Some Pirates have stolen some Silver coins that are mixed with some fake Aluminum coins, You are told  if you can separate them they will let you live.  The coins are the exact same size and appearance. You can choose to do it one of the following ways  :   I. You can weight each of the coins. If you know which metal is denser,  you can tell them apart because one will be heaver.   II. All of the methods would work, but I would still die because I don't know any of that stuff.   III. You can melt the coins down.  If you know the Latent Heat of Fusion , you know which one will melt first and can separate them.   IV. You can heat the coins 2 at a time, If you know the Specific Heat of the metals , you can tell them apart because one will heat up faster.

A food coloring has a diffusion constant in water of 10 x 10–10 m2/s. A difference of food coloring concentration of 20 g/m3 is maintained between the ends of a cylinder with a cross-sectional area of 5 cm2 and a length of 8 cm. How much mass of food coloring diffuses though the cylinder in 20 minutes?  A.1.5 x 10-10 kg B.1.5 x 10-8 kg C.1.5 x 10-6 kg D.1.5 x 10-4 kg E.1.5 x 10-2 kg

15 Tuesday 4/19 lapeuty of mi Students are given three cubes made of unidentified materials. They need to determine whether or not the three cubes are made of the same material. They measure the mass of each cube and record it in the table. A student immediately concludes that the cubes are made of three different materials. Cube Mass (g) A 42 C 7 What observation would best support the students' conclusion? A. The cubes all have the same volume. B. The cubes all have a shiny appearance. C. The cubes are all attracted to a magnet. D. The cubes all conduct heat.

A hot air balloon uses the principle of buoyancy to create lift. By making the air inside the balloon less dense then the surrounding air, the balloon is able to lift objects many times its own weight. A large hot air balloon has a maximum balloon volume of 2090 m3   a. What is the density of air inside the balloon, in terms of the pressure P, temperature T, molar mass M, and the gas constant R?  b. How much mass can this balloon lift (in addition to the mass of the gas inside) in terms the balloon volume Vb, the atmosphere air density ρa, the density of the air in the balloon ρg, and the gravitational acceleration g?  c.  If the air temperature in the balloon is 54 °C, how much additional mass, in kilograms, can the balloon lift? Assume the molar mass of air is 28.97 g/mol, the air density is 1.20 kg/m3, and the air pressure is 1 atm.

A PROBLEMS 6.63, 6.64 6.64 This "double" nozzle discharges water (at 10°C) into the atmosphere at a rate of 0.50 m /s. If the nozzle is lying in a horizontal plane, what x-component of force acting through the flange bolts is required to hold the nozzle in place? Note: As- sume irrotational flow, and assume the water speed in each jet to be the same. Jet A is 10 cm in diameter, jet B is 12 cm in diame- ter, and the pipe is 30 cm in diameter.

P31 A hanging copper wire with diameter 1.4 mm (1.4x10^-3 m) is initially 0.95 m long. When a 36 kg mass is hung from it, the wire stretches an amount 1.83 mm, and when a 72 kg mass is hung from it, the wire stretches an amount 3.66 mm. A mole of copper has a mass of 63 g, and its density is 9 g/cm^3. Find the approximate value of the effective spring stiffness of the interatomic force.

10 00 R %24 Homework 6 3.Water is flowing in a pipe that has varying cross-sectional area throughout, and at all points the pipe is completely filled with water. At one point the cross-sectional area of the pipe is 0.07 m^^2, and the velocity of the fluid is 3.50 m/s. What is the fluid velocity in the pipe where the cross sectional area is instead (a) 0.105 m^2 and (b) 0.067 m^2. (c) also calculate the volume discharged from the end of the pipe in one hour (Hint: Use volume flow rate eq. V/t=A*v and solve for V) Q=AV 0.105*0.067= f12 f8 114 A f4 十百 & 7. 4.

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The density of air at 20 degree celcius is 1.204 kg/m3. The density at temperature 100 degree celcius is 0.9467 kg/m3. If an average size hot air balloon envelopes a volume of 2200 m3, how much weight can it lift (including the balloon itself)? a. 5.55 kN b. 11.1 kN c. 20.4 kN d. 26.0 kN

I put air in the tires of my car during the summer, while it was 28.8 °C outside (about 83.8 °F). My tires say to fill them to a pressure of 203,000 Pa.   Boltzmann's constant is 1.38 * 10 ^ - 23 * J / K   A) If my tires have a volume of 0.0100 m³, how many air molecules are in the tire?   N = molecules   B) These tires go all summer without losing any air, however come fall the temperature drops down to 8.65 °C (about 47.6 °F). Assuming the volume doesn't change (because it doesn't) what is the new pressure in my tires?   P=