The speed of a sound wave in air is 340 metres per second. The speed of a sound wave in solid concrete is 2950 metres per second
Use ideas about particles to suggest reasons for the difference in speed?

pls help​

Answer: Hand tools are necessary for daily activities.

Explanation:

The hand tools are useful for day to day activities they aid in pouring substances, holding things, mixing substances, cleaning and for other purposes. In a chemical laboratory the hand tools like test tube holders can help in holding the chemicals. In a medical laboratory the forceps can be useful in holding and cutting the sections without causing any harm to the hands. Hand tools avoid the direct contact with the microorganisms in medical laboratory thus protect against infections. Hand tools aid in surgical operations and they help in avoiding direct contact with the blood vessels and organs preventing contamination and infections.

The best explanation for why the results are the same for a positively charged rod and a negatively charged rod is that the charge on the spheres is redistributed to create opposite charges on the spheres.

The charge on the spheres is redistributed to create opposite charges on the spheres, which is why the results are the same for a positively charged rod and a negatively charged rod. This redistribution happens as a result of induction. As a result of the charge redistribution, the spheres develop an attraction to the rod. When a negatively charged rod is brought close to the spheres, the charge on the spheres is redistributed, causing one of the spheres to have a net positive charge and the other to have a net negative charge.

The sphere with the opposite charge (in this case, the one with a net positive charge) is attracted to the negatively charged rod, while the sphere with the same charge (in this case, the one with a net negative charge) is repelled. This redistribution results in the spheres separating from one other.When a positively charged rod is brought near the spheres, the same charge redistribution occurs, resulting in the same attraction between the oppositely charged sphere and the rod. Sphere B is far away, hence it does not undergo any charge redistribution as a result of the presence of the charged rod.

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The process of heating a cooled cup of coffee from 55°F to 130°F is an example of endothermic reaction. Endothermic reactions absorb energy in the form of heat and result in an increase in temperature. The coffee absorbs the energy from the microwave, causing its temperature to rise.

Heat reactions, also known as thermochemical reactions, are chemical reactions that involve a change in temperature. These reactions can either be endothermic or exothermic. Endothermic reactions absorb heat and result in a decrease in temperature, while exothermic reactions release heat and result in an increase in temperature. Heat reactions play an important role in many industrial processes such as chemical synthesis, power generation, and food preparation. They can also occur in biological systems, where heat energy is used to drive metabolic processes. Understanding heat reactions is essential for developing sustainable energy technologies, controlling environmental pollution, and improving human health.

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Answer:

Explanation:

The time taken by the motorcycle to reach the city can be found by using the formula

\(t = \frac{d}{s} \\ \)

d is the distance

s is the speed

From the question

d = 200 miles

s = 70 miles / hour

We have

\(t = \frac{200}{7} \\ = 28.571428 \\ \)

We have the final answer as

Hope this helps you

Explanation:

The only force acting on a projectile after it is launched is...

gravity force

Answer:

fats / liquids or proteins one of them

Explanation:

..........

Answer:

D) All of the above

Explanation:

I googled it :)

Answer: A.9.2m/s

Explanation:

Magnetic field strength of wire at 1.0 cm = 1.09 x 10^-4 T

To determine the magnetic field strength 1.0 cm away from the wire, we first need to calculate the current flowing through the wire using Ohm's law.

1. Find the resistance (R) of the wire using its length (L), diameter (d), and resistivity (ρ) of nichrome (1.10 x 10^-6 Ωm).
Area (A) = π(d/2)^2 = π(0.001/2)^2 = 7.85 x 10^-7 m^2
R = ρ(L/A) = (1.10 x 10^-6 Ωm)(1.0 m / 7.85 x 10^-7 m^2) = 1.40 Ω

2. Calculate the current (I) using Ohm's law: V = IR
I = V/R = 12V / 1.40 Ω = 8.57 A

3. Determine the magnetic field strength (B) at a distance (r) of 1.0 cm using Ampere's Law (B = μ₀I / 2πr), where μ₀ is the permeability of free space (4π x 10^-7 Tm/A).
B = (4π x 10^-7 Tm/A)(8.57 A) / (2π(0.01 m)) = 1.09 x 10^-4 T

The magnetic field strength 1.0 cm away from the wire is 1.09 x 10^-4 T.

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The answer is 553.76m.

\(\begin{aligned}a &=g \sin 5^{\circ}=0.87 \mathrm{~m} / \mathrm{s}^{2} \\s &=u t+\frac{1}{2} a t^{2} \\&=0+\frac{1}{2} \times 0.87 \times(0.6 \times 60)^{2}\end{aligned}\\=553.76m\)

What is acceleration?

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Answer:

\(a=0.1\ m/s^2\)

Explanation:

Given that,

Initial velocity, u = 0

Final velocity, v = 2 m/s

Time, t = 20 s

We need to find the acceleration of the swimmer. The acceleration of an object is equal to the change in velocity per unit time. It can be given by :

\(a=\dfrac{v-u}{t}\\\\a=\dfrac{2\ m/s}{20\ s}\\\\a=0.1\ m/s^2\)

So, her average acceleration of the swimmer is \(0.1\ m/s^2\).

Most large telescopes are reflectors, not refractors, due to advantages in cost-effectiveness, optical quality, support and stability, and versatility.

Reflectors are more cost-effective to construct than large refractors because mirrors are easier and less expensive to manufacture compared to large lenses. Reflectors also offer better optical quality by minimizing chromatic aberration, which can impact image quality in refractors. Additionally, reflectors provide better support and stability due to the even distribution of weight, making them easier to build and maintain structurally. Lastly, reflectors offer versatility through the ability to incorporate additional mirrors for various configurations and adaptability for different observations or instrumentation changes. These advantages make reflector telescopes the preferred choice for most large telescopes in astronomy.

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Answer:

B. a friction force

Explanation:

(i think)

Answer:

C. an electric force

the sweater and Explanation:

Electrons are rubbing against it and are atrractted

The technology that is involved with an ultrasound technologist include a diagnostic medical somographer and medical imaging technology.

It should be noted that an ultrasound technologist means an individual who uses specialized equipment to examine the human body.

The technology involves electromagnetic or sound waves as it used high. frequency sound waves to create images of the tissues in the body.

The basic properties of wave are wavelength, time period, frequency, speed and amplitude. The fundamental properties are reflection, refraction, diffraction, and interference.

The things needed for a ultrasound technologist include a degree in diagnostic medical sonography and a medical training in a hospital.

The advantages of this career include the fact that it offers job variety, there's job growth potential, and they earn a decent salary.

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The static friction force on the box is 25 N.

Static friction is a type of friction force that acts on the body when there is no relative motion between the object and the surface. As a result, even when the body is moving, it can still act. However, there shouldn't be any relative motion.

Weight of box W = mg = 100 N

Static friction coefficient = 0.25

Forces acting on box are I) Weight of box mg downwards, 2) Normal force on box N upwards 3)Friction force fs to the left and 4) Applied force P to the right.

N-mg=0⇒ N = mg

Net force acting on box in the vertical direction is zero,

\(f_{s}\) ≤ \(\mu_{s}\) N⇒\(f_{s}\) ≤ \(\mu_{s}\)mg⇒\(f_{s,max}\) = \(\mu_{s}\)mg

Net force acting on box in the horizontal direction is P - \(f_{s}\) = 0⇒P= \(f_{s}\) (until the box starts moving)

For the the box to move P = \(f_{s,max}\)

P= \(\mu_{s}\)mg = 0.25 × 100 = 25 N.

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To find the average velocity during each time period, we need to calculate the displacement and divide it by the time interval.

(a) Average velocity from t = 1 to t = 2:

Average velocity = Displacement / Time interval

(b) Average velocity from t = 1 to t = 1.1:

Average velocity = Displacement / Time interval

(c) Average velocity from t = 1 to t = 1.01:

Average velocity = Displacement / Time interval

(d) Average velocity from t = 1 to t = 1.001:

Average velocity = Displacement / Time interval

To estimate the instantaneous velocity at t = 1, we can take the derivative of the displacement function with respect to time and evaluate it at t = 1:

Instantaneous velocity at t = 1:

v(1) = d/dt [4 sin(st) + 2 cos(at)] evaluated at t = 1

Velocity is a vector quantity that indicates how fast an object is moving. The magnitude of this vector is called speed and is expressed in meters per second.

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Answer:

The acceleration due to gravity of the planet is approximately 15.083 m/s²

Explanation:

The given information are;

The mass of the golf ball = 45.93 gram

The time it takes the golf ball to hit the ground 0.44 seconds

The height, s, from which the golf ball is dropped = 146 cm = 1.46 m  

The equation of motion for the golf ball can be expressed as follows;

s = u·t + 1/2·a·t²

Where;

s = 1.46 m

u = The initial velocity of the golf ball = 0 m/s

a = The acceleration due to gravity of the planet

t = The time it takes the golf ball to hit the ground = 0.44 seconds

By substituting, we have;

1.46 = 0 × 0.44 + 1/2 × a × 0.44²

a = 1.46/(1/2 × 0.44²) ≈ 15.083 m/s²

The acceleration due to gravity of the planet = a ≈ 15.083 m/s².

A girl rides her cycle round a circular track of diameter 60 m. The track is banked at 15° to the horizontal. The coefficient of friction between the track and the tyres of the cycle is 0.25. Modelling the girl and her cycle as a particle of mass 60 kg moving in a horizontal circle, the minimum speed at which she can travel without slipping is 13.64 m/s.

To find the minimum speed at which the girl can travel without slipping, we need to consider the forces acting on her and her cycle as they move in a circular track.

The forces acting on the girl and her cycle are the gravitational force (mg), the normal force (N), and the frictional force (f). The frictional force provides the centripetal force necessary to keep the girl moving in a circular path.

The normal force can be resolved into two components: the vertical component (N⊥) and the horizontal component (N∥). The vertical component balances the gravitational force, while the horizontal component provides the centripetal force.

Mass of the girl and cycle (m) = 60 kg

Diameter of the circular track (d) = 60 m

Bank angle (θ) = 15 degrees

Coefficient of friction (μ) = 0.25

Find the normal force components:

N⊥ = mg cos(θ)

N∥ = mg sin(θ)

The frictional force:

f = μN⊥

The frictional force (f) provides the centripetal force required for circular motion:

f = m(v² / r)

Here, v is the velocity and r is the radius of the circular track. The radius is:

r = d / 2

Combining the equations, we have:

μN⊥ = m(v² / r)

Substituting the values we have:

μmg cos(θ) = m(v² / (d / 2))

v² = (μmg cos(θ) / m) * (d / 2)

v² = (μg cos(θ)) * (d / 2)

v = √((μg cos(θ)) * (d / 2))

v = √((0.25 * 9.8 * cos(15)) * (60 / 2))

v ≈ 13.64 m/s

Therefore, the minimum speed at which the girl can travel without slipping is approximately 13.64 m/s.

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Answer:

5

Explanation:

When society gets the most it can from its scarce resources, the outcome is called is efficiency option - b is correct answer.

We live in a world where human needs are limitless, but there is a finite amount of land, labor, and capital available to meet those needs. When deciding how to distribute scarce resources, choices must be made due to the conflict between society's limitless wants and our finite resources.

Efficiency means that society makes the most of its limited resources. Equity refers to the equitable distribution of the advantages of those resources among all of society's participants.

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The properties of the electric fields and particle acceleration are as follows;

1. 3.75 × 10¹² electrons

2. Attracted

3. -1348.5 N

4. 1348.5 N

5. 8890 N

6. 1.044 × 10⁻⁴ C

7. The direction is downwards

8. Please find attached the required drawing created with MS Word

9. 2.87 × 10⁸ m/s²

10. Please find attached the drawing of the path of the proton created with MS Word.

An electric field is a vector that describes the electric force experienced by a charged particle at any point in space.

1. The charge of an electron is approximately -1.6 × 10^(-19) C. If the glass rod has a charge of -0.6 μC, which is equivalent to -0.6 × 10^(-6) C, then the number of electrons added to the rod is (-0.6 × 10^(-6))/(-1.6 × 10^(-19) C/electron) = 3.75 × 10^12 electrons.

2. The charges of the pith ball and the metal plate are opposite, therefore, the pith ball and metal plate are attracted to each other.

3. To calculate the force on the negatively charged object from problem 2, Coulomb's law can be used as follows;

F = k·q₁·q₂/r²

Where;

k = Coulomb's constant  (8.99 × 10⁹ N·m²/C²)

q₁ and q₂ = The charges of the two objects

r = The distance between them

Therefore;

F = (8.99×10⁹ N·m²/C²) × (10 × 10⁻⁶ C) × (-6 × 10⁻⁶ C)/(0.02 m)² = -1348.5 N

4. The force on the positively charged object from problem 2 is equal in magnitude but opposite in direction to the force on the negatively charged object, so it is 1348.5 N

5. To calculate the electric field a distance of 4.0 mm away from a -2.0 μC charge, we can use the formula; E = k × q/r², where k is Coulomb's constant, and we get;

E = (8.99 × 10⁹ N·m²/C²)×(-2×10⁻⁶ C)/(4 × 10⁻³ m)² = -1123750000 N/C

The force on a -8.0 μC charge placed at this point can be calculated using the formula; F = q·E, where q is the charge and E is the electric field.

Plugging in the values, we get; F = (-8 × 10^(-6) C) × (-1123750000 N/C) = 8990 N

6. To float your sister in the air using opposing electric charges, you need to create an electrostatic force that is equal and opposite to her weight. Her weight is; m × g = 40 kg × 9.8 m/s² = 392 N

To calculate how much charge you need to deposit both on her and on a metal plate directly below her to create this force, we can use Coulomb's Law: F = k·q₁·q₂/r², where

k = Coulomb's constant

r = The distance between her and the plate = 0.5 m

The charge on the plate = The charge on her

Therefore;

q₁ = q₂ = q
Therefore;

q = √(F × r²/k) = √(392 × (0.5)²/(8.99 × 10⁹) ≈ 1.044 × 10⁻⁴

The charge required, q ≈ 1.044 × 10⁻⁴ C

7. The direction of the force on a proton when between two plates with a vertical electric field pointing downwards would be downwards as well since protons are positively charged particles.

8. Please find attached the drawing of the electric field lines

9. The electric force on the proton can be obtained from the formula;

F = q·E

Where;

q = The charge of the proton

E = The electric field

Therefore;

The electric force on the proton is (1.6 × 10⁻¹⁹) × (3.0 N/C) = 4.8 × 10⁻¹⁹ N

The formula for the acceleration of the proton is; a = F/m

Where;

a = The acceleration of the proton

m = The mass of the proton ≈ 1.67 × 10⁻²⁷ kg

Therefore;

a = (4.8 × 10⁻¹⁹ N)/(1.67 × 10⁻²⁷ kg) ≈ 2.87 × 10⁸ m/s²

The direction of the acceleration of the proton would be, downward, which is in the same direction as the electric field

10. Please find attached drawing of the path of the proton as it travels through the plate

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The salt concentration in the intravenous saline drip is 8.0 kg/m³.

The salt concentration in the intravenous saline drip is 8.0 kg/m³. To convert the salt concentration from g/L to kg/m³, we need to consider the units and make the appropriate conversions. Given that 1 mL (or 1 cm³) of water has the same volume as 1 cm³, we can use this equivalence to establish a relationship between mL and L:
1 L = 1000 mL
Now, let's convert the given concentration of 8.0 g of sodium chloride per liter to kg/m³:
First, we convert grams (g) to kilograms (kg): 8.0 g = 8.0 x 10^(-3) kg

Next, we convert liters (L) to cubic meters (m³):

1 L = 1 x 10^(-3) m³

Now, we can calculate the salt concentration in kg/m³:

Salt Concentration = (8.0 x 10^(-3) kg) / (1 x 10^(-3) m³) = 8.0 kg/m³

Therefore, the salt concentration in the intravenous saline drip is 8.0 kg/m³.

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According the moment of inertia, The solid sphere will have greater speed.

The moment of inertia is the tendency of an object to maintain its shape when it is rotating or is called inertia. This moment can also be interpreted as a measure of an object's ability to maintain its angular speed

There are several factors that affect the moment of inertia, namely the mass, shape of the object, the location of the turning point, and the distance from the turning point. Therefore, the greater the inertia, the more difficult it is for objects to move. Vice versa.

Note that this moment of inertia is the same explanation of Newton's first law. The sound of Newton's first law, namely "Objects in motion will tend to move, while objects that are still will tend to be still". This tendency to survive is called inertia.

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Two wires are made of the same material and have the same length but different radii. They are joined end-to-end and a potential difference is maintained across the combination, and the following quantity that is the same for both wires is the electric current.

Electric current refers to the movement of electric charge that is carried by moving electrons in a wire or an electric circuit. It is measured in amperes (A) and is a basic component of the study of electricity.

The current density is the current per unit of cross-sectional area of the material through which the current flows. It is represented by the symbol J and is given in amperes per meter squared (A/m²).

The electric field is the force per unit charge that a charged particle would experience when placed in the field. It is represented by the symbol E and is given in volts per meter (V/m).

Finally, the potential difference is defined as the difference in electric potential energy per unit of charge between two points in a circuit. It is also called voltage and is represented by the symbol V. It is measured in volts (V).

Based on the information given, both wires are of the same material and length, but their radii are different. This indicates that the wires' cross-sectional areas are not the same, which implies that their current densities would differ. Because the potential difference is the same across the wires, it must be the electric current that is identical in both wires. Thus, the right option is B, electric current.

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the first thing i can compare of sodium potassium and francium is that they all have one valence electron putting them all in group 1a therefore the reactivity decreases down the periodic tables periods so this would make the reactivity different which makes the order from least to greatest in reactivity is sodium, potassium and lastly francium.

Valence means space that can be filled. With the help of valence electrons, reactivity order, presence of elements in the group these all elements can be distinguished and compared.

A valence electron is an electron in the outermost shell associated with an atom that can experience the innovation of a chemical bond if the outer shell is not closed. Both atoms contribute one valence electron to create a shared pair.

Following are the ways by which the given element can be compared.

1. They have one valence electron in their outer shell.

2. They all are present in group 1 A.

3. The order from least to highest in reactivity is sodium, potassium, and finally francium.

Hence with the help of valence electrons, reactivity order, presence of elements in the group these all elements can be distinguished and compared.

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The magnitude of the frictional force on the skier is 20 N.

The magnitude of the vertical force  of skier is 666.14 N.

The value of the frictional force on the skier is determined by applying Newton's second law of motion as follows;

F - Ff = ma

where;

At a constant speed, the acceleration, a = 0

F - Ff = 0

F = Ff

20 N =  Ff

The vertical force due to weight of the skier is calculated as follows;

Fₙ = mg cosθ

where;

Fₙ = (75 x 9.8) cos(25)

Fₙ = 666.14 N

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A balloon is filled with pure carbon dioxide. gaseous terms could be used to describe the contents of this balloon

At ambient temperature, carbon dioxide, which has the chemical formula CO2, is a chemical compound that consists of molecules with one carbon atom covalently doubly linked to each of two oxygen atoms. the carbon dioxide. Names. various names. Gaseous carbonic acid

Carbon dioxide (CO2) is produced by both natural (such as volcanoes, animal breath, and plant degradation) and anthropogenic sources (primarily the burning of fossils fuels like coal, oil and natural gas to generate energy).

Too much carbon dioxide in the body can result in general symptoms including headache, exhaustion, and twitching muscles. Frequently, it goes away fast on its own. But in cases of severe hypercapnia, the body is unable to return to a stable CO2 level, and the symptoms are more severe.

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The cylindrical pressure vessel is constructed from steel plates that are welded along the 45° seam. The vessel has an inner radius of 1.25 mm and a wall thickness of 18 mm.

The inner radius of 1.25 mm specifies the distance from the center of the cylinder to its inner surface. The wall thickness of 18 mm refers to the distance between the inner and outer surfaces of the cylinder.

The welding along the 45° seam suggests that the steel plates are joined at an angle of 45 degrees. This seam is crucial for maintaining the structural integrity and pressure resistance of the cylindrical vessel.

Overall, the cylindrical pressure vessel is designed to withstand internal pressure while maintaining a specific inner radius, wall thickness, and welding configuration along the 45° seam.

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