A hole is drilled in a metal plate. When the metal is raised to a higher temperature, what happens to the diameter of the hole? (a) It decreases. (b) It increases. (c) It remains the same. (d) The answer depends on the initial temperature of the metal. (e) None of those answers is correct.

The concept of fracking (or hydraulic fracturing) is related to extracting oil and natural gas from underground shale formations.

Hydraulic fracturing is a technique used to extract oil and natural gas from underground shale formations by injecting a mixture of water, sand, and chemicals into the rock under high pressure.

This process creates small fractures in the rock, which allows the oil and gas to flow more freely.

Fracking has become a controversial topic due to concerns about its environmental impact, including potential water contamination and the release of greenhouse gases.

Despite these concerns, fracking has become a significant source of oil and natural gas in the United States, helping to reduce dependence on foreign sources of energy and boosting domestic production.

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If a hydraulic press multiplies a force by a 100, This multiplication is done at the expense of  energy, which decreases by a factor. Option B is correct.

A hydraulic press multiplies force by applying pressure to a confined liquid, such as oil or water. This pressure is transmitted equally throughout the liquid, resulting in a larger force being exerted at the output piston than the input piston.

However, this multiplication of force comes at the expense of energy, which decreases by a factor due to the conversion of some of the energy into heat or other forms of energy during the process. The distance through which the force acts and the time over which the force acts remain the same, so they are not the source of the multiplication of force.

Similarly, the mechanism providing the force is not affected by the hydraulic press. Thus, the correct option is D.

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Norepinephrine can be viewed as a Neurotransmitter or a chemical, contingent upon what discharges it and how far it should go to arrive at a receptor. It is true.

A neurotransmitter is the hormone norepinephrine, also known as noradrenaline. It is a chemical messenger that, as a neurotransmitter, aids in the transmission of nerve signals to another nerve cell, muscle cell, or gland cell across nerve endings.

A neurotransmitter is a molecule that a neuron secretes to influence another cell at a synapse. The cell that is receiving the signal—the target cell—could be a muscle or gland cell or another neuron.

Dopamine is the source of the neurotransmitter norepinephrine. Nerve cells in the brainstem and a region close to your spinal cord produce norepinephrine.

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Answer:

change 20 min into hr = 0.33 hr

Explanation:

convert= divide the time by 60 because 60 mins make 1 hr

Global warming is mainly caused by the greenhouse gases. If industries take actions to reduce the evolution of these gases, global warming can be decreased a lot. To reduce these gases they have to plan for proper waste management and gas testing steps.

Global warming is the geographical process of warming up of the earth's surface and as a result ecosystems will be disordered and snow hills are starting to met leading to rise in sea level.

The main cause of global warming is the greenhouse gas effect. Greenhouse gases are methane, carbon dioxide, oxides of nitrogen and sulfur. They will intensely absorb heat from the atmosphere and warm up the surface of earth.

Evolution of carbon dioxide from factories should minimized by proper strategies. Similarly catalytic reactions and alternative chemicals for carbon dioxide and oxides of sulfur and nitrogen can be used to minimize global warming.

Burning of plastics and fossil fuels have to be reduced and proper waste management have to be planned by the industries.

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Answer:

Vectors are often represented by arrows. When using an arrow to represent velocity, the length of the arrow stands for speed, and the way the arrow points indicates the direction.

Answer:

A few of the positive particles aimed at a gold foil seemed to bounce back.

Explanation:

Answer:

The answer is A: A few of the positive particles aimed at a gold foil seemed to bounce back.

Explanation:

This is Bohr's model, and this is what his discovery was: that, when he conducted several experiments, he found that the positive particles bounced off of the gold foil.

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The value of speedmph after calling the function calculatemph, given that distancemiles equals 1870, timesecs equals 343440, and speedmph equals 55.0, cannot be determined without further information.

The function calculatemph is not defined, and there is no information provided about how it operates or what its purpose is. Without knowing the specific calculations or transformations performed by the calculatemph function, it is not possible to determine the resulting value of speedmph after calling it.

To determine the value of speedmph after calling calculatemph, we would need additional information about the function's implementation or any relationships between the given variables. Without this information, it is not possible to provide a specific answer.

If more details or the actual implementation of calculatemph were provided, it would be possible to analyze the function and determine its effect on the value of speedmph.

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We only need to multiply 5V by the amount of current the device is drawing from the port because power is equal to current times voltage.

Although the USB port is only designed to handle electricity up to 5 A, certain manufacturers may offer a higher maximum current.

The potential difference in charge between two sites in an electrical field is quantified as voltage, also known as electromotive force.

The amount of charge carriers that pass a fixed point in a unit of time via a conducting or semiconducting medium for a certain flow resistance increases with voltage, i.e., the number of charge carriers that pass a fixed point in a unit of time.

Therefore, We only need to multiply 5V by the amount of current the device is drawing from the port because power is equal to current times voltage.

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G2-type stars take the longest time, while O9-type stars take a shorter time to go from a protostar to a main-sequence star during the formation process.

Based on the spectral types provided, the order of the stars from the longest to the shortest time taken to go from a protostar to a main-sequence star during the formation process is as follows:
1. G2
2. O9
- Stars with lower masses, like G2-type stars, take longer to form because they have a lower rate of fusion and lower pressure at their cores.
- On the other hand, O9-type stars have a higher mass, which results in a higher rate of fusion and higher pressure at their cores.

This means they will form faster than G2-type stars.

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Answer:

2.35 Nm.............. .

Answer:

C

Explanation:

( I dun know how to explain it ‍ but i do know that the answer is C. Saw it in a past paper.)

Answer:

970 kN

Explanation:

The length of the block = 70 mm

The cross section of the block = 50 mm by 10 mm

The tension force applies to the 50 mm by 10 mm face, F₁ = 60 kN

The compression force applied to the 70 mm by 10 mm face, F₂ = 110 kN

By volumetric stress, we have that for there to be no change in volume, the total pressure applied by the given applied forces should be equal to the pressure removed by the added applied force

The pressure due to the force F₁ = 60 kN/(50 mm × 10 mm) = 120 MPa

The pressure due to the force F₂ = 110 kN/(70 mm × 10 mm) = 157.142857 MPa

The total pressure applied to the block, P = 120 MPa + 157.142857 MPa = 277.142857 MPa

The required force, F₃ = 277.142857 MPa × (70 mm × 50 mm) = 970 kN

Answer:

gravitational force

Explanation:

ANSWER

b. adding to the internal energy only

EXPLANATION

The 1st Law of Thermodynamics states that the total change in the internal energy of a system, ΔU, is equal to the sum of the net heat transfer into the system, Q, and the net work done on the system, W,

As we can see in this equation, we can increase the internal energy of a system by adding heat to the system or doing work to the system.

So, if heat is added to a system it will increase the internal energy of the system.

Hence, the heat goes into adding to the internal energy only.

Answer:

Inertia

Explanation:

The term for the tendency is inertia.

The inertia of a body is the tendency of the body to remain unmoved when at rest and the tendency to keep moving when in motion. In other words, it is the tendency of a body to remain in a state of rest or motion.

A static body will remain in a state of perpetual rest if no force acts on it and a moving body will keep moving in the same direction if no force acts on it. The force that needs to be overcome in order to change the state of the object is otherwise known as inertia force.

Answer:

0.5 kg

-1.24 m/s

-2.10 kg•m/s

Explanation:

Answer:

Full Questions + Answers

Explanation:

Refer to your lab guide and review the data in Table F to complete each statement.

The mass of G1 at all times during this trial was

0.5

kg.

The velocity of G1 + G2 after the collision was

-1.24

m/s.

The momentum of G1 after the collision was

-2.10

kg · m/s.

Answer:

It will travel at 1 m/s2

Answer:

It will travel at 1 m/s2

Explanation:

Answer:

surrre buy me lol

Explanation:

Given that,

Initial position of the spring, x₁ = 0.25 m

Final position of the spring, x₂ = 0.1 m

The spring constant of the spring, k = 100 N/m

To find,

The elastic potential energy stored from the spring's compression.

Solution,

The work done in moving a spring from on position to another is stored in the form of elastic potential energy. It can be given as follows :

\(E=\dfrac{1}{2}k(x_2^2-x_1^2)\\\\=\dfrac{1}{2}\times 100\times (0.1^2-0.25^2)\\\\=2.62\ J\)

So, the required energy is 2.62 J.

Answer:

1.125 J

Explanation:

The correct answer is 1.125 J

Distortion (warping) is a serious problem in fusion welding, especially arc welding. Proper sequencing, welding fixtures, heat sinks, and precision cutting are all effective techniques that can be used to minimize distortion.

Distortion can lead to poor dimensional accuracy, difficulty in fit-up, residual stress, and sometimes, catastrophic failure. The following are some of the techniques that can be used to reduce the incidence and extent of distortion.

Proper sequencing: Proper sequencing is a technique that involves welding the joints in a predetermined sequence to control the magnitude and distribution of the residual stress. This technique allows the fabrication of components to minimize the effect of residual stress on the component's behavior.

Welding fixtures: Fixtures are used to hold parts in place during welding. By using welding fixtures, the extent of welding distortion can be controlled. Fixtures should be designed so that they restrain the components' movement during the welding process so that the component's dimensional accuracy is maintained.

Heat sinks: Heat sinks are devices used to conduct heat away from a welded joint. By controlling the heat input, heat sinks minimize the amount of residual stress and distortion associated with welding. The use of heat sinks results in a more uniform temperature distribution, which in turn leads to a reduction in the magnitude of residual stress and the extent of welding distortion.

Precision cutting: Precision cutting is a technique that involves precise and accurate machining of the components before welding. This technique ensures that the components' dimensional accuracy is maintained even after welding. Precision cutting can minimize the effects of distortion by eliminating the need for welding repairs, which can cause further distortion.

In conclusion, distortion is a serious problem in arc welding. However, there are several techniques that can be used to reduce the incidence and extent of distortion, including preheating, controlling the welding process, and post-welding heat treatments.

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Answer:

=> Rheostat is an electric device used as a variable resistance, like the regulator of the fan. It is used to change the electric resistance in the electric circuit.

=> Rheostat works on the principle of Ohm’s law. Ohm’s law states that current in a circuit is inversely proportional to the resistance at the given temperature.

\( \infty \infty \infty \)

The statement that explains how ocean-currents affect global climates is: "Water absorbs a lot of thermal energy and releases it over time and distance."

The ocean-currents can be say as the continuous movement of sea water bodies in the ocean. Ocean currents are like large rivers of water flowing through the oceans.

The movement of ocean-currents has a major impact on global climate because water is a good conductor and storage of heat.

When we check the factors which affects the ocean currents to happen we have to talk about Coriolis-Effect. Coriolis Effect refers to an internal force (Coriolis) that causes the deflection of an object in motion.

Wind, water density and topography are the other major factors which directly influence the ocean currents.

Strong winds can move the water surface causing the ocean currents. About water density, more dense water will sink and that sinking water pushes the water below it up. About topography, ridge in the ocean bottom moves the water upward, while valley in the ocean moves it downward.

When ocean currents flow, they absorb large amounts of thermal energy. This energy is then transported over time and distance, affecting the temperature and climate of the regions through which the currents flow.

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Answer:

The formula for potential energy depends on the force acting on the two objects. For the gravitational force the formula is P.E. = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m / s2 at the surface of the earth) and h is the height in meters.

Explanation:

Sub to Beast_Building on yt

There are 20,971,520 strings of eight English letters that contain no vowels when letters can be repeated.To calculate the number of strings of eight English letters that contain no vowels.

we need to consider the total number of possible choices for each letter position.

In the English alphabet, there are 26 letters, including five vowels (A, E, I, O, U) and 21 consonants.

Since we want to create strings without vowels, we can choose any of the 21 consonants for each position in the string.

For each of the eight positions in the string, there are 21 choices (consonants) available.

Therefore, the total number of strings can be calculated as:

Total number of strings = Number of choices for each position ^ Number of positions

Total number of strings = 21^8 = 20,971,520

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The electromagnetic waves with an energy of \(1.5 \times 10^{-24} J\) are likely X-rays.

The energy of an electromagnetic wave is related to its frequency and wavelength by the equation:

E = hf = hc/λ

where:

E = energy of the electromagnetic wave

h = Planck's constant (\(6.626 \times 10^{-34} J s\))

f = frequency of the electromagnetic wave

c = speed of light (\(3.00 \times 10^8 m/s\))

λ = wavelength of the electromagnetic wave

Solving for λ:

λ = hc/E = \((6.626 \times 10^{-34} J s)(3.00 \times 10^8 m/s)/(1.5 \times 10^{-24} J)\)

λ ≈ \(4.40 \times 10^-8 m\)

This corresponds to a wavelength of about 44 nanometers, which falls in the range of X-rays. Therefore, the electromagnetic waves with an energy of \(1.5 \times 10^{-24} J\) are likely X-rays.

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If the electric potential is constant throughout the given region of space, then the electric field is zero in this region.

Electric potential is the amount of work done in bringing a unit positive charge from infinity to that point in an electric field, while electric field is a region in space where electric charges experience a force. So, if there is no difference in potential across a region of space, it means no work is done in moving a charge from one point to another. Hence, there is no force experienced by the charge. Therefore, the electric field is zero in this region if the electric potential is constant throughout.

Electric potential is the amount of work required to move a unit charge against an electric field from a reference point to a specific point. Usually, Earth serves as the reference point, but any point outside of the electric field charge can be used.

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