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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

Why shear force is necessary for fluid flow?

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provides energy

Name three fields that newton contributed to?

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motion,1st and 2nd law

How much tension if the bag is supported by 7 vertical strands That is how much tension is exerted in each strand Answer in units of N?

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Assuming that all strands are vertical/ parallel to gravity and equally spaced (on a radius) around the centre of gravity then tension on each strand will be equivalent to weight x 9.81 divided by 7 equals tension in Newtons.

If the strands are not normal and/or at varying distances from centre of gravity then it becomes a little more complicated. Summ of tension on strands must equal weight of bag. Tension on each strand is a ratio of it's distance from the COG of the furthest most strand. Don't forget the further from perpendicular a strand is the more tension on the strand.

What is the mechanical advantage of a lever that can lift a 100 N load with an input force of 20 N?

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The mechanical advantage is the ratio of the output force to the input force.

MA = output/input (output force divided by the input force)

For the example, 15N/30N gives the MA as 0.5 (one half).

Is instantaneous velocity a vector quantity?

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YES!!! Because velocity is speed in a given direction(vector).

e.g

30 mph is a scalar quantity, but '30 mph in a northerly direction' is a vector quantity, because it has direction.

What is loudness determined by?

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In order to find out the loudness of sound waves, an oscilloscope can be used. Oscilloscopes demonstrate sound wave patterns, but it must be hooked up to a microphone in order for it to be heard.

ADDED: It is measured directly and quite accurately by sound-level meters, and these are used by environmental-monitoring specialists etc..

You can use an oscilloscope, but not directly. That shows the sound's wave-shape as a voltage analogue, so to calculate the sound level itself from the display on the screen, you also need to know the sensitivity of the microphone and the gain of any amplifier. If you want to determine the sound's full characteristics, replace the oscilloscope by a spectrum-analyser.

Will a larger object apply more force to a smaller object?

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YES!!! Assuming the acceleration() is constant.

Then

F = Ma

&

f= ma

If M > m then F(force) > f(force)

When were the first fireworks invented?

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The First Fireworks was Invented in mainland China During The Sung Dynasty

Why does flames of acandle rises upward?

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Air in a flame is hotter, and therefore less dense. It will "float" in normal (cooler) air.

Write in standard form 378.72?

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Write in standard form 378.72

When is acceleration constant?

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We have constant acceleration all the time.

Its called gravity.

Gravitational acceleration is 9.8... m/s^2

What is one unit for heat or energy?

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Joule

What are solar panels and what they do?

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Solar panels, also known as photovoltaic (PV) panels, are revolutionary devices that convert sunlight into electricity. They play a pivotal role in harnessing solar energy for a wide range of applications, from powering homes to supplying electricity for remote locations. Here's a breakdown of what solar panels are and how they work:

1. Photovoltaic Effect: The photovoltaic effect is a fundamental component of solar panels. This phenomenon occurs when certain materials, usually silicon-based cells, absorb photons (particles of sunlight). These photons cause an electric current when they are absorbed because they release electrons from their atoms.

2. Solar Cells: Solar panels are composed of numerous solar cells connected in a grid-like pattern. These cells are typically made of silicon, which is a semiconducting material. When sunlight hits the solar cells, it excites the electrons in the silicon, generating direct current (DC) electricity.

3. Electrical Conversion: The generated DC electricity is converted into alternating current (AC) electricity through an inverter. AC electricity is what most homes and businesses use.

4. Energy Generation: The AC electricity is used directly to power electrical appliances or fed into the electrical grid, depending on the setup. When excess electricity is generated, it can be stored in batteries or credited to the grid through net metering.

5. Applications: Solar panels find applications in various sectors, including residential, commercial, industrial, and even space exploration. They are a clean, renewable source of energy that reduces reliance on fossil fuels, cuts electricity bills, and mitigates environmental impact.

6. Environmental Benefits: Solar panels are environmentally friendly, producing no greenhouse gas emissions during electricity generation. Their use contributes to reducing air pollution and combatting climate change.

7. Types of Solar Panels: There are various types of solar panels, including monocrystalline, polycrystalline, and thin film. Each type of solar panel has its advantages and suitability for specific applications.

To sum it up, solar panels are innovative devices that capture sunlight and convert it into electricity through the photovoltaic effect. They are a sustainable and eco-friendly energy solution with a wide range of applications, making them a crucial element in the transition to cleaner energy sources.

Can you see a beam of light in space?

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No, you cannot see a beam of light in space. In order for light to be visible, it needs to interact with matter and be scattered or absorbed. In the vacuum of space, there is no matter to scatter or absorb the light, so the beam itself would not be visible.

How does it feel when both pussys are rubbed together?

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This is a personal experience and may vary from person to person. Some individuals may find it pleasurable and enjoyable, while others might not. It is important to prioritize communication, consent, and mutual pleasure when engaging in any sexual activity.

How do you calculate the speed of something dropped from 30 feet in the air?

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The speed of an object dropped from a certain height can be calculated using the equation v = √(2gh), where v is the speed, g is the acceleration due to gravity (approximately 9.8 m/s^2), and h is the height. In order to calculate the speed in feet per second, you would need to convert the height of 30 feet to meters (i.e., 30 * 0.3048).

Which wave travels faster sound at 15 c sound at 30 c why?

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The speed of sound in a medium depends on the properties of the medium. Generally, sound travels faster in denser mediums, so sound at 30 c would travel faster than sound at 15 c. But without knowing the specific properties of the mediums, it is not possible to determine the exact speed difference.

How does area affect the speed of a fluid?

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The area can affect the speed of a fluid by changing the rate at which the fluid flows. In general, if the area through which the fluid flows is increased, the speed of the fluid will decrease. Similarly, if the area is decreased, the speed of the fluid will increase. This is because the volume of fluid flowing per unit time must remain constant, so if the area increases, the fluid spreads out and slows down, and if the area decreases, the fluid is forced to accelerate.

What are the colours in the visible spectrum of light?

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The colors in the visible spectrum of light are red, orange, yellow, green, blue, indigo, and violet.

What is a material that will carry an electric current called?

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A material that will carry an electric current is called a conductor. Conductor materials have high electrical conductivity, allowing the flow of electric charges with minimal resistance. Examples of conductors include metals such as copper, aluminum, and silver.

What makes a liquid in glass thermometer sensitive to a small changes in temperature?

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A liquid in glass thermometer is sensitive to small changes in temperature due to the thermal expansion of the liquid contained inside the glass tube. As the temperature increases, the liquid expands, causing it to rise up the calibrated scale of the thermometer. Conversely, as the temperature decreases, the liquid contracts, causing it to subside on the scale. This expansion and contraction of the liquid is highly responsive to even slight temperature variations, making it sensitive to small changes in temperature.

What is the flow rate setting of AFFF nozzles located in Engine Rooms?

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The flow rate setting of AFFF (Aqueous Film Forming Foam) nozzles located in Engine Rooms typically depends on the specific system and fire protection requirements. It can range from 60 to 125 gallons per minute (GPM), but it is essential to consult the manufacturer's guidelines or the system design to determine the exact flow rate setting for the AFFF nozzles in Engine Rooms.

What is the relationship between the period of time and the velocity in circular motion?

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The relationship between the period of time and the velocity in circular motion is inverse. As the period of time increases, the velocity decreases, and vice versa. This is because velocity is defined as the distance traveled per unit of time, so if the same distance is covered in a longer period of time, the velocity will be lower.

What term defined a product of mass and gravity?

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The term that defines the product of mass and gravity is gravitational force or weight.