Recent content by BlueQuark

Homework Statement A small rock with mass 0.20 kg is released from rest at point A, which is at the top edge of a large, hemispherical bowl with radius R=0.50 m. Assume that the size of the rock is small compared to R, so that the rock can be treated as a particle, and assume that the rock...

Would you happen to be referring to ##W = .5mV_f^2 - .5mV_i^2##?

Okay, the equations that involve Initial speed are ##V_x = V_xi + a_xt## ##x = x_i + V_xit + .5a_xt^2## ##V_x^2 = Vi_x^2 + 2a_x(x - x_i)## ##x - x_i = ((V_xi + V_x)/(2))t## Okay, I assume that I need to find ##a_x## first. Going about this in the proper way seems to be difficult. From the...

Homework Statement A car is stopped in a distance D by a constant friction force that is independent of the car's speed. What is the stopping distance (in terms of D) if (a) The car's initial speed is tripled, and (b) The speed is the same as it originally was but the friction force is tripled...

That's what I thought too. It's from "Sears and zemansky's University Physics With Modern Physics, 12th edition". I guess there was a mistake or something in the answer key.

Homework Statement An old oaken bucket of mass 6.75 kg hangs in a well at the end of a rope. The rope passes over a frictionless pulley at the top of the well, and you pull horizontally on the end of the rope to raise the bucket slowly a distance of 4.00m. A). How much work do you do on the...

Okay, that does make a bit more sense. Do we know how exactly they turn into different particles though?

Okay, this quite confuses me. "Energy" isn't anything physical. You can't point at energy. It's more of a property, like length. The definition of kinetic energy is ## ke = .5mv^2##. Now, how can something like an abstract property turn into matter? An example being CERN, when new particles are...

This is what is confusing me. I can demonstrably push a higher force than the kinetic friction force and get it to move at a constant speed. Does the kinetic friction force increase with speed?

As we all know, for the most part, the kinetic friction force is, for the most part, constant. After moving my cup across my table, this thought crossed my mind. If I move my cup across the table with a constant speed, then the force I'm applying must be equal to the kinetic friction force...

Okay, I looked and found the mistake. The 30 cm hypotenuse only went from the top to the center of the ball. I should have added an extra 16 cm to it to go through the entire sphere. I got the right answer. Thank you for your help!

Homework Statement "A solid uniform 45-kg ball of diameter 32cm is supported against a verticle frictionless wall using a thin 30cm wire of negligible mass. A)Make a free body diagram for the ball and use it to find the tension in the wire. B)How hard does the ball push against the...

Homework Statement Alright, so the equation of a parabola is y = 1/4p*x^2, P being either an x or y value, and the other x or y being zero. Let's say that x^2 = 16y. If you divide both sides by 16, you get y = x^2/16, which can be simplified to y = 1/16*x^2. This is in the format of a parabola...