Recent content by norcal

Homework Statement The hemispherical tank shown is full of water. Given that water weighs 62.5 lb/ft3, find the work required to pump the water out of the tank. (the water will be pumped out of a spigot at the top) Homework Equations INTEGRAL from 0 to 5 of: pi*(5-h)(25-h^2)dh The...

1. Homework Statement In the product F = qv x B , take q = 4, v = 2.0i + 4.0j + 6.0k and F= 136i -176j + 72k. What then is in unit-vector notation if Bx = By? 2. Homework Equations 136i-176j+72k = 8i+16j+24k X Bxi+Byj+Bzk 3. The Attempt at a Solution I am stuck with the above...

oops I did a typo. I know that. It's: 136i-176j+72k=8i+16j+24k X Bxi+Byj+Bzk So If I find the determinant from the right hand side it's: 136i-176j+72k=((16)(Bz)-(By)(24))i+((24)(Bx)-(Bz)(8))j+((8)(By)-(16)(Bx))k 136i-176j+72k=(16Bz-24By)i+(24Bx-8Bz)j+(8By-16Bx)k Now what do I do?

Homework Statement In the product F = qv x B , take q = 4, v = 2.0i + 4.0j + 6.0k and F= 136i -176j + 72k. What then is in unit-vector notation if Bx = By? Homework Equations 136i-176j+72k = 8i+16j+24k + Bxi+Byj+Bzk The Attempt at a Solution I am stuck with the above equation...

As stated in the question I am supposed to "USE ENERGY TECHNIQUES ONLY", meaning KE and U to find the velocity but I am not sure how to do this differently here than projectile motion.

ok, well do I have the correct values of R set up in the equation or do I need to take the difference of the distance of the satellite to the center or anything?

W=work done

Homework Statement A thin rod, of length L and negligible mass, that can pivot about one end to rotate in a vertical circle. A heavy ball of mass m is attached to the other end. The rod is pulled aside through an angle and released. What is the speed of the ball at the lowest point if L =...

Homework Statement Zero, a hypothetical planet, has a mass of 1.0x10^23 kg, a radius of 3.0x10^6 m, and no atmosphere. A 10 kg space probe is to be launched vertically from its surface. (a) If the probe is launched with an initial kinetic energy of 5.0x10^7 J, what will be its kinetic...

Homework Statement A 1.50 kg snowball is fired from a cliff 12.5 m high with an initial velocity of 14.0 m/s, directed 41.0° BELOW the horizontal. Using energy techniques ONLY, find the speed of the snowball as it reaches the ground below the cliff. Homework Equations...

Homework Statement What work is done by a force (in Newtons) F = 3.1xi + 3.1j, with x in meters, that moves a particle from a position r1 = 2.1i + 2.5j to r2 = - -4.9i -3.9j? Homework Equations Work=integral(Fdx) The Attempt at a Solution W1=integral of Fxdx = integral (3.1x)dx...

Homework Statement A single force acts on a 5.0 kg particle-like object in such a way that the position of the object as a function of time is given by x = 3.0t - 4.0t^2 + 1.0t^3, with x in meters and t in seconds. Find the work done on the object by the force from t = 0 to t = 2.0 s...

maybe so but in the section of this book it says not to use KE as KE is conserved. Thus, using KE for this problem would be ridiculous.

Homework Statement "Relative" is an important word. Block L of mass mL = 1.90 kg and block R of mass mR = 0.500 kg are held in place with a compressed spring between them. When the blocks are released, the spring sends them sliding across a frictionless floor. (The spring has negligible mass...

KE is not involved in this problem, only conservation of momentum.