Recent content by lgen0290

Homework Statement A lead ball is dropped into a lake from a diving board 5.44 m above the water. It hits the water with a certain velocity and then sinks to the bottom with this same constant velocity. It reaches the bottom 4.84 s after it is dropped. (Assume the positive direction is...

Thanks. You could have simply pointed out that my conversion was incorrect on the seconds.

But wouldn't that make the number even bigger? Is the reaction time after 50 ms really 122.5 cm? It just doesn't sound right.

Homework Statement The figure below shows a simple device for measuring your reaction time. It consists of a cardboard strip marked with a scale and two large dots. A friend holds the strip vertically, with thumb and forefinger at the dot on the right in the figure below. You then position...

Homework Statement A ball of moist clay falls 12.0 m to the ground. It is in contact with the ground for 22.0 ms before stopping. (a) What is the average acceleration of the clay during the time it is in contact with the ground? (Treat the ball as a particle.) Homework Equations v^2 =...

OK, I tried what I concluded above and there is a problem somewhere, I can't figure out where though. The answer is not the correct answer.

Thanks. That would give me a right triangle in the third quadrant with a 50 degree angle. My y component would then be sin(50)*2, right? The X would then be sin(40)*2?

Homework Statement What are the x and y components of a vector a in the xy plane if its direction is 230° counterclockwise from the positive direction of the x-axis and its magnitude is 2 m? Homework Equations The Attempt at a Solution My main issue is I'm not sure where...

Thanks. Where did the 3.35 come from? How would I solve t^-.2?

OK, there is .1km squared per hectacre. I multiplied by 80, then by .026. I got .208, which is not correct.

Homework Statement Water is poured into a container that has a leak. The mass m of the water is given as a function of time t by m = 6.00t 0.8 - 3.35t + 23.00, with t 0, m in grams, and t in seconds. (a) At what time is the water mass greatest? (b) What is that greatest mass? (c) In...

Homework Statement A unit of area, often used in measuring land areas, is the "hectare", defined as 104 m2. An open-pit coal mine consumes 80 hectares of land, down to a depth of 26 m, each year. What volume of earth, in cubic kilometers, is removed in this time? Homework Equations...

Can someone explain it please? How do you determine which is u and which is dv?

The only problem is I don't do where to go once I get u, du, v and dv. Is it like substitution or?

I am not sure. I picked it as it seemed to be easiest to derive the derivative from.