Recent content by cyclemun

so would i use the forumula F = rho* V * g?

Homework Statement A 6.40 cm-tall cylinder floats in water with its axis perpendicular to the surface. The length of the cylinder above water is 1.00cm. Homework Equations What is the cylinder's mass density? The Attempt at a Solution Well, I am confused because I can use the...

Homework Statement A 250 g , 20.0-cm-diameter plastic disk is spun on an axle through its center by an electric motor. Homework Equations What torque must the motor supply to take the disk from 0 to 2000 rpm in 4.50 s? The Attempt at a Solution I know that Torque = Inertia times angular...

Homework Statement A 20 kg solid door is 220 cm tall, 93 cm wide. Homework Equations What is the door's moment of inertia for rotation about a vertical axis inside the door, 14 cm from one edge? The Attempt at a Solution I know that if the pivot point is at the edge of the door, the...

ok i got it the max speed is (410)(9.8)(12) - (370)(9.8)(12) + (370)(9.8)(20) = .5 (370) v^2 and i get a max speed of 21 m/s

how would i find the excess KE at the top? is that just the original mgh of the 410 kg cart minus the mgh of the 370 kg cart?

based on my logic, it shouldn't matter what happens after the cart makes it over the hill so i would just use the formula .5kx^2 = mgh

You have been hired to design a spring-launched roller coaster that will carry two passengers per car. The car goes up a 12m high hill, then descends 20m to the track's lowest point. You've determined that the spring can be compressed a maximum of 2.3m and that a loaded car will have a maximum...

You have been hired to design a spring-launched roller coaster that will carry two passengers per car. The car goes up a 12--high hill, then descends 20 to the track's lowest point. You've determined that the spring can be compressed a maximum of 2.3 and that a loaded car will have a maximum...