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.
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.
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.
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.
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.
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.
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...)
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!
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.
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.
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.
A body/mass will remain stationary or in uniform motion, unless acted upon by a force.
Force is directly proportional to body/mass and acceleration.
To every force there is an equal and opposite force.
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).
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).
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.
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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.
the "disappearance" of a small amount of mass
Because momentum is mass X velocity.
Velocity has direction, otherwise it is speed.
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 an object doesn't move, then its velocity is zero.