Recent content by Serik

I'm totally lost in a page of equations...there's some simple relationship I'm missing. After following your suggestion, I came up with the following: Me/Ve = Pc*Vc + Pm*Vm/(Vm+Vc) = 5500 kg/m^3 Pm = 5500(Vc+Vm)/2.34Vc+Vm I try and cancel terms so I'm not putting stuff in terms of...

Homework Statement What is the average density of rock in the mantle? The Earth's average density is 5500 kg/m^3; the radius of the core is 3490 km; ratio of core density to mantle density is 2.34 Homework Equations Pc = density core Pm = density mantle Pe = density earth Mm = mass mantle Mc...

Ahhh, thanks. In the corner of my notes, I scrawled h=Habove earth + Rearth, but failed to carry that substitution through the remainder of my calculations. So at the surface, which I shouldn't really call y=0, the spacecraft will have gravitational potential energy because it's a distance...

Homework Statement A 3000 kg space vehicle, initially at rest, falls vertically from a height of 3500 km above the Earth's surface. Determine how much work is done by the force of gravity in bringing the vehicle to the Earth's surface. Homework Equations Gravitational potential...

Lazyshot, I should've placed the negative sign outside the parenthesis, but yes, according to my book and MasteringPhysics, that is the coefficient. FD=-(1.00x104)v

Homework Statement You dive straight down into a pool of water. You hit the water with a speed of 7.0 m/s, and your mass is 75 kg. Assuming a drag force of the form FD= (−1.00×104 kg/s)v, how long does it take you to reach 2% of your original speed? (Ignore any effects of buoyancy.)...

My freshman year began at the University of Missouri-Columbia where I was majoring in print journalism. But I hated living there, so I transferred to the University of Washington to finish off my freshman year. While taking some general ed classes, I became interested in geology/earth and space...