What is energy? Choose the best answer.
O Anything that travels in the form of a wave.
O Anything that makes matter move or change.
Any object in motion.
O Anything that radiates light or heat.

The statement best describes the difference between a substance with a pH of 3.0 and a substance with a pH of 6.0 is - The substance with the lower pH has 1,000 times as many hydrogen ions per volume of water.

pH is the scale or measure for the substance about its acidic or basic strength. It ranges from 0 to 6.9 which is acidic and 7.1 to 14 which is basic.

Acidic substance has high concentration of Hydrogen ions whereas, basic substance has low concentration of hydrogen ions, however for the OH⁻ ions it is reverse.

pH = -log(\(H^{+}\)) then,  

=> 3 = -log (\(H^{+}\))

=> \(H^{+}\) =  (for pH = 3)  

=> pH = -log(\(H^{+}\))

=> 6 = -log (\(H^{+}\))

=> \(H^{+}\) = \(10^{-6}\) (for pH = 6)

 Thus, The substance with the lower pH (3) has 1000 times as many hydrogen ions per volume of water.

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Answer:

Option C

Explanation:

Hydrocarbon + Oxygen = Carbon dioxide + Water

is example of combustion reaction

Answer:

B:O

Explanation:

As acceleration is the rate of change of velocity with time, if velocity is uniform, there will be no change in it and acceleration will be zero.

Faraday's law connects induced emf in a wire loop to the change in magnetic flux, allowing the determination of the magnetic field magnitude. The magnetic field B's strength, which the loop was in, can be calculated as follows: \(B = \frac{V}{A \cdot c}\)

The magnetic flux (Φ) through the loop is given by the product of the magnetic field B and the area A:

\(\(\Phi = B \cdot A\)\)

The rate of change of magnetic flux with respect to time is equal to the negative of the rate of change of area:

\(\(\frac{{d\Phi}}{{dt}} = -\frac{{dA}}{{dt}} = c\)\)

Since the induced emf V is measured, we can equate it to the rate of change of magnetic flux:

\(\(V = \frac{{d\Phi}}{{dt}}\)\)

Substituting the expressions for magnetic flux and its rate of change, we have:

\(\(V = -\frac{{dB}}{{dt}} \cdot A\)\)

Solving for the magnitude of the magnetic field B, we get:

\(\(B = -\frac{{V}}{{A \cdot \frac{{d}}{{dt}}}}\)\)

Since dA/dt = -c, we can substitute it into the equation:

\(B = V / (A * c)\)

Therefore, the magnitude of the magnetic field B that the loop was in is given by:

\(B = \frac{V}{A \cdot c}\)

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Complete question :

A loop of wire is at the edge of a region of space containing a uniform magnetic field B⃗ . The plane of the loop is perpendicular to the magnetic field. Now the loop is pulled out of this region in such a way that the area A of the coil inside the magnetic field region is decreasing at the constant rate c. That is, dAdt=−c, with c>0.The induced emf in the loop is measured to be V. What is the magnitude B of the magnetic field that the loop was in?

Answer:

second law

Explanation:

Newton's second law explains how much motion a force creates.

Answer:

The Second law of Newton’s Laws of Motion helps us add intensity to any activity.

Explanation:

The velocity of an object is the rate of change of its displacement.

The velocity vector can be found by taking the derivative of the displacement vector. In this case, the displacement vector is given by r⃗ (t) = (at + bt³)i^ + (c - dt²)j^.

The derivative of the displacement vector is v⃗ (t) = (a + 3bt²)i^ + (-2dt)j^.

The displacement vector r⃗ (t) = (at + bt³)i^ + (c - dt²)j^ can be broken down into its x- and y-components as follows:

x-component: at + bt³

y-component: c - dt²

The velocity vector v⃗ (t) is the derivative of the displacement vector r⃗ (t). This means that the velocity vector is the rate of change of the displacement vector. In other words, it is how quickly the object is moving.

The velocity vector can be found by taking the derivative of each component of the displacement vector. The derivative of the x-component is a + 3bt². The derivative of the y-component is -2dt.

Therefore, the velocity vector v⃗ (t) = (a + 3bt²)i^ + (-2dt)j^.

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The sum of the external torques is not zero. Conservation of angular momentum is based on the principle that the total angular momentum of a system is conserved when the sum of the external torques acting on it is zero. Option (1)

In other words, the angular momentum of an isolated system is constant. Angular momentum is a vector quantity that describes the rotational motion of a body or a system of bodies around a fixed axis. It depends on the mass distribution and velocity of the rotating objects. The conservation of angular momentum is a powerful tool in physics and is used to solve problems in a wide range of fields, from mechanics to astrophysics.

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Full Question: Like linear momentum, conservation of angular momentum is a fundamental principle which can be used to solve physical problems. The angular momentum of a system may remain the same unless (select the best answer)

The Darcy-Weisbach formula is used to calculate the rate of energy loss in a pipe due to frictional losses. This formula is commonly used in the field of fluid mechanics and is based on the principle that the pressure drop across a pipe due to frictional losses is proportional to the square of the flow rate.

The formula can be expressed as follows:
ΔP = (f * L * ρ * V^2) / (2 * D)
Where ΔP is the pressure drop across the pipe, f is the Darcy friction factor, L is the length of the pipe, ρ is the density of the fluid, V is the average velocity of the fluid, and D is the diameter of the pipe.
The Darcy friction factor is a dimensionless quantity that depends on the Reynolds number, which is a measure of the fluid flow regime. For laminar flow, the friction factor is constant and equal to 64/Re. For turbulent flow, the friction factor is more complicated and depends on the roughness of the pipe wall, as well as the Reynolds number.
Overall, the Darcy-Weisbach formula is an important tool for engineers and scientists who need to design and analyze piping systems. By using this formula, they can estimate the pressure drop across a pipe and ensure that the system is operating efficiently.

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Answer:

Refer to the attachment

Answer:

If you double the force, you double the acceleration, but if you double the mass, you cut the acceleration in half.

Explanation:

you can double the net force

The volume flux inside the rectangular duct is 0.028 m³/s.

Volume flux, also known as volumetric flow rate, is a measure of the volume of fluid passing through a given area per unit time. It is commonly expressed in cubic meters per second (m³/s). To calculate the volume flux in the given scenario, we can use the formula:

Volume Flux = (Air flow rate) / (Cross-sectional area)

First, we need to calculate the cross-sectional area of the rectangular duct. The area can be determined by multiplying the length and width of the duct:

Area = (138 mm) * (346 mm)

To maintain consistent units, we convert the dimensions to meters:

Area = (138 mm * 10⁻³ m/mm) * (346 mm * 10⁻³ m/mm)

Next, we can calculate the air flow rate using the given information. The air flow rate is given as 17 N/s, which represents the mass flow rate. We can convert the mass flow rate to volume flow rate using the ideal gas law:

Volume Flow Rate = (Mass Flow Rate) / (Density)

The density of air can be determined using the ideal gas law:

Density = (Pressure) / (Gas constant * Temperature)

where the gas constant (R) is given as 28.5 m/K, the pressure is 112 kPa, and the temperature is 20 degrees Celsius.

With the density calculated, we can now determine the volume flow rate. Finally, we can divide the volume flow rate by the cross-sectional area to obtain the volume flux.

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Answer:

11772 N

Explanation:

\(\boxed{w = mg}\)

w= weight

m= mass

g= acceleration due to gravity

The acceleration due to gravity on earth is 9.81m/s².

Substitute m= 1200 and g= 9.81 into the formula:

w= 1200(9.81)

w= 11772 N

The normalized deflection is given as yEl/ wLvs.x/L = (1/24 EI) [x3 - 3L2x2 + 2L3x].

The deflection of the beam can be determined using the following formula:

y(x) = (W0 L3 sin phi/24 EI) [x3 - 3L2x2 + 2L3x], where

- EI is the flexural rigidity of the beam.

The normalized deflection is given as yEl/ wLvs.x/L. Therefore, substituting the given values of the load distribution and using the above formula,

the deflection of the beam is:y(x) = (W0 L3 sin phi/24 EI) [x3 - 3L2x2 + 2L3x]

Normalized deflection, yEl/ wLvs.x/L = (W0 L2 sin phi/24 EI) [x3 - 3L2x2 + 2L3x] / W0 L2/Lvs.x/LyEl/ wLvs.x/L = (1/24 EI) [x3 - 3L2x2 + 2L3x]

Therefore, the deflection of the beam is given as y(x) = (W0 L3 sin phi/24 EI) [x3 - 3L2x2 + 2L3x] and the normalized deflection is given as yEl/ wLvs.x/L = (1/24 EI) [x3 - 3L2x2 + 2L3x].

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The particles of water will be moving the fastest in steam. Steam is the gaseous form of water, which occurs at temperatures above 100 degrees Celsius (212 degrees Fahrenheit). In this state, the water molecules have the highest amount of energy, and they move rapidly and freely in all directions.

When water is heated and reaches its boiling point, the energy supplied to the molecules causes them to overcome the attractive forces between them, leading to the transition from a liquid to a gas. As steam, the water molecules have gained enough energy to break free from the liquid phase and exist as individual molecules in the gaseous state.

On the other hand, at lower temperatures, such as 25 degrees Celsius (77 degrees Fahrenheit), water is in its liquid state. While the particles still possess kinetic energy and are in constant motion, their movement is comparatively slower than in steam. The intermolecular forces in the liquid state are stronger than in the gaseous state, allowing the molecules to stay closer together and move more sluggishly.

Ice, which is water in its solid state, has the slowest particle movement among the given options. At temperatures below 0 degrees Celsius (32 degrees Fahrenheit), the water molecules form a rigid lattice structure, and their movement is restricted to vibrations in fixed positions. The particles in ice have the least amount of energy and exhibit the least mobility.

Therefore, considering the given options, steam is the state of water where the particles are moving the fastest due to the high temperatures and increased molecular energy.

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Answer:

a. applied science

Explanation:

\(.\)

Answer:

Explanation:

The density of gold is 19.3 g/cm³. Thus, you can determine the density of the unknown cube by doing the following. Get a measuring cylinder (marked in cm³) that contains a certain volume of water (preferably above average but not close to been filled up). Get a weighing balance (that can read in grams) also.

Measure the mass of the unknown stone (using the weighing balance) and record. Take the initial volume of the water in the measuring cylinder and record (in cm³) and then drop the unknown stone inside the measuring cylinder gently (avoid splashes). Record the final volume of the cylinder after the unknown stone was dropped.

Then calculate the density of the stone by using the formula; mass ÷ change in volume

The change in volume can be determined by; Final volume - initial volume

If the answer obtained from the calculation (of the density of the stone) is not around 19.3 g/cm³ (say 19.3 ± 0.2), then the stone is not gold but if it is around 19.3 g/cm³, then the stone is gold.

Answer:

The build up of electric charges on an object is called static electricity

Answer:

A distance-time graph shows how far an object has travelled in a given time. It is a simple line graph that denotes distance versus time findings on the graph. Distance is plotted on the Y-axis. Time is plotted on the X-axis

Explanation:

Answer:

what are the answer choices

Explanation:

i dont know the choices so i say count the stuff they recycle, and add the score to the days before.

The type of star supported by electron degeneracy pressure is White Dwarf. So, option B is correct.

Electron degeneracy pressure is a quantum mechanical effect that occurs when the density of matter becomes extremely high. In white dwarfs, which are the remnants of low to medium mass stars, the core is composed of degenerate electrons. As the star exhausts its nuclear fuel, it undergoes gravitational collapse, but electron degeneracy pressure prevents further collapse by exerting an outward force.

This pressure arises due to the Pauli exclusion principle, which states that no two electrons can occupy the same quantum state simultaneously.

On the other hand, A. Brown Dwarfs and C. Red Dwarfs are supported by gas pressure, where the outward force is generated by the thermal motion of gas particles. These types of stars have lower masses and do not have sufficient density to initiate electron degeneracy.

D. Neutron Stars, on the other hand, are supported by neutron degeneracy pressure, not electron degeneracy pressure. Neutron stars are extremely dense and result from the gravitational collapse of massive stars. In these stars, the core is composed of degenerate neutrons, and it is the repulsive neutron degeneracy pressure that prevents further collapse.

Therefore, the correct answer is B. White Dwarf.

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The first extrasolar planets were so surprising that they forced a change in our theory of planet formation because they were massive like Jupiter but very close to their host star.

Extrasolar planet, also known as exoplanet, any astronomical body located outside the solar system that orbits a star other than the Sun.

Historically, the majority of extrasolar planets discovered appear to have been massive planets orbiting extremely close to their host stars. Astronomers were surprised by these "hot Jupiters," because planetary evolution theories predicted that such large planets should form only at great distances from stars. However, as time passed, more planets of various types were discovered, and it is now clear that hot Jupiters are the absolute minority of extrasolar planets.

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According to past research, women have engaged in token resistance, which means they said no but then changed their minds and said yes. This occurs because of the cultural expectations that women are supposed to resist sexual advances even if they want to participate.

Because of this, women may feel pressure to refuse initially to maintain their reputation and avoid being seen as promiscuous. However, once the partner persists, they may give in to avoid being seen as too difficult or cold-hearted. Research has indicated that these behaviours are particularly evident in situations where the individual feels vulnerable or feels that they are in a low-power position. Women may also engage in token resistance to test their partner's sincerity and willingness to respect their boundaries. Additionally, it's worth noting that token resistance does not apply only to women, as men may also engage in this behaviour.

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Answer:

D

Explanation:

All human cells contain mitochondria, which function as the cell's main "power generator" by transforming energy from food into a form the cell can use. Mitochondria are found in the cytoplasm of all human cells.

How do a generator and a mitochondria compare?

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The equation F=ma, where F is the net force, m is the mass, and an is the acceleration, can be used. . Rearranging the formula to solve for mass, we get m=F/a. Substituting the given values, we get m=12 N/48 m/s^2 = 0.25 kg. Therefore, the answer is A) 0.25 kg.

To solve this problem, you can use Newton's second law of motion, which states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration (F = ma). In this case, the net force (F) is 12 N, and the acceleration (a) is 48 m/s². You are asked to determine the mass (m) of the hockey puck.

Using the equation F = ma, you can rearrange it to find the mass: m = F/a

Plug in the given values: m = 12 N / 48 m/s²

Calculate the mass: m = 0.25 kg

The mass of the hockey puck is 0.25 kg, which corresponds to option A.

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Don't forget to make brainliest answer

-

a) Here is a sketch of the velocity-time graph for the motion described:

```

| _________

v (m/s)| / \

| / \

| / \

| / \

|___/__________________\___

t=0 15s 3min 3min 30s

```

b)

i. The highest velocity reached by the car is the velocity it travels at during the uniform motion phase, which is constant at the end of the acceleration phase. We can find this velocity using the equation:

v = u + at

where u is the initial velocity (10 m/s), a is the acceleration (1 m/s^2), and t is the time taken to accelerate (15 s).

v = 10 + 1(15) = 25 m/s

So the highest velocity reached by the car is 25 m/s.

ii. The time spent decelerating can be found using the equation:

v = u + at

where v is the final velocity (0 m/s), u is the initial velocity (25 m/s), a is the deceleration (unknown), and t is the time taken to decelerate.

0 = 25 + a(t)

t = -25/a

We know that the distance travelled during deceleration is 500 m, so we can also use the equation:

s = ut + 0.5at^2

where s is the distance travelled (500 m), u is the initial velocity (25 m/s), a is the deceleration (unknown), and t is the time taken to decelerate (from above).

500 = 25(-25/a) + 0.5a(-25/a)^2

500 = -625/a + 3125/a

500a = 3125 - 625

a = 5 m/s^2

Substituting this value of a back into the expression for t, we get:

t = -25/5 = -5 s

Since time cannot be negative, we take the absolute value of t:

t = 5 s

So the time spent decelerating is 5 seconds.

iii. The distance between the speed limit sign and the checkpoint is the sum of the distances travelled during each phase of the motion:

s = ut + 0.5at^2 (for acceleration phase)

s1 = 10(15) + 0.5(1)(15)^2 = 187.5 m

s2 = vt (for uniform motion phase)

s2 = (25)(3)(60) = 4500 m

s3 = vt + 0.5at^2 (for deceleration phase)

s3 = (25)(0) + 0.5(5)(5)^2 = 62.5 m

s_total = s1 + s2 + s3 = 187.5 + 4500 + 62.5 = 4750 m

So the distance between the speed limit sign and the checkpoint is 4750 meters.

iv. The average velocity for the whole journey is given by the total distance travelled divided by the total time taken:

s_total = 4750 m

t_total = 15 + 180 + 5 = 200 s

v_avg = s_total / t_total = 4750 / 200 = 23.75 m/s

So the average velocity for the whole journey is 23.75 m/s.

Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

\(k = \frac{1}{2} m {v}^{2} \\ \)

v is the velocity

m is the mass

From the question we have

\(k = \frac{1}{2} \times 1300 \times {20}^{2} \\ = 650 \times 400 \\ = 260000\)

We have the final answer as

Hope this helps you