-The reaction between H2SO4/HNO3 is exothermic, so splashing is less likely if the heat from disassociation is used to heat the ice-Using ice will prevent the temperature from getting too high

Answer:

\(\vec{A} + \vec{B} = \vec{A} - \vec{B}\) if and only if \(\vec{B}\) is a zero vector.

Explanation:

An equation is true if and only if adding the same value to both sides of the equation (the value needs to be compatible) gives an equation that is also true.

Start with the \(\vec{A} + \vec{B} = \vec{A} - \vec{B}\).

This equation is true if and only if \(\left(\vec{A} + \vec{B}\right) + \vec{B} = \left(\vec{A} - \vec{B}\right) + \vec{B}\) (\(\vec{B}\) is added to both sides of the original equation.)

Vector addition and subtraction are associative. Therefore, \(\left(\vec{A} + \vec{B}\right) + \vec{B} = \left(\vec{A} - \vec{B}\right) + \vec{B}\) if and only if \(\vec{A} + \left(\vec{B} + \vec{B}\right) = \vec{A} + \left(- \vec{B} + \vec{B}\right)\), which is equivalent to \(\vec{A} + 2\, \vec{B} = \vec{A}\).

\(\vec{A} + 2\, \vec{B} = \vec{A}\) if and only if \(\left(-\vec{A}\right) + \vec{A} + 2\, \vec{B} = \left(-\vec{A}\right) + \vec{A}\) (\(\left(-\vec{A}\right)\)is added to both sides of this equation,) which is equivalent to \(2\, \vec{B} = \vec{0}\).

\(2\, \vec{B} = \vec{0}\) if and only \(\displaystyle \frac{1}{2} \cdot \left(2\, \vec{B}\right) = \frac{1}{2} \cdot \vec{0}\), which is equivalent to \(\vec{B} = \vec{0}\). That is: \(\vec{B}\) is the zero vector.

In other words:

\(\begin{aligned}& \vec{A} + \vec{B} = \vec{A} - \vec{B}\\ &\iff \left( \vec{A} + \vec{B}\right) + \vec{B} = \left(\vec{A} - \vec{B}\right) + \vec{B} \\ &\iff \vec{A} + \left(\vec{B} + \vec{B}\right) = \vec{A} + \left(- \vec{B} + \vec{B}\right) \\ & \iff \vec{A} + 2\, \vec{B} = \vec{A} \\ & \iff \left(-\vec{A}\right) + \vec{A} + 2\, \vec{B} = \left(-\vec{A}\right) + \vec{A} \\ &\iff 2\, \vec{B} = \vec{0} \\ &\iff \frac{1}{2} \cdot 2\,\vec{B} = \frac{1}{2} \cdot \vec{0} \\ &\iff \vec{B} = \vec{0}\end{aligned}\).

Hence, \(\vec{A} + \vec{B} = \vec{A} - \vec{B}\) if and only if \(\vec{B}\) is the zero vector.

Answer:

The answer is C

Explanation:

unintentional injuries can happen anywhere so it's best to take precautions

Explanation:

Newton's second law, which states that the force F acting on a body is equal to the mass m of the body multiplied by the acceleration a of its centre of mass, F = ma, is the basic equation of motion in classical mechanics.

Answer:

F = ma (F = m × a)

Explanation:

Newton's second law of motion is F = ma, or force is equal to mass times acceleration.

Players can move more quickly and fall less frequently by minimising friction between the ice and their skates by smoothing the ice surface with an ice resurfacer.

A mechanised ice resurfacer is called a Zamboni. It operates by scraping the snow off of the ice surface. The ice is then "cleaned" by pouring water upon it, which flushes any dirt or debris out of the deep grooves in the ice.

An NHL hockey game typically lasts 60 minutes. Three 20-minute periods make up a game, with a rest period in between the first and second. While they could be shorter in other leagues, NHL intermissions last 18 minutes.

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2)

Explanation

Step 1

Ohm's law states that the strength of a direct current is directly proportional to the potential difference and inversely proportional to the resistance of the circuit.

so

a)

b)

Step 2

2

let

Power is equal to voltage multiplied by current.

so

also, replacing

also

I hope this helps you

Answer:

Charges B and C are negative

Explanation:

• We are certain of a law of magnetism that states "Field lines move from positive charge to negative charge"

\({}\)

Answer:

B and C are negative.

Explanation:

This is because according to the law of charges in electric field line it says that the lines forming the electric field move from the positive terminal to the negative terminal,hence making B and C be negative as the lines are moving into them.

The Kinetic energy of the rock is 196 J.

To calculate the Kinetic energy of the rock, we apply the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 2

Hence, The Kinetic energy of the rock is 196 J.

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The acceleration lasted for 0.007s.

To find the answer, we need to know about the Newton's equation of motion.

Newton's equations are

V= final velocity, U= initial velocity, a= acceleration, t= time and S = distance

60²-0= 2a×0.2= 0.4a

Thus, we can conclude that the acceleration of the fireshell lasted for 0.007s.

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Answer:  The reason why some objects feel warmer than others even if they are at the same temperature has to do with their thermal conductivity. Thermal conductivity is a measure of how well a material can transfer heat. Materials with high thermal conductivity transfer heat easily, while materials with low thermal conductivity do not transfer heat as easily.

When you touch an object, your skin can’t actually detect the temperature of the object itself. Instead, it senses its own temperature. If you touch an object that is a good thermal conductor, it will transfer heat to or from your skin quickly, making your skin feel warmer or colder. On the other hand, if you touch an object that is not a good thermal conductor, it will transfer heat to or from your skin more slowly, so your skin won’t feel as warm or cold.

So, even if two objects are at the same temperature, one may feel warmer than the other because it is transferring heat to your skin more quickly due to its higher thermal conductivity.

Answer:

is from 9 x 107 m/sec to 27 x 107 m/s

Answer:

(a) Most reactive \({}\)       Metal B

\({}\)                                    Metal D

\({}\)                                    Metal A

Least reactive \({}\)           Metal C

(b) (i) Bubbles should form very slowly

(ii) No reaction takes place

Explanation:

(a) The given metals arranged in their order of reactivity are;

Most reactive \({}\)       Metal B

\({}\)                               Metal D

\({}\)                               Metal A

Least reactive \({}\)      Metal C

The other of reactivity is based on the nature of their reactivity of the metals in air

(b) (i) Based on the reactivity of the metals in air, whereby metal A reacts very slowly and an oxide is formed, we have that, based on the reactivity of the metal A, when mixed with dilute hydrochloric acid, bubbles should form very slowly

(ii) Similarly, given that metal C is unreactive, we have that when small pieces of metal C are added to dilute hydrochloric acid, no reaction takes place.

If there are both electric and magnetic fields in the room and their effects on the charged particle cancel, and the electric field points upward, then the direction of the magnetic field is downwards.

The electric force on a charged particle is provided by an electric field, whereas the magnetic force is provided by a magnetic field. The effect of the electric and magnetic fields on the motion of the particle is a function of the relative directions and magnitudes of the two fields.

If the magnetic field is perpendicular to the electric field and the particle's velocity, the magnetic force is at right angles to both the electric force and the velocity, and it does not adjust the particle's speed. If the electric and magnetic forces on a charged particle are equal and opposite, they cancel each other out, resulting in no acceleration of the charged particle. Since the electric field is pointing upward, the magnetic field should be pointing downward.

In conclusion, the direction of the magnetic field is downward if the electric field is pointing upward, according to the given condition.

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The free body diagram allows to find the results for the forces applied on the refrigerator are;

       a) Free-body diagram with applied force.

       b) Free-body diagram without applied force.

A free-body diagram is a diagram of the forces without the details of the body, these diagrams are important to clearly visualize the forces and the coordinate systems against which to take measurements.

In the attached we have a free-body diagrams for a refirerator, represented by the box where the forces are appreciated:

Newton's second law states that the net force is proportional to the mass times the acceleration of the body.

             ∑ F = ma

where F is the force, m the mass and the acceleration

          ∑ F = F - fr = 100 N

          a = 100 / m

In conclusion with the free body diagram we can find the results for the forces applied on the refrigerator are;

a) Free-body diagram with applied force.

b) Free-body diagram without applied force.

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148.49 minutes

First find the cubic inch area of the pool.

33.8 x 40 x 11.1

You get 15007.2

Convert that to inches by multiplying it by 12.

You get 180086.4. Divide that by 231 since each 1 gallon is 231 cubic inches.

You get 779.594805

Now divde that by 5.25 (rate of flow)

You get 148.49 rouned to the nearest hundreth.

If you are able to do brainliest, I'll be happy. This took some big division...

Answer:

12 N

Explanation:

Use Newton's second law:

∑F = ma

F = (2.4 kg + 1.3 kg) (3.2 m/s²)

F = 11.84 N

Rounded to two significant figures, the force is 12 N.

If the isotope has a half-life of 1150 years, this means that every 1150 years the amount of the isotope is halved. After one half-life, the amount is reduced to 1/2, after two half-lives it is reduced to 1/4, after three half-lives it is reduced to 1/8, and so on.

To determine how many years are required for the isotope to decay to 25% of its original amount, we need to determine how many half-lives it takes to get from 100% to 25%.

25% is the same as 1/4, so we need to determine how many times we need to halve the original amount to get to 1/4.

1/4 = (1/2)^n, where n is the number of half-lives

Solving for n:

n = log(1/4) / log(1/2)

n = 2

This means that it takes two half-lives for the isotope to decay to 25% of its original amount.

Since the half-life is approximately 1150 years, the time required for two half-lives is approximately:

2 x 1150 years = 2300 years

Therefore, it would take approximately 2300 years for a given amount of this isotope to decay to 25% of that amount.

As per the details given, the force required to submerge the block of wood in oil is approximately 2.406 N. the force required to submerge the table-tennis ball in water is approximately 0.462 N.

To calculate the amount of the buoyant force on the ice cube, first establish its volume and then apply Archimedes' principle.

Volume of the ice cube = \(s^3\) = \((1.5 cm)^3\) = 3.375 \(cm^3\)

Buoyant force = Weight of the displaced water

Buoyant force = Density of water * Volume of the ice cube * Acceleration due to gravity

Density of water (ρ_water) = 1.000 \(g/cm^3\)

Acceleration due to gravity (g) = 9.8 \(m/s^2\)

So,

Buoyant force = (ρ_water * Volume of the ice cube * g) / 1000

Buoyant force = (1.000 * 3.375 * 9.8) / 1000

Buoyant force ≈ 0.033 N

The magnitude of the buoyant force on the ice cube is approximately 0.033 N.

To determine the power necessary to immerse the block of wood in oil, we must first calculate its volume and then apply Archimedes' principle.

Volume of the block = L * W * H = 13.0 cm * 7.0 cm * 2.0 cm

Force = Weight of the displaced oil

Force = Density of oil * Volume of the block * Acceleration due to gravity

Force = (ρ_oil * Volume of the block * g) / 1000

Force = (0.920 * Volume of the block * 9.8) / 1000

Force ≈ 2.406 N

The force required to submerge the block of wood in oil is approximately 2.406 N.

To determine the force necessary to sink the table tennis ball in water, first calculate the volume of the ball and then apply Archimedes' principle.

Volume of the ball = (4/3) * π * \((d/2)^3\)

Force = Weight of the displaced water

Force = Density of water * Volume of the ball * Acceleration due to gravity

Force = (ρ_water * Volume of the ball * g) / 1000

Force = (1.000 * Volume of the ball * ) / 1000

Force ≈ 0.462 N

Thus, the force required to submerge the table-tennis ball in water is 0.462 N.

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The normal stress on an inclined plane at 25 degrees can be calculated using σ = F / A * cos²θ, while the maximum normal stress is σ_max = F / A_max.

a. To calculate the normal stress developed on an inclined plane, we use the formula: σ = F / A * cos²θ. Given that the diameter of the rod is 12 inches, the radius (r) is half of the diameter, which is 6 inches or 0.5 feet. The cross-sectional area of the rod (A) can be calculated using the formula for the area of a circle: A = π * r². Substituting the values, we get A = π * (0.5)^2 = π * 0.25 = 0.7854 square feet.

Now, we can calculate the normal stress using the given axial tensile load (F) of 60 kips and the angle (θ) of 25 degrees. Since the load is given in kips (1 kip = 1000 pounds), we convert it to pounds by multiplying by 1000: F = 60 * 1000 = 60000 pounds.

Using the formula σ = F / A * cos²θ, we substitute the values and calculate the normal stress:

σ = 60000 / 0.7854 * cos²25 ≈ 95317.91 psi (pounds per square inch).

b. The maximum normal stress in the rod occurs when the inclined plane is aligned with the maximum cross-sectional area. In this case, the maximum cross-sectional area (A_max) is the same as the cross-sectional area of a circle, which is π * r². Substituting the radius value, we get A_max = π * (0.5)^2 = π * 0.25 = 0.7854 square feet.

To calculate the maximum normal stress (σ_max), we use the formula σ_max = F / A_max. Substituting the given axial tensile load (F) of 60 kips and the maximum cross-sectional area (A_max), we calculate the maximum normal stress:

σ_max = 60000 / 0.7854 ≈ 76448.44 psi (pounds per square inch).

Therefore, the normal stress developed on an inclined plane at an angle of 25 degrees with the cross section of the rod is approximately 95317.91 psi, and the maximum normal stress developed in the rod is approximately 76448.44 psi.

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The police car travels a distance of 300m is 7.41 meters per square second.

If we know that\($x_o=0 m, x_C=x_P=300\)m,  t=1s and vc=30\(\frac{\mathrm{m}}{\mathrm{s}}$,\) then we have the following system of equations:

300=30.t     (1)

300=

300= 1/2.ap.(t-1)²

By(1)

t=10

Then we find that acceleration of the police car must be:

300=1/2 .ap. (10-1)²

ap = 7.407m/s²

Therefore, the correct choice is C.

To the complete question is;

A speeding car is travelling at a constant 30.0 m/s when it passes a stationary police car. If the police car delays for 1.00 s before starting, what must be the magnitude of the constant acceleration of the police car to catch the speeding car after the police car travels a distance of 300 m?

(A) 6.00 m/s2

(B) 3.00 m/s2

(C) 7.41 m/s2

(D) 1.45 m/s2

(E) 3.70 m/s2

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Answer:

I tied searching for my lab answers but i dont know if this is newtons lab

Explanation:

Answer:

B

Explanation:

The angle of the plate will affect how much sunlight hits the plate. The amount of sunlight that hits a surface depends on the angle of incidence, which is the angle at which the sunlight hits the surface. When the angle of incidence is perpendicular to the surface (i.e., the sun is directly overhead), the maximum amount of sunlight is received by the surface.

However, as the angle of incidence increases, the amount of sunlight that hits the surface decreases because the same amount of sunlight is spread over a larger area. Therefore, if the plate is not angled properly to face the sun, it will receive less sunlight, which will affect its efficiency in converting sunlight into electricity.

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Following an inelastic collision, the kinetic energy can be converted into heat, potential energy and sound. Kinetic energy is motion energy.

Kinetic energy is motion energy, i.e., the energy contained by a particular object in movement.

This type of energy (kinetic energy) is produced by a given object during its acceleration.

Kinetic energy is transferred from a particular object to another during a collision (either an elastic collision or inelastic collision)

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Resulting force is the vector sum of all the forces acting on an object. The resulting net force of →10 N can be represented by ← 63 N and → 73 N

The net force on an object is the sum of all the forces acting on an object. Resolving the forces in vertical direction and horizontal direction separately gives the net force on the object.

∑Fx = ma

∑Fy = ma

The net force is pointing towards the right and the correct option must contain two horizontal forces whose resultant is towards the right.

Considering following horizontal forces,

Thus, the resulting net force of →10 N can be represented by ← 63 N and → 73 N

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Answer: C, 63N and 73 N

Explanation:

Answer :Gravity is the force that attracts two objects towards each other; when an object falls under the influence of gravity alone, it is said to be in free fall and will accelerate at a constant rate; as the velocity of a falling object increases, air resistance will begin to slow it down until it reaches terminal velocity; when an object is thrown or launched, it follows a curved path known as projectile motion which is influenced by both gravity and air resistance.

Answer:

Moon circles the earth

Explanation:

If you were at the sun and looking at the earth, from that point of view the moon appears to circle the earth.

Answer:

The Earth and the Moon both orbit around it together.

Explanation:

The Earth and the Moon both orbit around a common center of mass, called the barycenter, which is located within the Earth. From the point of view of the Sun, it appears that the Earth is orbiting around the barycenter, and the Moon is orbiting around the Earth. In other words, the Earth and the Moon are both in orbit around the Sun, but their paths around the Sun are perturbed by their mutual gravitational attraction. This means that, from the Sun's perspective, it looks like the Earth is orbiting around the Moon, even though the Earth and the Moon are actually both orbiting around the barycenter.

ALLEN

The magnitude of the resultant magnetic field inside the cylinder depends on the radius R and the angle φ. Without additional information about these parameters, we cannot determine the magnitude of the magnetic field.

The cylinder is subjected to a magnetic field with magnitude \(bâ 0 =\)\((0.260t)i^\)at temperatures near absolute zero. However, the direction of this magnetic field is not specified. Assuming that the magnetic field is directed along the axis of the cylinder, we can calculate the magnitude of the resultant magnetic field inside the cylinder using the Biot-Savart Law.

The Biot-Savart Law states that the magnetic field at a point due to a current-carrying conductor is directly proportional to the magnitude of the current and the length of the conductor, and inversely proportional to the distance from the conductor. Mathematically, the law can be expressed as:

B = (μ₀I)/(4πr),

where B is the magnitude of the magnetic field at a point, I is the current flowing through the conductor, r is the distance from the point to the conductor, and μ₀ is the magnetic constant.

Assuming that the cylinder is a long, straight conductor carrying a current I, the magnitude of the magnetic field inside the cylinder at a distance r from the axis of the cylinder is given by:

B = (μ₀I)/(2πr)

We can substitute the value of I from the given magnetic field expression and simplify:

\(B = (μ₀*0.260t)/(2πr) i^\)

At temperatures near absolute zero, the value of the magnetic constant μ₀ is approximately \(4π x 10^-7 T m/A\), and the radius of the cylinder is not specified.

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Answer:

Comencemos con la primera:

si tenemos algo como:

7.1*10^n

Simplemente lo que tenemos que hacer es:

si n es positivo, movemos n veces el punto para la derecha, si no tenemos dígitos, completamos con ceros.

si n es negativo, movemos n veces el punto a la izquierda.

a) 7.1*10

aca tenemos n = 1

entonces movemos una vez el punto a la derecha:

7.1*10 = 71. = 71

b) 2.3*10^3

aca n = 3, entonces movemos el punto 3 veces a la derecha:

2.3*10^3 = 23__.

Tenemos dos huecos ahí, los cuales serán completados con ceros, entonces:

2.3*10^3 = 2,300. = 2,300

c) 1.56*10

n = 1, entonces movemos el punto una vez a la derecha:

1.56*10 = 15.6

d) 4.10^4

acá tenemos n = 4

entonces movemos el punto 4 veces a la derecha, recordar que debemos completar con ceros:

4.10^4 = 40,000. = 40,000