Solimo Aluminum Foil

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FAQ

110 grams of boiling water (temperature 100° C, heat capacity 4.2 J/gram/K) are poured into an aluminum pan whose mass is 900 grams and initial temperature 22° C (the heat capacity of aluminum is 0.9 J/gram/K).Tf 50.330What simplifying assumptions did you have to make?The thermal energy of the aluminum doesn't change.The thermal energy of the water doesn't change.Energy transfer between the system (water plus pan) and the surroundings was negligible during this time.The heat capacities for both water and aluminum hardly change with temperature in this temperature range.

The thermal energy of the aluminum DOES changeIt goes from 22 C to 50.33 CThis in an increase of about 23 kJLikewise the thermal energy of the water DOES changeIt goes from 100 C down to 50.33 CThis is a loss of about 23 kJ You have to assume that heat capacities are temperature independent (they do not change over the range of temperatures in this questions)A very reasonable assumptionYou have to assume that no heat is lost from the water or the pan and no heat is lost in pouring the water into the panYou are assuming that none of the water is leaving the system as steam (not a very good assumption, but if you work fast you can minimize the heat lost to steam) You are assuming the water and pan are in thermal equilibrium - the heat is spread evenly through the water and through the pan so that everything has the same temperature Finally, you have to assume that your instructor has some way to measure these temperaturesMeasuring the temperature of something is very difficult without adding or subtracting energy from the systemThis is not really an assumption that you have to make to work the problemHowever, it would be extremely difficult to experimentally verify this problem Hope this helps.

An aluminum sphere (specific gravity 2.7) falling through water reaches a terminal speed of 3.1 cm/sWhat is the terminal speed of an air bubble of the same radius rising through water? Assume viscous drag in both cases and ignore the possibility of changes in size or shape of the air bubble; the temperature is 20°C where air density is 1.20 kg/m3 and water density is 1001.80 kg/m3.

strong, light, conductivity, cheap, corrosion resistant but manly titanium is used

Light of wavelength 200 nm falls on an aluminum surfaceIn aluminum 4.2 eV are required to remove an electronWhat is the kinetic energy of (a) the fastest and (b) the lowest emitted photoelectrons? (c) What is the stopping potential? (d) What is the cutoff wavelength for aluminum?

these can be found from your chapter on photo electric effect energy of photon will liberate the electron it will lose 4.2 eV in moving to the surface than it will move with kinetic energy of whatever the energy is left so the photon is 200 nm E h f f c/L then E h c/L h 4.14110^-15 eV units E 4.14110^-15310^8/20010^-9 E 2.0705310^0 E 6.2115 eV E K + Wo K E - Wo K 6.2- 4.2 2.0 eV so the highest K will be 2.0 eV the lowest K will be of course 0 eV (because it could hit more than the usual number of atoms and loose all its energyc) what is the stopping potential if the highest Ke of the electron is 2.0 eV then to stop any electrons from having any Ke we just need to have a force pushing them back with 2.0 eV potential I would think this is -2 V W eV solve for V this means if the V is reversed it will have enough Electric field to stop the electrons with the highest Ke from hitting the anode V K/e V 2eV/e 2V so a stopping voltage of -2V is required to stop the electrons it must be negative because electrons are repelled by a negatively charged plate d) the cutoff wavelength is just the lowest energy photon that will just excite the electron E Wo since hc/L Wo solve for L L hc/Wo use h 4.14110^-15 L 2.95810^-7 L 295.8 nm thats all there is to it just think it through

we cut the top off an alumium heniken (i think its a gallon keg)...we cut the top off and put in the dirt and the plant in it...someone told us that the aluminum will kill it.....anyone know?

I think you'll be fine as long as you drilled some drainage holes in it.

Why is the US government allowing the space shuttle program to die? We should build 3 new ones with updated materials technology and replace the aging fleetInstead - we're going back to capsules - little round aluminum cans that get shot into space on a the tip of a rocket and then have to parachute back to earth.Parachute.In the 21st century.How can the Orion be used for mass evacuations of the ISS, or carry large crews into space, or carry grouops of high paying tourists into space? Or go out and repair sattelites (like the Hubble last week)?I suggest that every concerned US citixen (and international space exploration enthusiast) get off thier butts and start letting the Whitehouse and Congress know we're not happy - before it's too late.In a couple of years we will be back to 1968 level space exploration.Great.

Such a big differenve in gauge needs the pattern to be rewritten completelyMost patterns now give a block of each piece in the garment showing the finished measurementsKnitting a swatch with your chosen yarn to find the gauge with that yarn together with the block gives the data required to rewrite the pattern.

If I'm cooking and I use aluminum foil instead of baking paper, would it make a huge difference ?

if u're making a cake baking paper is best (it'll be easier to remove the paper) if u're cooking frozen foods like chicken stirps, fries, etcthe foil will be fine

My new kitten is driving me crazy! She follows me everywhere, biting at my toes and ankles, using my legs as a ladder, tearing into my skin with her nails, climbing up the back of the couch and biting me in my neck, my earsI've put her outside and she climbs the screen door, tearing the screen out of the frame, I've put her in a training crate at night so that she doesn't crawl under our bedroom door and she cries and cries, biting her way out of the cageI hate doing this to her but she's out of controlShe can be a real loving cat 'at times' but others, I feel like I wanna strangle her (which I would never do)What can I do to calm this critter down? I've bought her pom pom balls and a scratching post, she has my other cat to play withHelp!!

If three bowls of cereal throughout the entire day is too much food, then you have bigger problems than not getting enough fiber; you're probably starving yourselfIf you dedicate yourself to including a wide range of plants and whole grains in your diet, then your fiber intake will be completely taken care of.

I used to keep celery in a big Ziploc bag and it would go bad fairly rapidlyNow I wrap it in aluminum foil and it seems to stay crisp much longerAny ideas why?

Aluminum stays colder so maybe the metal chills out more keeping it fresher.