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Science
The observation, identification, description, experimental investigation, and theoretical explanation of phenomena is all part of science. Nothing is immune to the scientific process: from charm quarks that haven't existed naturally since the beginning of time to Pluto, recently demoted from planet to dwarf planet. Questions on knowledge about the material and physical aspects of our world are asked and answered here.
203,801 Questions
What are the disadvantages of drag?
More effort to accomplish the same thing.
In Aerodynamics Drag causes the vehicles to slow down, the faster they are going the more drag they experience and the much more fuel is needed increasing the costs of maintenance and greatly influencing how vehicles are design.
Oh, dude, when you drop universal indicator into calcium hydroxide, you'll see a color change from purple or blue to a more vibrant purple or pink. It's like magic, but with chemicals. Just don't drink it thinking it's a fancy cocktail, okay?
How is a shark's skeleton different from a perch's?
Sharks and perches have different skeletons by how sharks by how shark's body are straight and aligned to have quick movement in bodies of water. On the other hand, perch's have rough, rigid scales on their body. On the other hand sharks are made of cartilage (the perch are not).
Will a magnet stick to chrome?
No, a magnet will not stick to chrome because chrome is a non-magnetic metal. Chrome is typically used as a plating material on surfaces to provide a shiny and corrosion-resistant finish. Magnets only stick to materials that contain iron, nickel, or cobalt, which are known as ferromagnetic materials. Chrome does not contain any of these elements, so it does not attract magnets.
What does mr n greww stand for?
Mr N Greww stands for:
M Living things must 'M'ove R Living things can 'R'eproduce
N Living things need 'N'utritionG Living things 'G'row as they get older R Living things 'R'espond to stimuli E Living things 'E'xchange gases with their environment W Living things produces 'W'aste W Living things need 'W'aterWell, isn't that a happy little math problem we have here! To find the acceleration, we can use the formula: acceleration = (final velocity - initial velocity) / time. Plugging in the values, we get: acceleration = (12 - 54.8) / 39. So, the acceleration of the train is approximately -1.27 m/s². Remember, there are no mistakes in math, just happy little accidents!
How many quarter liters of water is the same as 2 liters?
Oh, what a lovely question! Two liters is the same as 8 quarter liters of water. Isn't that just wonderful? It's important to remember that math can be as peaceful as a quiet stream, flowing gently through the forest of numbers.
What helps us see a stream of light entering through a gap in the curtains of a room?
The stream of light that we see when light enters through a gap in the curtains is due to the process of light diffraction. Light waves bend as they pass through the gap, creating a visible pattern of light and shadow on the surface where it hits.
What instrument is used to find out the weight of bag of potato?
A scale, such as a kitchen scale or industrial scale, is typically used to find out the weight of a bag of potatoes. The bag is placed on the scale and the weight is displayed, allowing for an accurate measurement of the potatoes.
The size of a quantity is called?
The size of a quantity is called its magnitude. Magnitude refers to the numerical value or amount of a quantity, often indicating its scale or extent. In mathematics and physics, magnitude is used to describe the size or intensity of a vector, scalar, or physical property. It is an important concept in various scientific disciplines for quantifying and comparing different values.
Well, "cave man" is kind of a misleading term. Very few of our cousins and ancestors actually spent much time in caves. For one thing, there just aren't enough caves placed where you can use them. We get the idea from a handful of cave sites which, by managing to remain undisturbed for millennia, still contain artifacts of primitive man, famously wall paintings.
The current thinking on human prehistory runs something like this:
1. Between 8 and 6 million years ago, our line separated from that of the apes. They went on evolving and so did we, but in different directions (This answers the Creationist's question, "If Men came from Apes, why are there still Apes?")
2. Around 3 million years ago, a creature we've dubbed Homo habilis ("handy man") passed through a sort of body-building phase to become Homo ergaster ("working man") and then Homo erectus ("upright man"). This last is a bit of a misnomer, since H. habilis had - we later learned - mastered the erect posture, but the name, once given, stuck.
3. Homo erectus left Africa (did I mention this was all going on there?) and populated the rim of the Indian Ocean.
4. Folks back in Africa kept on evolving and produced Homo heidelburgensis ("man from Heidelburg," 'cause that's where we found the first skull). H. heidelburgensis gave rise to Homo sapiens neanderthalensis (the "smart man from Newman's valley, better known as Neanderthal Man.)
5. H. sapiens neanderthalensis left for Europe around 750,000 years ago, while back in Africa, another child of H. heidelburgensis was developing into Homo sapiens sapiens(double smart man," also known as us).
6. Some 50,000 years ago, give or take a few centuries, we had tweaked the design enough to be called AMH, or Anatomically Modern Humans.
7. We (that is, our AMH ancestors) enterred Europe about 35,000 years ago and shortly thereafter (ca. 28,000 years ago) the Neanderthals disappeared, leaving us as the sole human species. [Actually, there was another one over in Indonesia, Homo floresiensis ("man from Flores," aka the Hobbit), but we didn't know about him until this century.]
8. Some of those AMH provided the evidence for "cave man" [which would be Homo speleus if that were a real classification].
What is difference between a mechanical stopwatch and an electronic stopwatch?
A mechanical stopwatch can measure a time interval of up to 0.1 seconds. It has a knob that is used to wind the spring that powers the watch. It can also be used as a start-stop and reset button. The watch starts when the knob is pressed once.
The Electronic Stopwatch keeps time for an unlimited number of splits and registers 1/100th for the first 30 seconds, and 1 second . thereafter for up to 24 hours. It includes a programmable alarm, and displays the current date, time and month.
What is the density of a cube if each side is 2 cm and the mass is 16 grams?
Oh, dude, you're hitting me with some math here! So, the density of the cube is the mass divided by the volume. Since the cube has equal sides, the volume is just side cubed, which is 2 cm x 2 cm x 2 cm. That gives you a volume of 8 cubic cm. Divide the mass (16 grams) by the volume (8 cubic cm), and you get a density of 2 grams per cubic cm. Like, easy peasy, right?
What other types of equipment might b used to improve the dissection of a pig?
Some equipment that could be used to improve the dissection of a pig include surgical scissors for precise cutting, forceps for handling small tissues, a scalpel for incisions, and a dissecting probe for exploring anatomical structures. These tools can help make the dissection process more efficient and accurate.
Does liquid have definite mass?
Yes, liquid has a definite mass. Mass is a measure of the amount of matter in an object, and liquids have mass because they are made up of molecules that have mass. The mass of a liquid can be measured using a scale.
Which is more dense cream or milk?
Cream is more dense than milk because it has a higher fat content. The fat molecules in cream are larger and heavier, causing them to take up more space and create a denser substance compared to milk. This is why cream floats on top of milk when left undisturbed.
What are the advantages and disadvantages of wet mount?
Advantages:
- Quick preparation: specimen fixation, dehydration and staining are not necessary (but possible, if required). For this reason, wet mounts are the first kind of mounts that students learn to make.
- Few artifacts: If there is no chemical and physical processing of the specimens before observation (no fixation), there are little artifacts and the specimens appear in their natural condition.
- Living and moving: It is possible to observe living and moving organisms. It is also possible to observe certain processes of life, such as feeding, cell division etc. (for water-based mounts)
- Natural colors: The colors are natural and not faded. The colors of permanently mounted specimens may fade over time.
Disadvantages of wet mounts include:
- Movement: The advantage of observing movement can also be a disadvantage. Due to the movement of the organisms it may be more difficult to take pictures or to make drawings. There is a solution to this problem: one can slow down ciliates and other protozoa by adding a solution, which increases the viscosity of the water.
- Evaporation: The heat of the lamp causes the water to evaporate more quickly. More water must be added under the cover glass from time to time.
- Focus: Some organisms may swim vertically in the water and therefore move in and out of focus. Here it is important not to use too much or too little water. Too little water may squeeze the specimen between cover glass and slide.
- Storage: Wet mounts can not be stored over a longer time.
How much space would 1 kg of air occupy?
Because a kilogram is a unit of mass and not weight, a one kilogram object on Earth would still be one kilogram on Jupiter. A measure of weight using SI units is the Newton. The gravitational acceleration on earth is 9.8 meters per second squared. We can get the weight of an object on Earth by the equation: Mass X Gravitational Acceleration = Weight (m/g = w) A 1 kg object on Earth would weigh (1 kg) X (9.8 m/s^2) = 9.8 Newtons The gravitational acceleration on Jupiter is 24.79 m/s^2 therefore a 1 kg object would weigh: (1 kg) X (24.79 m/s^2) = 24.79 N
True or false a boiling point is a chemical property of a substance?
False. A boiling point is a physical property of a substance, not a chemical property. Chemical properties describe how a substance interacts with other substances to form new substances, while physical properties are characteristics that can be observed or measured without changing the substance's chemical composition. Boiling point is the temperature at which a substance changes from a liquid to a gas at a given pressure, which is a physical characteristic.
What element is known as jove's metal?
Oh, dude, that's an easy one. Jove's metal is just another fancy way of saying tin. Yeah, like, back in the day, tin was associated with Jupiter, who is also known as Jove in Roman mythology. So, yeah, it's just tin, nothing too crazy.
