Recent content by kinthos

Average velocity is defined as displacement over time, or the change in position divided by time. Average speed, however, is equal to the distance traveled divided by the time interval of the motion. The two quantities are completely different. One is a vector and one a scalar; do you know why?

Homework Statement 7.80 g of copper (II) sulfate pentahydrate (CuSO4*5H2O) were dissolved in a beaker of 50 mL of water and heated slowly. 2.00 g of iron filings were added to the solution, and then the mixture was allowed to cool. The supernate was decanted, and the contents of the beaker...

There is a distinct difference between cos T^2 and cos^2 T. (Pretend that T=the angle.) Your problem asks for cos^2 T, or (cos T)^2 (calculator form). This means (cos T)(cos T), rather than cos (T*T).

Ah, no, this is our class's first day on the topic of work, and I haven't looked at energy yet. I think, instead, that the work would be positive because the force is exerted on the bucket by the rope. If that is true, then would the work done by the rope on the bucket be negative? The tension...

"A rope exerts a force on a bucket as the bucket is raised up a well." Is the work done on the bucket positive or negative? Now, I know that the is a tension force in the rope that must overcome weight to accelerate the object up the well. Also, work is positive if the force exerted is in the...

You've been given 8.75 moles of H2P2O7, which contains 2x8.75 moles of H, 2x8.75 moles of P, and 7x8.75 moles of O. In one mole of anything (H2P2O7, P atoms, eggplants, etc), there are 6.02E23 particles.

Mmm...uk (coefficient of kinetic friction) = friction/normal force. Friction = weight(sin 38) and normal force = weight(cos 38). Reducing this fraction to lowest terms would produce sin/cos, which = tan...uk = tan 38 = 0.781. Would this be correct?

Well, the force of kinetic friction and the force that causes the motion would sum to 0 N (the two forces would be equal in magnitude but opposite in direction). The only forces that act on the child and the wagon would be the weight, friction, and applied force...unless you include the normal...

"A child rides a wagon down a street with an inclination angle of 38.0 degrees. In order to keep from moving to fast, the child has secured the wheels of the wagon so that they do not turn. The wagon and the child then slide down the hill at constant velocity. What is the coefficient of kinetic...