Recent content by cstout

ok, but now how do you find how much ice is needed? when density = mass/v and the density of water is 1000kg/m^3 =mass / 800mL

Homework Statement Ice at 0.0°C is mixed with 8 × 102 mL of water at 28°C. How much ice must melt to lower the water temperature to 0.0°C? Homework Equations Q = mc(delta)T The Attempt at a Solution c = 4.184 J/g K (delta)T = -28C V = 800 mL I'm not sure what to do since...

ahh..thanks, i got it now

so would i multiply the mass of .736(1000)32 to find the n, or basically i still am unsure of finding the n

Homework Statement A mass of 0.736 kg of molecular oxygen is contained in a cylinder at a pressure of 1.0 × 105 Pa and a temperature of 1°C. What volume does the gas occupy? Homework Equations PV=nRT V=nRT/P The Attempt at a Solution n=(.736)(1000)/16 = 46 V =...

ah.. thanks i got it now

Homework Statement A wire of length 4.97 m with a cross-sectional area of 0.104 cm2 stretches by 6.52 mm when a load of 0.92 kN is hung from it. What is the Young's modulus for this wire? Answer in Pa Homework Equations F/A = Y(Change in L / L) where F is the magnitude of force A =...

Ok, so the Time = Distance / Average Speed, the distance is 11.932 radians, but what is the average speed, is it simply the given speed of 3.53 or something else?

oh yea, sorry, change in velocity / change in time

change in distance / change in time

Homework Statement An LP turntable must spin at 3.53 rad/s to play a record. How much torque must the motor deliver if the turntable is to reach its final angular speed in 1.9 revolutions, starting from rest? The turntable is a uniform disk of diameter 30.7 cm and mass 0.24 kg. Homework...

Homework Statement A disk with a radial line painted on it is mounted on an axle perpendicular to it and running through its center. It is initially at rest, with the line at theta 0 = -90°. The disk then undergoes constant angular acceleration. After accelerating for 3.1 s, the reference...

so does Pi = 260(mass) and Pf = mass(velocity) so the masses cancel and the velocity is 260?

Homework Statement A firecracker is tossed straight up into the air. It explodes into three pieces of equal mass just as it reaches the highest point. Two pieces move off at 130 m/s at right angles to each other. How fast is the third piece moving? Homework Equations The Attempt...

what would you use to find the recoil speeds then?