Recent content by dragon162

bumpy bump help please

Homework Statement Suppose the system is at room temperature, 300 kelvin, and that before we put weights on top of the plunger in the cylinder the pressure inside is 1 atmosphere. 1)If i place a .5kg block on top of the piston, what is the pressure of the gas inside the cylinder? 2)At that...

Homework Statement The hot reservoir of a heat engine is steam at 100^ C while the cold reservoir is ice at 0 C. In 1.3 hr of operation, 11 kg of steam condenses and 52 kg of ice melts. Homework Equations I think power output is W=Qin-Qout The Attempt at a Solution I believe the...

Homework Statement A Carnot refrigerator operating between -30.0 ^ C and + 20.0 ^ C extracts heat from the cold reservoir at the rate 300 J/s. What are (a) the coefficient of performance of this refrigerator, (b) the rate at which work is done on the refrigerator and (c) the rate at which heat...

so pressure=1 atm, temperature=316c+273=589k, and volume would be the volume of the cylinder right? v=pi *r^2*h=pi*(121)(75)=9075pi. Then i plug this in pV=nRT solve for n. Now that i have n i use that number to solve for temperature in the other problem and then volume in the last to find the...

well if its in static equilibrium we can say the gas the pressure is not changing because there is balance? Sorry if I am not getting what you are trying to say, very lost with this problem. edit: then wouldn't the pressure on the outside be acting in and the pressure on the inside acting out?

hmm if the system is in equilibrium can't we say that the pressure won't change or is constant :o?

Homework Statement A 22 cm diameter vertical cylinder is sealed at the top by a frictionless 25 kg piston. The piston is 75 cm above the bottom when the gas temperature is 316 C. The air above the piston is at 1.00 atm pressure. 1)What is the gas pressure inside the cylinder? 2)What will...

bump, some help please

ok so i figured out for part two that the volume of the object is the same as the volume of the displaced water. so using the v olume i calculated i used m=dv=25(1)=25 to get the mass of the water. This correct? as for part two, i found out that the buoyant force= to the weight of fluid...

Homework Statement note: It may make things easier to assume that g=10 m/s^2 Suppose that I have a 100 gram chunk of metal with a density of 4 grams per cubic centimeter. 1)What is the mass of water displaced by this chunk of metal?(give your answer in kg) 2)what is the buoyant force on the...

Ah ok I understand it now. Thanks for all your help kind sir and have a nice day.

Well since the sum will be zero then the spring force must cancel out the effect of gravity. So would it be 9.8 to counter the -9.8m/s^2.

bump anymore help please have things to do today so I need to get this done early. Thanks for anyhelp in advance

So, all I have to do is use the 100 grams and the acceleration due to gravity, 9.8. So (100g)(9.8)=980 and then just convert that to N? For the second part, doesn't that mean that the spring force has to be at equilibrium so its at zero?