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Physics

Physics regards the physical aspects of the natural world. It includes topics that deal with forces on different bodies within the universe and phenomena that explain how the universe works.

500 Questions

Is an airplane a simple machine?

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An airplane is not a simple machine. A lever is a simple machine. A wheel is a simple machine. Any machine that can be described by a mathematical formula is a simple machine.

Which science is the most complex chemistry or biology or physics?

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The most complex science between the 3 is biology followed by chemistry and next is physics.

This is because Biology as a science encompasses the nature and laws of life (scientifically), which means that as a science that studies life it ranges from the microscopic to macroscopic level of understand and acquiring knowledge about life. Biology in microscopic level includes the study of the cells, its components and the macromolecules that makes up for each components , how they work and what makes an organism alive up to the macroscopic level that includes the ecology understanding how organism interact with each other and with their environment, how environmental changes drives evolution and how evolution changes the way life goes with the living organisms. Hence, biology includes both understanding the science of chemistry and physics.

Does ice float or sink?

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Ice floats on water. This is because ice is about 9% less dense than liquid water. When water freezes, it expands and becomes less dense than its liquid form. Therefore, a liter of ice weighs less than a liter of water, and the heavier water displaces the lighter ice, causing it to float¹². This unique property of water allows ice to float on top of liquid water rather than sink.

Can bluetooth travel through walls?

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Bluetooth signals can travel through walls to some extent, but the ability to penetrate walls depends on various factors, including the material of the walls, the signal strength, and the specific Bluetooth version.

Bluetooth signals operate in the 2.4 GHz frequency range, which is a relatively high frequency. Higher frequencies generally have more difficulty penetrating obstacles like walls compared to lower frequencies. As a result, Bluetooth signals may experience some attenuation when passing through walls, reducing the signal strength on the other side.

Materials also play a significant role. Some building materials, like concrete and metal, are more effective at blocking Bluetooth signals than materials like drywall or wood. The thickness and density of the walls will also impact signal penetration.

Bluetooth devices typically have a specified range (e.g., 10 meters or 30 feet for Bluetooth Class 2 devices) under ideal, open-air conditions. When walls or other obstacles are introduced, this range can be reduced.

Newer Bluetooth versions, such as Bluetooth 5.0 and later, generally offer improved range and better wall penetration compared to earlier versions. They may use features like enhanced data rates and increased output power to achieve better performance.

In summary, while Bluetooth signals can travel through walls to some extent, the signal strength and range may be affected by the materials and thickness of the walls. If you are experiencing connectivity issues, consider the physical environment and the specific Bluetooth version of your devices.

What are highly flammable gases?

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Gases that are flamable Gases that can easily catch on fire There are numerous highly flammable gases. Some of the most common include butane, hydrogen, ethylene, methane, ammonia, acetylene, and propane.

How is constant linear velocity achieved in a CD?

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تستخدم محركات الأقراص المضغوطة آلية تعمل على إبطاء القرص عندما يكون شعاع الليزر بالقرب من مركز القرص وتسريع القرص عندما يكون شعاع الليزر بالقرب من الحافة الخارجية.

What is the weight of a 42 kg object if the object was on the moon where g is always 1.6 ms?

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The mass of an object does not depend on gravitational pull. Their mass would still be 42 g on the moon.

(By the way, that's one small person, with the mass of about 3 empty soda cans...)

When a wire is pulled it is said to be in?

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Compression

If a force of 100 newtons was exerted on an object and no work was done the object must have?

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The object must be stationary.

Work done happens when the object is moving in the direction of the force- if it is staying still, there is no work done!

What is 80g in newton?

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To convert grams (g) to Newtons (N), you need to use the formula:

1 Newton (N) = 1,000 grams (g)

So, to convert 80 grams to Newtons:

80 grams * (1 Newton / 1,000 grams) = 0.08 Newtons

Therefore, 80 grams is equal to 0.08 Newtons.

Falling rock signs mean what?

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Look out for falling rocks.

The area along the road is unstable and rocks could fall loose onto the roadway.

The sign is warning that you should be vigilant for objects in the road.

Can a particle with zero acceleration spead up?

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When it has zero acceleration, it is moving at a constant velocity.

If you change that velocity then it is accelerating.

Remember velocity is a constant speed in a given direction.

If the direction changes, then its velocity is changing hence it is accelerating.

That's why if you go round in a circle , e.g. a fairground ride, your velocity is changing, hence you are accelerating, and so feel as though you are going to be thrown outwards.

Remember Sir Isaac Newton's three laws of Universal Dynamics.

  1. A body/mass will remain stationary or in uniform motion, unless acted upon by a force.

  2. Force is directly proportional to body/mass and acceleration.

  3. To every force there is an equal and opposite force.

Is Liquid water less dense or more dense?

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Liquid water is more dense than ICE , and More dense than water vapour(steam).

Liquid water is at its most dense at 2 oC.

Water on freezing to ice expands by about 10% of its volume. This is because of the lattice arrangement of water molecules in ice., which does not occur in liquid water., Hence ice floats on water. (icebergs).

What force is exerted on 2.5 meters squared if the pressure is 99500 pascals?

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The basic S>I> units for Pascals, is kg m s^-2 / m^2 . That is Force divided by Area.

Hence

Pressure(Pa) = force/ area.

Algebraically rearraning

Force = Pascals X Area.

Hence

Force = 99500 X 2.5 = 248750 kg m s^-2 ( Newtons).

Do humans float on water?

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YES!!!

Human density is 0.97 of 100 for water.

So since we are less dense than water , we will float.

Added to which nature gives us a pair of 'water wings' , they are called 'lungs'.

Yes!!! you can lie on the surface of water, but because our density is slightly less than watert , most of the human organism will immerse in water, but enough is left above the surface of water, for us to breath.

How will an unbalanced force in the direction opposite motion affect an object's motion?

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Alice Rubby, the expert of Dissertation Writing Services, whose commitment to academic excellence and unwavering support has left an indelible mark on the scholarly landscape. Join us in exploring the wealth of knowledge and expertise that Alice brings to the world of academic writing, transforming challenges into opportunities for educational growth and success.

What type of simple machine is a Knife blade?

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A knife blade can be considered a type of simple machine known as a wedge. In simple machines, a wedge is used to separate or lift objects by applying force to push them apart. In the case of a knife blade, the sharp edge of the blade tapers to a point, forming a wedge shape. When the blade is pressed against an object with sufficient force and motion, it creates a concentrated area of pressure, allowing it to pierce, cut, or slice through the material.

By applying force to the handle of the knife, the wedge-shaped blade concentrates that force onto a small area, enabling it to penetrate and separate the material being cut. This principle is fundamental to the function of knives and other cutting tools, making them essential for various tasks in cooking, crafting, construction, and many other applications.

What does mv2 mean?

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What is visual background over which all your work is done?

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A modeling portfolio

What energy is produced in a nuclear power station?

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the "disappearance" of a small amount of mass

What is vectors real name?

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The word 'vector' is from Latin, and means 'to carry'.

Why does momentum have a direction?

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Because momentum is mass X velocity.

Velocity has direction, otherwise it is speed.

What happens to the velocity of a moving body if you change the direction in which the body is moving?

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It depends how you changed the direction of the body. If the body is hit by an external force in the direction of motion, the velocity should increase. If the body is hit by an external force in the opposite direction of motion, velocity will decrease.

If a moving body comes to a stop what will be it's final velocity?

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If an object doesn't move, then its velocity is zero.