How long would it take to swim across a lake that is 350 meters, if you swam at 9 m/sec

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Answer:

The answer is A

Explanation:

Answer:

A. How fast something works.

Explanation:

Power in physics is the rate at which work is done.

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(A) The direction of electric field in given region is to the left.

(B) The potential difference is -0.46×\(10^{3}\).

(A) When charge is present in any form, a point in space has an electric field that is connected to it. The value of E, often known as the electric field strength, electric field intensity, expresses the strength and direction of the electric field.

Therefore, the direction of electric field in given region is to the left.

(B) The amount of work required to move a unit charge from one point to another point is equal to the potential difference between two points in an electric circuit.

\(V_{B} -V_{A}\) = W / Q

\(V_{B} -V_{A}\) = 2.30×\(10^{-3}\) / -4.9×\(10^{-6}\)

\(V_{B} -V_{A}\) = -0.46×\(10^{3}\)

Therefore,  the potential difference is -0.46×\(10^{3}\).

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Hi!Schrodinger equation is written as HΨ = EΨ, where h is said to be a Hamiltonian operator.

Explanation:

The relationship between harmonics and resonance frequency in a piano is that the harmonics of the vibrating strings align with the resonance frequencies of the piano's soundboard and other components. This alignment allows the harmonics to be amplified and sustained, resulting in the characteristic and rich sound produced by the instrument.

Answer:

Why ?? What happened ??

Answer:

node jaer  le cotenidonv

Explanation:

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The earth absorbs 240 W/m² of energy from the sun and radiates it back to space when measured at the earth's surface.

When measured at the Earth's surface, the amount of energy that the Earth absorbs from the sun and radiates back into space is approximately 240 W/m². This value represents the net energy balance at the Earth's surface, taking into account both incoming solar radiation and outgoing thermal radiation. The Earth's surface absorbs sunlight, which provides energy for various processes such as heating the atmosphere, evaporating water, and supporting biological activity. At the same time, the Earth's surface also emits thermal radiation, primarily in the form of infrared radiation, to maintain a thermal equilibrium. The balance between incoming solar radiation and outgoing thermal radiation is essential for maintaining the Earth's climate and temperature.

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Answer:

Explanation:

Answer:

There was no anwser

Explanation:

because dylan did not anwser

If the distance between two point charges is tripled, the mutual force attraction between them will be reduced by a factor of 1 by 9th.

The square of the separation distance is inversely correlated with the electrostatic force which is the mutual force of attraction. F is therefore nine times smaller, or one-ninth the original value if the distance between the charges is made three times larger.

A point charge is defined as a charge which doesn't have any area or volume and hence it appears as a point.

The mutual force of attraction which is also referred to as the electrostatic force of attraction is defined as the force that exists between two charged particles in a 3D space.

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What is Electric Field?

-- Electric field, an electric property associated with each point in space when charge is present in any form.

--The magnitude and direction of the electric field are expressed by the value of E, called electric field strength or electric field intensity or simply the electric field..

What is electric force ?

-- The repulsive or attractive interaction between any two charged bodies is called as electric force.

--  Similar to any force, its impact and effects on the given body are described by Newton's laws of motion.

-- The electric force is one of the various forces that act on objects.

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Answer:

Gravitational force between masses there is Gravitational force .

The center of a mass, also known as the center of gravity, is a point at which the total weight of an object can be considered to be concentrated.

Centre of a mass is the point at which the object is in balance, and any external force applied to it will cause it to rotate around this point. The center of mass is calculated by considering the mass distribution of an object and determining the point at which the object is in balance.

The center of mass of a symmetrical object, such as a sphere, is located at its geometric center. For an asymmetrical object, such as a flat plate or a human body, the center of mass is located at a different point from its geometric center. The location of the center of mass is determined by the distribution of mass in the object, with heavier parts of the object having more influence on the position of the center of mass.

The concept of center of mass is important in many fields, including physics, engineering, and mechanics. It is used to determine the stability of objects, to calculate the forces and torques that act on objects, and to understand the motion of objects in the presence of external forces. Understanding the center of mass is also essential in fields such as robotics, biomechanics, and sports science, where the motion of objects and the forces that act on them are critical.

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The density of a substance can the found when you divide mass by the volume.

i.e Density = mass / volume.

Density can simply be defined as the ratio of mass per unit volume of a substance. Density is messed in kilograms per meters cubed ( kg/m3 )

Density is a derived physical quantity. This implies that it is derived from the combination of fundamental quantities

Derived quantities are those physical quantities which are derived from the combination of one or more fundamental quantities by addition or multiplication or division.

So therefore, the density of a substance can the found when you divide mass by the volume.

i.e Density = mass/volume.

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Answer

A) Time to reach zenith

t

=

2.2

2

=

1.1

s

v

=

u

+

a

t

∴

0

=

u

−

9.8

×

1.1

u

=

10.78

m/s

Explanation:

Answer:

The dimension of thermal conductivity is M1L1T−3Θ−1, expressed in terms of the dimensions mass (M), length (L), time (T), and temperature (Θ). Other units which are closely related to the thermal conductivity are in common use in the construction and textile industries.

Explanation:looked it up for ya

The entropy change for the surroundings when 1.57 moles of react at standard conditions is  62.436 kJ.

The value for standard molar entropy of formation for the reactants and products are :

ΔHf° (H2,g) = 0 kJ/mol

ΔHf° (Br2, l) = 0 kJ/mol

ΔHf° (HBr, g) = -36.3 kJ/mol

ΔH° (reaction) = sum  of molar enthalpy of products-sum of molar enthalpy of reactants.

For the given reaction,

ΔH° (reaction) = [(ΔHf° (H2,g) + ΔHf° (Br2, l)]-[2ΔHf° (HBr, g)] = [0 + 0- (2*(-36.3))] = 72.6 kJ/mol

This means when 2 moles of HBr (g) reacts the enthalpy change for reaction is 72.6 kJ/mol, so when 1.72 moles of HBr (g) reacts the enthalpy change is [(72.6/2)*1.72] i.e 62.436 kJ.

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Answer:

In general, a scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of a phenomenon is called a scientific theory. It is a misconception that theories turn into laws with enough research.

Explanation:

hope you get it right

  :)

Answer: Found this in google. Statement based on repeated experiments or observations, that describe or predict a range of natural phenomena. Hope this helps!

Explanation:

Unit vectors in three-dimensional space have certain properties that are useful in many applications, such as physics, engineering, and computer graphics. These properties include linear independence, orthogonality, and relationships between dot and cross products.

In three-dimensional space, unit vectors are vectors with a magnitude of 1. Therefore, the following statements are true:

1. Any two distinct unit vectors are linearly independent.

2. The cross product of any two distinct unit vectors is also a unit vector that is orthogonal to both.

3. The sum of any two unit vectors may or may not be a unit vector, depending on the angle between them.

4. The dot product of any two unit vectors is equal to the cosine of the angle between them.

In summary, unit vectors in three-dimensional space have certain properties that are useful in many applications, such as physics, engineering, and computer graphics. These properties include linear independence, orthogonality, and relationships between dot and cross products. Understanding these properties can help in solving problems involving vectors and three-dimensional geometry.

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"The percentage of the population living in extreme poverty goes down." Therefore, option (D) is correct.

Migration from rural areas to cities can have a positive impact on poverty reduction. Urban areas often offer better access to job opportunities, education, healthcare, and social services, which can help individuals and families improve their living conditions.

As people migrate to cities and gain access to these resources, the percentage of the population living in extreme poverty tends to decrease.

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The radiation pressure exerted by the electromagnetic wave with a peak electric field of 2.00 mV/m on a perfectly reflecting surface at normal incidence is approximately 7.08 x 10⁻¹⁸ N/m².

To calculate the radiation pressure exerted by an electromagnetic wave on a perfectly reflecting surface, we can use the formula:

P = (2 * ε₀ * c * E₀²) / c

Where P is the radiation pressure, ε₀ is the vacuum permittivity (8.85 x 10⁻¹² F/m), c is the speed of light in vacuum (3 x 10⁸ m/s), and E₀ is the peak value of the electric field.

In this case, the peak value of the electric field is given as 2.00 mV/m. However, it's important to convert this value to volts per meter (V/m) for consistent units. Since 1 mV = 10⁻³ V, we have:

E₀ = 2.00 mV/m = 2.00 x 10⁻³ V/m

Now, substitute the given values into the formula:

P = (2 * ε₀ * c * E₀²) / c

P = (2 * 8.85 x 10⁻¹² F/m * 3 x 10⁸ m/s * (2.00 x 10⁻³ V/m)²) / (3 x 10⁸ m/s)

Simplifying the expression:

P = (2 * 8.85 x 10⁻¹² F/m * 3 x 10⁸ m/s * 4.00 x 10⁻⁶ V²/m²) / (3 x 10⁸ m/s)

P = (2 * 8.85 x 10⁻¹² F/m * 4.00 x 10⁻⁶ V²/m²)

P ≈ 7.08 x 10⁻¹⁸ N/m²

Therefore, the radiation pressure exerted by the wave on a perfectly reflecting surface at normal incidence is approximately 7.08 x 10⁻¹⁸ N/m².

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Answer:

Assuming that the first person pulls with 0° direction, the second person pulls with 90° direction and the third person pulls with 180° direction, the net force would be

\(F=(60-75)i+70j\\F=-15i+70j\)

It's module is

\(|F|=\sqrt{(-15)^{2} +(70)^{2} } =\sqrt{225+4900} \approx 71.6 \ KgF\)

Therefore, the net force is 71.6 Kgf

Now, in the second problem, if the forces are parallel and have the same direction and sense, that means those forces complement each other, that means if the major one is 250 Newtons, then the second one is 200 Newtons, because the net force is 250 N.

Therefore, the missing force is 200 N.

The combination of a particle's mass and velocity produces momentum. Momentum is a vector quantity that has both magnitude and direction. The force exerted on a particle is equated to the time rate of change of momentum by Isaac Newton's second equation of motion.

First law of Newton : According to Newton's first law of motion, if a body is at rest or moving in a straight path at a constant speed, it will stay in that state or continue to move in that direction unless it is acted upon by an outside force.

Second law of Newton : According to Newton's second rule of motion, a body's rate of momentum change is inversely proportional to the force acting on it, and momentum changes occur in the direction of the net applied force.

Third law of Newton : Newton's third law of motion states that there is always an equal and opposite reaction to every action.

In order to accomplish work and to produce heat and light, energy must be transferred to a body or to a physical system. Energy is the quantitative attribute that does this.

A push or pull that an object experiences as a result of its interactions with its environment is known as a force.

Dust and smoke rising in the atmosphere as a result of an asteroid impact hinder sunlight from reaching our planet, resulting in a decrease in global temperature. Many living beings could die as a result of this incident. A small city might be destroyed if an asteroid the size of an apartment strikes Earth. A 20-story building-sized asteroid might wipe out a small nation if it were to strike Earth.

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Explanation:

A. Friction force is a force that opposes motion between two surfaces that are in contact

Answer:

The answer is D

Explanation:

It reduces the amount of thermal energy that is transferred from outside to inside the container.

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The foam reduces the amount of thermal energy that is transferred from outside to inside of the container, which prevents frozen food from melting. Thus, option D is correct.

Thermal energy is the energy present in the system that mainly depends on its temperature. Heat is the flow of thermal energy. When temperature increases in the system, the vibration of molecules increases more heat energy is released.

It is also defined as the transfer of heat energy between the systems and also the work done in the transfer of heat. When a substance is changed from one state to another state of matter, heat energy is released.

The material that prevents the heat (thermal energy) passes through them is called a thermal insulator. A foam is considered a good insulator and it is used to prevent frozen food from melting.

Foam is a thermal insulator that prevents heat flow and reduces the amount of thermal energy that is transferred from outside to inside the container.

Hence, the ideal solution is option D.

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Answer: <3

Explanation: ):

R(F) = 4F - 160

a. R¹(P) represents the temperature at which a cricket chirps at a rate of P chirps per minute.

b. R(60) refers to the chirping rate of the cricket when the temperature is 60 degrees Fahrenheit, while R¹(60) represents the temperature at which the cricket chirps at a rate of 60 chirps per minute.

The equation R(F) = 4F - 160 represents the relationship between the temperature of the cricket's environment (F) and its chirping rate (R). By plugging in different temperature values, we can determine the corresponding chirping rate.

For example, when we calculate R(60), we find the chirping rate at 60 degrees Fahrenheit.

In this case, R(60) = 4(60) - 160 = 240 - 160 = 80 chirps per minute.

On the other hand, when we calculate R¹(60), we are looking for the temperature at which the cricket chirps at a rate of 60 chirps per minute. Solving the equation 60 = 4F - 160, we find F = 70 degrees Fahrenheit. Therefore, R¹(60) = 70.

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The acceleration of the car down the 36° slope will be 5.76 m/s²

Recall :

The force which tends to roll the car down the hill :

Mass of the car :

12000 = m × 9.8

m = 12000 / 9.8

m = 1224.49 kg

The acceleration of the car down slope :

a = (7053.42) ÷ 1224.49

a = 5.76 m/s²

Therefore, the acceleration of the car is 5.76 m/s²

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To find a coterminal angle, we need to add or subtract multiples of 360° from the given angle, Measures of angles can be given by 95° – (1,450n)°, for any integer n, 95° – (1,080n)°, for any integer n, 95° – (780n)°, for any integer n, 95° – (340n)°, for any integer n

The question asks about an angle that is coterminal with a 95° angle. Coterminal angles are angles that have the same initial and terminal sides but differ by a multiple of 360°.

In this case, 95°, we can use any of the options to find coterminal angles.For example, if we choose the option 95° – (1,080n)°, the resulting angles will be coterminal with 95°. By substituting different values of n, we can obtain different coterminal angles such as 985°, -95°, -1,175°, etc

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