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Miscellaneous
The Miscellaneous category is for a wide variety of questions and answers that we find important, but that have not found a home in one of our specific categories.
14,596 Questions
Is a calorimeter an open or closed system?
A calorimeter is typically considered a closed system because it is designed to prevent the exchange of matter with its surroundings during calorimetry experiments. The goal is to accurately measure the heat exchange between the system inside the calorimeter and its surroundings.
What is smaller then a microsecond?
A nanosecond is smaller than a microsecond. It is one billionth of a second.
Will a heavier ball travel farther than a lighter one from a catapult?
Well it depends. If the ball is too heavy than it won't move. If a ball is too light won't travel that far. If it's around the middle then it will travel really far if its launched at full force.
How does entropy relate to the physical world?
Entropy is random and explainable chaos. Many things that occur in life could apply to this, on a macro and microscale of things. It's science's way of saying stuff just happens and there is no way to scientifically explain it. Some say it's God will.
What is the effect of height on temperature?
Temperature tends to decrease with increasing altitude, known as the lapse rate. This is because the atmosphere becomes thinner at higher altitudes, allowing for less heat absorption and retention. However, local factors such as geography and weather patterns can also influence temperature variations with height.
Does the size of a ball affect how fast it goes when thrown?
Indirectly. There are many variables to throwing a ball. The size, for instance, can effect the efficiency of your hand, how well you can grasp it. However, it can also increase the wind-resistance if the size:weight ratio is high or low. This leads to the example of a 2-pound ball the size of a baseball or an extreme of a 2-pound beach ball inflated. You notice that you can throw the baseball at a good speed. However, if you use the same force on the beach ball, then you'll notice it goes slower. The wind-resistance is key to size.
Heat is movement of the molecules within an object, caused by some sort of an energy. Heat is transferred by the moving particles colliding with less-moving particles and making the latter move (bounce about) faster.
The types of heat transfer are heat conduction, convection, thermal radiation, and phase-change transfer.
I assume the heat from a sun-heated hammer is transfered to your hand by touching the hammer. Then it is conduction.
In conduction heat spontaneously flows from the higher temperature hammer to the lower temperature hand due collisional and diffusive transfer of kinetic energy of particles of ponderable matter (aka heat-excited particles of the hammer pounce about and collide with the particles of your hand and bump them excited).
If you do NOT touch the hammer, but only take the hand close to the heated hammer, then the heat is transfered from the hammer to your hand through radiation and convection.
Thermal radiation is electromagnetic radiation generated by the thermal motion of charged particles in matter. Like the sun radiates, there is no need for air (or anything else) to transfer the heat.
Convection is the movement of molecules within fluids (i.e. liquids, gases) and rheids. The heat is transfered to air molecules from the hammer and then from the air molecules to your hand. Some heat is lost trough convection as there are a chain of collision happening before the heat reaches your hand.
What kind of things can carbon make?
Carbon can make a wide variety of things, including diamonds (in its crystalline form), graphite (used in pencils), carbon nanotubes (with applications in electronics and materials science), and organic molecules like sugars, proteins, and fats that are essential for life.
The Material Safety Data Sheet (MSDS) does not expire, but it should be updated whenever there are changes to the information it contains. It is important to ensure that the information on the MSDS is accurate and up-to-date to reflect any changes in the composition or hazards of the product.
What is the freezing point of sparkling water?
The freezing point of most carbonated beverages, including sparkling water, is around -2°C to -3°C (28°F to 26.6°F) due to the dissolved gases creating a lower freezing point.
Can the wheel and axle lift and move loads?
only wheels and axle can not lift or move the loads.We need suspension and uprights to attach the chassis to wheel,on which we can apply loads that can be lifted and moved.this is the case of an automobile.in case of pulleys where we use wheel with axle fixed to it we need bearings to support the axle to lift and move loads..
Does Walgreens have a coinstar machine?
No, Wallgreens, CVS, and Walmart in general have no coin machines.
Winn Dixie, and Publix do!
Why is the compressor so hot on the refridgerator and no cold air is blowing out?
If the compressor is very hot and no cold air is blowing out, it could indicate a problem with the compressor itself or with the cooling system of the refrigerator. This could be due to issues such as a lack of refrigerant, a faulty compressor motor, or a blockage in the cooling system. It is recommended to contact a professional repair technician to diagnose and fix the problem.
Why is dry erase markers made of?
Dry-erase markers are specially designed to be wiped easily off non-porous surfaces, specifically whiteboards. Lecturers, teachers and presenters use them instead of chalk, as they are unaffected by water, require you to put less pressure on the board and are less messy.
The ink used in dry-erase markers is almost identical to that used in permanent markers. It is comprised of colored pigments, a chemical solvent (like alcohol) and a polymer or "release agent." The type of polymer used marks the main difference between dry-erase and permanent markers. Unlike permanent markers, which use acrylic polymers to make the pigment stick to surfaces, dry-erase markers use an oily silicone polymer. The ink's slippery consistency prevents the colored pigment from coming in direct contact with the surface so it can easily be wiped off. Furthermore, the use of alcohol as solvent makes the ink dry quickly, becoming attached to the surface but not absorbed. When the ink is dry, it is even easier to wipe off (if it is still wet, wiping will smear the ink before removing it).
Despite the ink's oily quality, dry-erase markers are permanent on any porous surface, such as paper and skin. They work on non-porous materials like glass and metal, but they are ideally suited for whiteboards. This is because whiteboards have a slight static charge, which helps the pigment stick to the surface, resulting in bold writing, but they are non-porous, meaning that wiping them clean is effortless.
Why are mineral crystals different sizes?
It depends on how it formed. Crystal sizes depend on length of time of formation, the number of seed nuclei, and the diffusivity of the environment of formation. In most igneous rocks, larger crystals are due to slower cooling rates, and are indicative of an intrusive rock. Some very large igneous crystals (as in pegmatites) can form relatively quickly due to the lack of seed nuclei and the ease with which atoms can move throughout the system. One final factor that can affect crystal size is the space available to grow.
How a pinwheel creates energy?
A pinwheel creates NO energy. It follows the laws of physics that require that energy can neither be created nor destroyed. The energetic behaviour it exhibits is due to the gases emitted by a combustion reaction.
But currently there is a developing nova in the Pinwheel Galaxy.
How can a mixture of salt and sand get separated?
A mixture of salt and sand can be separated by using the process of filtration. The mixture is poured through a filter paper or sieve, which allows the sand particles to be caught while the salt passes through as a solution. The salt water can then be evaporated to separate the salt from the water.
What is Gs in shock in excess of 300 Gs?
Anything in excess of 200G's would be similar to jumping/falling off a tall 100 story floor on a 30ft concrete floor, being in a space rocket heading straight for earth, or more realistically, the impact of a chinese satellite on the moon surface would have been about that much.
For reference, people black out at ~9G's of acceleration!
300G would be like lifting 300x your body weight
What things do not have Cfc's in them?
CFCs are not typically found in products manufactured after the 1990s due to their harmful impact on the environment. Common consumer products that should not contain CFCs include aerosol sprays, refrigerants, and foam insulation. It is important to check product labels and verify with manufacturers if you are unsure.
How much heat can a balloon withstand?
The heat resistance of a balloon depends on the material it is made of. Latex balloons can typically withstand temperatures up to 120°F (49°C) before they start to degrade and weaken, while mylar balloons can tolerate higher temperatures around 160-180°F (71-82°C). However, it is always safest to keep balloons away from direct heat sources to prevent them from bursting.
What is the thing on envelopes that you lick made of?
The adhesive on envelopes that you lick is typically made of a gum arabic solution or a synthetic glue compound. These substances are designed to become sticky when moistened, allowing the envelope flap to seal securely.
What is a fluffy mass as in smoke?
A fluffy mass in smoke refers to a collection of tiny, lightweight particles suspended in the air. These particles can give the appearance of a soft, billowy cloud-like structure, making the smoke appear fluffy or cotton-like in texture.
The local time difference between two places increases or decreases by 4 minutes for every 1 degree of longitude difference. Therefore, for a 47-degree difference, the local time difference would be 4 minutes x 47 = 188 minutes, or 3 hours and 8 minutes.
How do you store ballpoint pen to prevent leaking?
Store ballpoint pens vertically with the cap facing up to prevent leaking. Avoid exposing the pen to extreme temperatures, as this can cause the ink to expand and leak. Make sure the pen is securely capped when not in use to prevent air from entering and drying out the ink.
What is the highest strength loctite threadlocker?
The highest strength Loctite threadlocker is the Loctite 263. It is a permanent, high-strength adhesive designed for locking and sealing large bolts and studs up to 1".
