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Aerosol Alarm
Chem. Help! planet x modifications?
how can you modify the following so they work on a planet WITHOUT atmosphere:
Suction cup
Candle:
Match
Paper airplane: Insert battery into airplane.
Helicopter
Rocket
Baseball and bat
Nuclear fuel rod
Plant
Parachute
Pogo stick
Swing
Automobile
Air bag
Balloon
Blow dryer
Frisbee
TNT
Smoke detector
Drinking straw
Alarm clock
Radio
Bow and arrow
Star
Bicycle pump
Squirt gun
Refrigerator
Magnet
Aerosol spray can
Shot gun
Suction cup: Adhesive
Candle: Light Bulb
Match: can't make fire without something to heat up, but thermite would still work without atmosphere, if you could ignite it.
Paper airplane: Insert battery into airplane.
Helicopter: rocket thrusters
Rocket: Already works just fine, if using solid state fuels
Baseball and bat: Already works just fine
Nuclear fuel rod: Already works just fine
Plant: put a bubble around it
Parachute: Bungee cord
Pogo stick: Already works just fine
Swing: Already works just fine
Automobile: air injector, or nitros-system, since that replaces the oxygen intake
Air bag: Already works just fine, since it has compressed air with it.
Balloon: make it stronger, able to withstand the atmosphere of pressure on the inside. Or just use less air to lower the pressure.
Blow dryer: air canister (but wouldn't be necessary, since all liquids boil in a vacuum anyway)
Frisbee: works about as well as it's going to
TNT: might work on it's own, I think.
Smoke detector: No smoke, if no fire, but it would still detect any particles that did get dispersed
Drinking straw: squeeze bottle to build the pressure
Alarm clock: headphones or radio it inside your hemet. You need air to hear, but also need air to breathe, so if you're able to breathe, you're able to hear.
Radio: same as above.
Bow and arrow: Already works just fine
Star: stars do just fine without atmosphere
Bicycle pump: compressed air
Squirt gun: squeeze bottle
Refrigerator: it would already be cold in space
Magnet: Already works just fine
Aerosol spray can: Already works just fine
Shot gun: Already works just fine
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 | Mace® Screecher Aerosol Alarm for Pocket or Purse |  |  | US $9.99 | 9d 21h 53m |
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 | SCREECHER PERSONAL AEROSOL ALARM , # 80145 | | | US $17.98 | 9d 4h 6m |
 | Screecher Aerosol Alarm "heard up to 1/4 mile away" | | | US $9.95 | 4d 10h 56m |
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| | Screecher Aerosol Alarm $14.2 Mace Loud Alarm emits an "ear-piercing" blast readily recognized as an emergency call for help. The Mace Loud Alarm's high-pitched shriek can be heard up to 1/4 mile away. Convenient size for pocket or purse. The ten gram unit has a push-top activator. The Mace Loud Alarm contains approximately 30 short blasts. |
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| | Eppendorf Model 5430 Microcentrifuge With 30x1.5/2.0mL Aerosol-tight Rotor, 120V 60Hz $4639.7 Features of the Eppendorf Model 5430 Microcentrifuge With 30x1.5/2.0mL Aerosol-tight Rotor, 120V 60Hz: Unique crossover model combines microcentrifuge capability with sophisticated features and controls. Spins micro-, PCR and cryogenic tubes like a microcentrifuge. Handles microplates and conical tubes like a larger centrifuge. Eight rotor options make this a versatile performer in the lab or coldroom. Keypad Control Capacity 60mL (30 x 2.0mL) Max. Speed/RCF 17,500rpm/30,130xG Includes 30 x 2.0mL Aero-tight Rotor 120V 60Hz Max. speed/RCF: 17,500rpm/30,130xG Menu-driven operation with large backlit LCD display. Variable speed control from 100 to 17,500rpm in 100rpm increments. Timer: 30 sec. to 99 hr. 59 min. with HOLD for continuous run. 50-program memory with 5 keys for one-touch recall of routine programs. Selectable menu language (English, French, Spanish or German). "At-Spin" functions, adjustable end-of-run alarm, adjustable SHORT-SPIN, speed parameter lock. Compact footprint. Automatic rotor recognition with speed limitation. Load imbalance detection. One finger lid closure. Soft brake function to protect delicate samples. |
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mace screecher aerosol alarm
A few Physics questions...please help!?
1. Explain why perfume can be smeeled a few distance from the person weargin it?
2. Explain why:
-Raindrops are almost spherical?
-A needle can float on water but sinks when detergent is added?
-Hairs on your head or a paintbrush cling when wet but not when dry?
-Small insects can stand on a pond of water without sinking?
-You can dry your hands with a towel but not with a sheet of polythene?
-Paint sticks to a wall?
3. Why does a bottle of lemonade alwyas have a space between the top of the liquid and the cap?
4. Why must you never put sealed bottles or 'aerosol' spray cans on fire?
5. How can u change a fire alarm to a frost alarm?
6. Explain the features which will make a thermometer quick-acting?
Scent is caused by airborne molecules from the source. When the molecules come into contact with the hairs in your nose, a message is sent to your brain that that particular molecule is in the air.
Raindrops are spherical because of surface tension. The surface tension in water is due to the relatively strong hydrogen bonds between water molecules. These relatively strong bonds pull the surface of the drop into the smallest area possible for the volume of water. Mathematically, the smallest surface area for a constant volume is achieved by a sphere shape hence raindrops are sherical.
A needle floats on water because of the surface tension I mentioned above. It only floats when you gently place it on and not when you drop it because the force of the needle due to gravity (mass times acceleration) would break the surface tension. Adding detergent also breaks this surface tension because the detergent molecules get in between the hydrogen bonds and therefore the needle will sink.
Your next two questions can also be explained by surface tension.
I suspect that the reason for the question after that is that when you rub yourself with a towel it picks up electrostatic charges which attract the polarized water molecules whereas polyethene doesn't.
I assume paint sticks to the wall because it's sticky.
A bottle of lemonade has air at the top in case the lemonade becomes heated. This will cause it to expand and since liquids can't be compressed very much the top will pop off will dangerous consequences. Gases however can be compressed and so will stop the above from happening.
You can't put sealed canister on a fire for the reason above. The fire will quickly heat up what ever is inside causing it to expand and blow the bottle/can open.
Fire detectors work by sensing smoke in the air. Frost doesn't emit any airborne molecules and so it would be undetectable.
I'm not aware of anything that will make a thermomenter act quickly but why would you want/need to. I don't know about you but where I live the temperature doesn't change so fast that a thermometer isn't quick enough to keep up with it.
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