in all the oceans on earth? Assume that 1cm^3 contains 25 drops of water. Homework Equations The average depth of the ocean is 4 km. I know I will have to convert to cm...

Homework Statement The motion diagram shown in the figure represents a pendulum released from rest at an angle of 45 from the vertical. The dots in the motion diagram represent the positions of the pendulum bob at eleven moments separated by equal time intervals. The green arrows represent...

Hm. I see what you're saying. In my problem, the length of vector C is 2. Thank you, songoku!

Homework Statement I am asked to add two horizontal vectors graphically. The result being the Cvector: Cvector= Avector + 2*Bvector Homework Equations Avector has a length of 4 in the east direction. Bvector length 1 in the west director. 2*Bvector= length 2 The Attempt at a...

Problem solved! Silly mistake I made while submitting my correct derivative. Thanks for your help though. Expanding the product made things easier.

Hm. I believe I am doing the derivative correctly. This is what I get: A*(36t^3-216t^2+288t) all over 2*(9t^4-72t^3+144t^2+1)^1/2 However, I am trying to enter the acquired derivative into a program I'm using for Physics and the deriv I entered (the one above) is "not correct." Can...