now click on the flip polarity and move the bar magnet to the right and observe the direction of the needle in the voltmeter. which direction the needle moves?

The density of this cement sample is equal to \(2727.27\;kg/m^3\)

Given the following data:

To calculate the density of this cement sample​:

First of all, we would determine the volume of the rectangular block.

\(Volume = length \times width \times height\\\\Volume = 1.1 \times 2 \times 2.5\\\\Volume = 5.5 \;m^3\)

Now, can calculate the density of this cement sample:

Mathematically, the density of a substance is given by the formula;

\(Desnity =\frac{Mass}{Volume}\)

Substituting the values into the formula, we have;

\(Density=\frac{15000}{5.5} \\\\Density =2727.27\;kg/m^3\)

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Note: 1.1 m, 2 m, 2.5 m are the figures provided from a rectangular block of cement.

Answer: The dissipative component of evolution is in a direction of steepest entropy ascent

Explanation:

According to our definition, every non-equilibrium state of a system or local subsystem for which entropy is well defined must be equipped with a metric in state space with respect to which the irreversible component of its time evolution is in the direction of the steepest entropy ascent permissible under the conservation constraints. We derive (nonlinear) expansions of Onsager reciprocity and fluctuation-dissipation relations to the far-non-equilibrium world inside the rate-controlled constrained-equilibrium approximation to demonstrate the force of the fourth law (also known as the quasi-equilibrium approximation).

Voltage drop across any components in series is proportional to its resistance. 60W bulb has higher resistance than 100W bulb if both the bulbs were rated for same voltage. So higher voltage drop will be across a 60W bulb.

In parallel voltage drops will be same across both the bulbs but current through it will be inversely proportional to the resistance. So 100W bulb draws more current than 60W bulbs.

60W dissipates more energy than 100W bulbs when in series and 100W bulbs dissipates more energy when in parallel.

Answer:

i think its  c

Explanation:

Answer:

The branch of physics that is most relevant to football is mechanics, the study of motion and its causes.

Explanation:

When the ball leaves the punter's foot, it is moving with a given velocity (speed plus angle of direction) depending upon the force with which he kicks the ball. The ball moves in two directions, horizontally and vertically. Because the ball was launched at an angle, the velocity is divided into two pieces: a horizontal component and a vertical component.

The total mass of the system after combustion is therefore 1Kg (ashes) + 9Kg (gases and water vapor) = 10Kg, which is the same as the total mass before combustion.

Therefore, if the mass of the logs before burning was 10Kg, the total mass of the system before combustion was 10Kg (logs) + 0Kg (oxygen) = 10Kg. After combustion, the mass of the ashes was 1Kg, so the mass of the remaining gases and water vapor released into the atmosphere was 10Kg - 1Kg = 9Kg.

There are three fundamental quantities in mechanics that are conserved. These are power, forward motion, and angular momentum.

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Question is incomplete.!

Answer: D

Explanation: i just took the test edge 2023

Answer:

Defined below

Explanation:

Climate change is simply the long term change in the average weather patterns that are associated with the local, regional and global climates of the earth. Climate change is usually driven by human activities like burning of fossils; natural processes like cyclic ocean patterns; external factors like volcanic eruptions.

Explanation:

a

2.

a

3.

a

4.

a

5.

d

6.

a

7.

a

8.

b

9.

b

10.

c

Approximately 124.9 gigajoules (GJ) of energy are required to move a 1,000-kg object from the Earth's surface to an altitude twice the Earth's radius.

To calculate the energy required to move a 1,000-kg object from the Earth's surface to an altitude twice the Earth's radius, we can use the formula for gravitational potential energy:
Potential energy (PE) = mass (m) * gravitational acceleration (g) * height (h)

Given:

Mass (m) = 1,000 kg

Gravitational acceleration (g) on Earth's surface = 9.8 m/s²

Height (h) = 2 * Earth's radius (r)

The Earth's radius (r) is approximately 6,371 km or 6,371,000 meters.

Substituting the values into the formula:

PE = 1,000 kg * 9.8 m/s² * 2 * 6,371,000 m ≈ 124,897,200,000 J

Therefore, approximately 124,897,200,000 joules (or 124.9 GJ) of energy are required to move a 1,000-kg object from the Earth's surface to an altitude twice the Earth's radius.

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Answer:

The main difference between the two is - nuclear fusion results in fusing many smaller atoms into one, while in nuclear fission, the atom splits into two or more smaller ones.

Explanation:

Firstly, "fusion" generally means combining many things to one, while "fission" refers to breaking down one thing into different components. Also, nuclear fission is not common in nature, while nuclear fusion does (like in stars, for example).

answer:

change in momentum = 37,500kg.m/s in the opposite direction

time it takes = 12.5s

working:

u=25m/s

v=0m/s

F=ma

-3000=(1500)(a)

-3000÷1500=a

a= -2m/s^2

Change in momentum=mv-mu

(1500)(0)-(1500)(25)

= -37,500kg.m/s

relax the( - ) represents direction

v=u-at

0=25-2t

2t=25

t= 12.5s

These grasshopper-related insects generate massive swarms that travel across areas. Since the Pharaohs ruled ancient Egypt, plagues of locusts have destroyed societies and continue to cause devastation now.

Invertebrates (animals without a backbone) have a hard exterior covering called an exoskeleton. The head, thorax, and abdomen make up an insect's three-part body. The majority of mature insects also have wings, and they all have six legs. Insects come in more than a million different varieties.

Ants are the most common bug in the world, which should not be surprising. There are around 10,000 species of these colonial hymenopterans, with an estimated population size of 10–100 trillion individuals worldwide.

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The magnitude of the charge on each sphere can be calculated using Coulomb's Law, which states that the force between two charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

In this case, we can rearrange the equation to solve for the charge, Q:

Q = √(Fd2/k),

where F is the force (22 mN), d is the distance (16 mm), and k is Coulomb's constant (8.99 x 109 Nm2/C2). Plugging in the values, we get:

Q = √(22 x 10-3 N x 16 x 10-3 m2/8.99 x 109 Nm2/C2)

Q = 0.087 C.

Therefore, the magnitude of the charge on each sphere is 0.087 C.

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It should be noted that Rust and sodium nitrite were been produced during the reaction between the iron pipes and the fertilizer.

Chemical reaction can be regarded as a process involving conversation of one or more substances, known as reactants, are converted to different substances known as products.

When iron pipes and the fertilizer which are reactants react together, then products of Rust and sodium nitrite is formed.

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Answer:

Moved away from the nucleus

Answer:

Some examples of external stressors include:

Major life changes. These changes can be positive, such as a new marriage, a planned pregnancy, a promotion or a new house. ...

Environment. The input from the world around us can be a source of stress. ...

Unpredictable events.

Workplace.

Social.

Explanation:

To react completely with 0.500 L of volume of 0.500 M Na2CO3, you would need 0.250 L of 2.00 M HCl.

Write down the balanced chemical equation for the reaction between HCl and Na2CO3:

2 HCl + Na2CO3 → 2 NaCl + H2O + CO2

Determine the stoichiometry of the reaction:

From the balanced equation, we can see that 2 moles of HCl react with 1 mole of Na2CO3.

Calculate the number of moles of Na2CO3:

Given that the volume of Na2CO3 solution is 0.500 L and the concentration is 0.500 M, we can use the formula:

Moles = Concentration × Volume

Moles of Na2CO3 = 0.500 M × 0.500 L = 0.250 moles

Use the stoichiometry to determine the number of moles of HCl needed:

According to the stoichiometry of the balanced equation, 1 mole of Na2CO3 reacts with 2 moles of HCl.

Therefore, to react with 0.250 moles of Na2CO3, we would need 2 × 0.250 = 0.500 moles of HCl.

Convert moles of HCl to volume:

Given that the concentration of HCl is 2.00 M, we can use the formula:

Volume = Moles / Concentration

Volume of HCl = 0.500 moles / 2.00 M = 0.250 L

Convert the volume to liters:

The final answer is 0.250 liters of 2.00 M HCl are needed to react completely with 0.500 L of 0.500 M Na2CO3.

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The can be obtained by using the balanced chemical equation: Na2CO3 + 2 HCl → 2 NaCl + H2O + CO2  Write the balanced chemical equation for the reaction.

Na2CO3 + 2 HCl → 2 NaCl + H2O + CO2

Calculate the number of moles of Na2CO3. Using the formula n = c × V, where n is the number of moles, c is the concentration, and V is the volume, we get:

n = c × V

= 0.500 M × 0.500 L

= 0.250 mol

Calculate the number of moles of HCl required.The balanced chemical equation shows that 2 moles of HCl react with 1 mole of Na2CO3. Hence, the number of moles of HCl required can be calculated as follows

:n(HCl) = 2 × n(Na2CO3)

= 2 × 0.250 mol

= 0.500 mol

Calculate the volume of 2.00 M HCl required.The number of moles of HCl required is 0.500 mol. Using the formula V = n/c, where V is the volume, n is the number of moles, and c is the concentration, we get:

V = n/c

= 0.500 mol ÷ 2.00 M

= 0.250 L

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Answer:

A: 2.8 * 10^(-14) J

Explanation:

Formula to find the energy is;

E = hc/λ

Where;

E is energy of a photon (E)

λ is wavelength of the light

c is speed of light

Thus;

E = (1.99 *10^(-25))/(7 * 10^(-12))

E = 2.8 * 10^(-14) J

Answer:it's a chemical change.physical changes occur without 2 or more reactants,a reaction,and a product

Explanation:

Answer:

the image is behind the mirror

virtual

erect(not inverted)

larger than the object

Answer:

c

Explanation:

Matter or mass cannot be created nor be destroyed in a chemical reaction ..according to law of conservation

The distance δz between two surfaces separated by a potential difference δv is given by the equation δz = εAδv/Q, where A of plates, the charge stored Q, and permittivity ε of material between the plates.

The distance δz between two surfaces separated by a potential difference δv can be determined using the equation for capacitance. Capacitance is a property of a system that relates the potential difference across it to the amount of charge it can store. The formula for capacitance is given by C = Q/δv, where C represents the capacitance, Q is the charge stored, and δv is the potential difference.

If the surfaces are plates of a parallel plate capacitor, the capacitance can be expressed as C = εA/δz, where ε is the permittivity of the material between the plates, A is the area of the plates, and δz is the distance between them. By equating the two equations for capacitance, we can solve for δz:

εA/δz = Q/δv

Rearranging the equation, we find δz = εAδv/Q. This equation relates the distance δz between the surfaces to the potential difference δv, the area A of the plates, the charge stored Q, and the permittivity ε of the material between the plates.

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The correct answer is: (a) An object gives another object an opposite charge without losing any of its own charge.

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The third statement (Magnetic forces can raise the trains off the track, reducing frictional forces acting against the train. Less work is needed to propel the train) describes how magnetic forces can be harnessed to increase the speeds at which trains travel.

The scientifically-recognized concept dubbed "magnetic force" dictates that there either exists attractive or repulsive forces created between opposing magnet poles and electrically-charged moving particles--thanks to electromagnetic activity taking place behind-the-scenes. Most notably, all magnets produce an invisible magnetic field with intensified strength around their polar regions.

If two standalone magnets confront one another with opposing polarities visible on either end, then an intrinsic attraction manifests itself due to their respective concentrated fields at those points; though if you flip both magnets around so that their identical polarity ends face each other instead, then repulsion happens thanks to stronger opposing fields.

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Answer:

friction

air drag

every thing that opposes the motion affects kinetic energy

Explanation:

kinetic energy is a energy which is increase with increase in motion and potential energy is energy stored while the object is at rest

potential energy ∝ 1/(kinetic energy)

as kinetic energy increases potential energy decreases

Answer:

126 V

Explanation:

The computation of the rms voltage is shown below:

=  I × R

=(.2) × (10)

= 2 V voltage drop across capacitor

= I × 1 ÷ (?C)

= I ÷ (2 × pi × f × C)

= (.2) ÷ (2 × pi × 10,000 × 10 × 10^-6)

= .318 V voltage drop across inductor

= I × ?L

= I × 2 × pi × f × L

= .2 × 2 × pi × 10,000 × .010

= 126 V

Answer: B

Explanation: The wavelength determines color. The wavelength is measured from crest to crest.