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Social Sciences

The study of human society and of individual relationships in and to society.

5,538 Questions

How can a bimetallic strip be used to regulate temperature?

A bimetallic strip is two different metals glued together. When the temperature changes each metal expands (or contracts) but by different amounts, so the strip as a whole ends up bending. This bending property can be used to turn on (or off) a heater switch.

Is a car's speedometer show instantaneous speed average speed or velocity?

A car's speedometer typically shows the instantaneous speed, which represents the current speed of the vehicle at any given moment. It does not show average speed or velocity.

How does weather change?

Weather changes are primarily influenced by patterns in air pressure, temperature, and humidity. These changes can be caused by factors such as the movement of air masses, the interaction of warm and cold fronts, and the influence of large-scale weather systems like low pressure systems and high pressure systems. Other factors, like the presence of clouds, precipitation, and wind, can also impact how the weather changes.

Why does weather change?

Weather changes because differential temperatures cause density changes in air and water, and the resulting pressure gradients stimulate the movement of air masses. Coriolis forces contribute to the effects.

The Sun is the prime mover in all this. Sunlight heats the surface of the earth, and does so selectively because areas farther north or south do not receive the same amount of solar energy. Atmospheric effects influence the weather. Clouds reflect sunlight. Fires, volcanic action and human activity fill the air with a variety of gases and particulates that absorb or reflect more sunlight, each according to its own properties. All of this, the weather, is a dynamic process. It is in flux; it is changing. And the complexity of weather presents us with challenges in managing everything from the growth of food crops right down to planning the logistics of our daily lives.

The latitude, elevation, air pressure, cloud cover, and albedo of the surface, along with the effects of nearby water areas, are what cause the uneven heating of the Earth's surface, so that different areas will have different temperatures.

What happens when a net force acts on a object?

When a net force acts on an object, it causes the object to accelerate in the direction of the force. The acceleration of the object is directly proportional to the net force applied and inversely proportional to the mass of the object, as described by Newton's second law of motion.

Which is closer to the equator Sahara or Colombia?

Colombia.

Colombia lies across the equator in northern South America, from about 12° N down to 4° S latitude. Almost all of the Sahara is north of the Tropic of Cancer, from 23.5° N up to 33° N latitude in Africa.

What is the chemistery?

Chemistry is the scientific study of the composition of substances and their properties. It also deals with the ways in which these substances interact, combine, and change to form new substances.

Does marble weather easily?

Marble is a naturally porous and soft stone, so it is susceptible to weathering if not properly sealed and maintained. Over time, exposure to elements such as sunlight, water, and temperature changes can cause erosion and discoloration of the surface. Regular sealing and cleaning can help to preserve the appearance and longevity of marble.

How do you know that yeast is alive?

You can tell yeast is alive when it starts to ferment, producing bubbles and releasing carbon dioxide, which causes dough to rise. Another way is to observe its growth and reproduction under a microscope or by seeing it consume sugar and produce ethanol and carbon dioxide.

A force you exert towards you?

An example of a force you exert towards you could be pulling an object towards yourself, such as pulling a book off a shelf towards you. This force is known as a tensile force and is directed towards the individual applying the force.

Why is water loss reduced in the lungs in hot weather yet it is the highest in long heavy exercise?

In hot weather, the body may prioritize cooling mechanisms such as sweating over water loss through respiration in order to maintain core temperature. During long, heavy exercise, the increased breathing rate and depth leads to more water loss through respiration as the body works to meet the increased oxygen demand for energy production.

Why is the beaver important?

Beavers are important for their role in ecosystem engineering. They create wetland habitats that benefit a wide variety of plant and animal species, help control flooding by building dams, and improve water quality by filtering pollutants. Their activities contribute to the overall health and biodiversity of ecosystems.

What happens when you put a bimetallic strip in the flame of a burner?

When a bimetallic strip is exposed to the flame of a burner, the two metals in the strip expand at different rates due to their differing coefficients of thermal expansion. This causes the strip to bend as one side expands more than the other, demonstrating the principle behind the bimetallic strip's use in thermostats and temperature-regulating devices.

What is lab pack?

A 'lab pack' is a hazardous waste disposal term used to describe a container - typically a 55 gallon fiber or steel drum - filled with various small quantity containers of compatible laboratory chemicals. The small containers within the drum are usually packed in vermiculite or other inert packing material to allow safe transport of the waste chemicals.

How are si units for volume and density derived from si units for length and mass?

The unit of volume (cubic metre) is derived quite easily from the unit of length (metre). Imagine a cube whose edges are all one metre long - the volume of this cube is one cubic metre. Any volume can be expressed as multiples of this (e.g. 6 cubic metres), or as a fraction of this (e.g. 0.25 cubic metres).

One thousandth of a cubic metre is called a a "cubic decimetre" or a "litre" (a decimetre being one tenth of a metre). If you have one cubic decimetre of water, its mass is one kilogram, as originally defined. This makes the density of water equal to exactly 1 kilogram per cubic decimetre (1 kg dm-3), or 1000 kilograms per cubic metre (1000 kg m-3). All other densities are measured relative to that, so if a substance has a density of 2 kg dm-3, it is twice as dense (heavy for its size) as water.

Water is used as a liquid that we are all familiar with, and we kind of know from our everyday lives how heavy it is going to be, judging from how much of it there is, (assuming it is a relatively small quantity).

What is kenitic energy?

Kinetic energy is the energy possessed by an object due to its motion. The amount of kinetic energy an object has is dependent on its mass and its velocity. The formula for calculating kinetic energy is: KE = 0.5 x mass x velocity^2.

What is the behavior of metal listeners?

It's hard to generalize ALL metal listeners to having the same or even similar behaviours while listening to metal. Some people believe that metal listeners get "high" listening to metal and just start feeling angry and suddenly wanting to do destructive/evil things. Others believe they are mostly kids that hate everything (school, parents, etc) and therefore listen to metal as a way of feeling like they belong somewhere.

On the other hand, there are studies that show intelligent people (students) who receive high grades in school listening to metal to cope with their stress. Their behavior while listening to metal may be akin to any ordinary person listening to "ordinary" music.

Therefore, the behaviour of listening to metal not something you can identify on the whole but dependent on the individuals themselves.

I personally enjoy metal as as an alternative to my other musical tastes such as electronic, rock, indie, jazz, and occasionally classical (depending on my mood). When I feel upset or angry, it is not unlikely for me to listen to metal if I were to choose. Will I be influenced by the I am hearing on the spot??? Let's hope you're not around me then.....

;)

Three examples of liquid?

Anything can become a liquid if condensed from a gas to a liquid, or melted from a solid to a liquid. If you are asking about 3 items that liquid on earth, at average temperature:

1) Water

2) Bromine

3) Mercury

How much rain must an area receive in a year to be considered a rainforest?

A rainforest is not defined exclusively by the amount of rain it gets. There are other factors (average temperature, layers of overgrowth) that are characteristic of rainforests, either tropical or temperate. However, the general range for the classification is more than about 1750 to 2000 mm (68-78 inches) of annual rainfall.

Example of light energy?

Sunlight is an example of light energy. It is produced by the sun and travels in the form of electromagnetic waves, providing illumination and heat to the Earth.

What kinds of buildings are most at risk from lightning strikes Why?

Answer The tallest buildings in the area because the lightning only has a short length to travel before coming into contact with something.Having a lightning rod also increases the chance of lightning striking. The tallest buildings in the area because the lightning only has a short length to travel before coming into contact with something.Having a lightning rod also increases the chance of lightning striking. The tallest buildings in the area because the lightning only has a short length to travel before coming into contact with something.Having a lightning rod also increases the chance of lightning striking.

What is heat enrgy?

Heat energy is a form of energy that is transferred between objects due to a difference in temperature. It is the energy associated with the random motion of particles in a substance. Heat energy flows naturally from hot objects to cold objects until thermal equilibrium is reached.

Why was GPS system invented?

War, plain and simple. It was designed to allow smart bombs and cruse missiles to hit their targets accurately. It was also developed for military deployment of troops and equipment. It was also invented to give directions to lost pedestrians.