Recent content by doneky

I asked that question and then went to bed. Then I started reviewing every other chapter and have been doing solely that, so I apologize, since that problem had been pretty much the least of my worries. I was literally planning on replying to that thread once I reached that chapter. This is the...

Homework Statement A projectile of mass m is launched with an initial velocity [PLAIN]https://www.webassign.net/images/boldv.gifi making an angle θ with the horizontal as shown below. The projectile moves in the gravitational field of the Earth. Find the angular momentum of the projectile...

Homework Statement In the figure below, the hanging object has a mass of m1 = 0.405 kg; the sliding block has a mass of m2 = 0.825 kg; and the pulley is a hollow cylinder with a mass of M = 0.350 kg, an inner radius of R1 = 0.020 0 m, and an outer radius of R2 = 0.030 0 m. Assume the mass of...

Oh, I'm an idiot. I forgot gravity, and in addition I misread the problem. I thought that it was saying the friction didn't apply at all for part B. Whoops.

Haha, sorry, trying to study for a midterm and so I just quickly wrote this post before moving to the next problem. My answer to part (a) is correct, and the velocity right before impact is 6.28 m/s. I applied conservation of momentum to find the combined velocities. m1v1 + (0) = (m1v)f +...

Homework Statement A 80.5 kg firefighter slides down a pole while a constant frictional force of 300 N retards her motion. A horizontal 20.0 kg platform is supported by a spring at the bottom of the pole to cushion the fall. The firefighter starts from rest 3.25 m above the platform, and the...

Homework Statement Two objects are connected by a light string passing over a light, frictionless pulley as shown in the figure below. The object of mass m1 = 4.80 kg is released from rest at a height h = 4.40 m above the table. (a) Using the isolated system model, determine the speed of the...

Homework Statement A uniform beam of mass m is inclined at an angle θ to the horizontal. Its upper end (point P) produces a 90° bend in a very rough rope tied to a wall, and its lower end rests on a rough floor (see figure below). Let μs represent the coefficient of static friction between...

I'm kind of confused now. I don't know if what I said made sense. I meant that if you did a force balance equation along the surface of the water, you would get the component of mg that goes along the surface as well as some opposite (which is what I meant by "normal" because I didn't know a...

Homework Statement A basin surrounding a drain has the shape of a circular cone opening upward, having everywhere an angle of 34.5° with the horizontal. A 28.5-g ice cube is set sliding around the cone without friction in a horizontal circle of radius R. (a) Find the speed the ice cube must...

Does it make a difference, though? I've been doing it this way, and it seems to make more sense for me. Are you saying it should be N + mg = mac because gravity is negative? It's just more intuitive for me to do it the other way.

Well, I kind of get that it's a resultant force, but I don't get how, especially in this problem, Basically, if you applied Newton's 2nd law, Fnet = ma, you would get N - mg = mac. Right? I just don't understand how you get the normal force, if it's not equal to mg in this situation.

Homework Statement A roller coaster at the Six Flags Great America amusement park in Gurnee, Illinois, incorporates some clever design technology and some basic physics. Each vertical loop, instead of being circular, is shaped like a teardrop. The cars ride on the inside of the loop at the top...