Recent content by starfish794

I don't remember, its been years since I've done that kind of math.

How would I plug cos^2(30) into my scientific calculator to get the right answer? Thanks.

An aluminum clock pendulum having a period of 1.20 s keeps perfect time at 20.0°C. When placed in a room at a temperature of 1°C, how much time will it gain every hour? I used T=2pi*squareroot(x/9.8) and solved for x to be .357823847 as the length of the pendulum. Then I plugged that into...

That's what I took it to mean. I think the wording in the whole problem is bad.

A 2.5 kg block at rest on a tabletop is attached to a horizontal spring having constant 19.6 N/m. The spring is initially unstretched. A constant 20 N horizontal force is applied to the object, causing the spring to stretch. Determine the speed of the block after it has moved 0.900 m from...

What is the total random kinetic energy of all the molecules in one mole of krypton at a temperature of 350 K? what property of krypton do I need to know to solve this??

Consider a point in the ocean about 8.80 km deep. The pressure at that point is huge, about 9.08 107 N/m2. (a) Calculate the change in volume of 1.00 m3 of water carried from the surface to this point in the ocean. I don't get why the answer isn't zero. But anyway, I found the density at...

Piston 1 has a diameter of 0.34 in. Piston 2 has a diameter of 1.0 in. In the absence of friction, determine the force, necessary to support the 500 lb weight over piston 2. I used F(1) = pi(r1^2)/pi(r2^2)*F(2) and got the wrong answer. I used radii of .17in and .5in. Is that the right...

A coin with a diameter of 2.20 cm is dropped on edge onto a horizontal surface. The coin starts out with an initial angular speed of 15.9 rad/s and rolls in a straight line without slipping. If the rotation slows with an angular acceleration of magnitude 1.76 rad/s2, how far does the coin roll...

If a coin with a radius of 2.2cm rolls for 9.034s, how far does it roll? The answer needs to be in meters so 2.2cm=.022m. Is there a simple formula for this? I feel like I'm missing something easy.

A sample of blood is placed in a centrifuge of radius 19.0 cm. The mass of a red blood cell is 3.0 10-16 kg, and the magnitude of the force acting on it as it settles out of the plasma is 4.0 10-11 N. At how many revolutions per second should the centrifuge be operated? I converted 19cm...

If I'm finding the slope of the line of average balance mass(g) vs. total mass (g), should the units for slope be grams? or does it not have units? I know it should be g/g but would that cancel out or stay grams? Sorry if that's confusing. Thanks.

A box of books weighing 320 N is shoved across the floor of an apartment by a force of 430 N exerted downward at an angle of 35.6° below the horizontal. If the coefficient of kinetic friction between box and floor is 0.57, how long does it take to move the box 3.90 m, starting from rest? I...

Two blocks are fastened to the ceiling of an elevator. The elevator accelerates upward at 1.70 m/s2. The blocks both have a mass of 11.5 kg. Find the tension in each rope. ______________________ ....| ....| ....| ...__________ ...|...| ...|...| ....| ....| ....| ...__________...

There must be something else. I tried your plan and got 14935.88 which I'm told is still wrong. Thanks anyway.