A rubber block weighing 40.0 newtons is resting on a horizontal level surface of dry concrete. What is the magnitude of the minimum force needed to start the rubber block moving across the dry concrete?

Acceleration

Now

Apply Newtons second law

To find frictional force we need coefficient of friction which is not given .

generally for car case the value of coefficient is 0.6-0.8 .

Putting max 0.8

Note:

Last part is assumption not accurate

The force acting on the sports car is the product of its mass and acceleration. The force on the car is 3300 N.

Force is an external agent acting on a body to deform it or to change it from the state of rest or motion. There are different kinds of forces such as frictional force, gravitational force, nuclear force, magnetic force etc.

Frictional force is acting as a hindrance to the motion of an object. The frictional force is the product of normal force and coefficient of friction.

According to second law of motion, force is the product of mass and acceleration.

Given mass m = 1000 Kg

change in velocity = 20 - 0 m/s

Acceleration = 20 m/s / 6.6 s

= 3.3 m/s².

Force = m a

= 3.3 m/s² × 1000 Kg

= 3300 N.

Now, product of this normal force and coefficient of static friction.

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The desired level of motor unit recruitment and force of muscle contraction without causing harm to the muscle tissue.

The amplitude or voltage of an electrical signal used to stimulate a muscle is a critical factor in determining the level of motor unit recruitment and the force of muscle contraction.

Motor units are groups of muscle fibers innervated by a single motor neuron. The number of motor units that are recruited during a muscle contraction determines the force generated by the muscle. When a small number of motor units are recruited, the force generated is relatively small. However, as more motor units are recruited, the force generated increases. The recruitment of motor units follows the "size principle", which states that smaller motor units are recruited first, followed by larger motor units as the force required increases.

The amplitude or voltage of an electrical signal applied to a muscle determines the number of motor units that are recruited. A low amplitude or voltage signal will only recruit a small number of motor units, resulting in a weak muscle contraction. As the amplitude or voltage of the signal increases, more motor units are recruited, resulting in a stronger muscle contraction.

However, there is a limit to the number of motor units that can be recruited by an electrical signal. Once all available motor units are recruited, further increases in amplitude or voltage will not produce any additional force. Additionally, excessively high amplitude or voltage signals can cause muscle damage and discomfort.

Therefore, the amplitude or voltage of an electrical signal used to stimulate a muscle must be carefully controlled to achieve the desired level of motor unit recruitment and force of muscle contraction without causing harm to the muscle tissue.

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Answer:

Answer is neutrons.

Explanation:

The nucleus contains two types of subatomic particles, protons and neutrons.the protons have a positive electrical charge and the neutrons have no electrical charge.

I hope it's helpful!

Answer:

Explanation:1.6 N

Explanation:

Weight, W = mg where m = mass = 0.16 kg and g = 10 N/kg

W = mg = 0.16 kg × 10 N/kg = 1.6 N

The weight of the cricket ball is 0.588 N.

Given data:

The mass of cricket ball is, m = 0.06 kg.

The weight of any object can be expressed as the product of mass and gravitational acceleration. Then the weight of cricket is given as,

W = mg

Here, g is the gravitational acceleration.

Solving as,

\(W = 0.06 \times 9.8\\\\W =0.588 \;\rm N\)

Thus, we can conclude that the weight of the cricket ball is 0.588 N.

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Answer: 12

Explanation:

The resultant vector is  12 unit.

When two vectors point in the same direction, their sum is equal to the total of their respective magnitudes pointing in the same direction.

When two vectors are pointed in opposite directions, the resultant vector is pointed in the direction of the larger vector and is equal to the difference between their magnitudes.

Here, one vector of 15 unit is acting to the left and another vector of 3 unit acting rightwards. As they are acting in opposite direction, vector summation of two vector will be equal to the value of subs traction of their magnitude.

So, Resultant vector= 15 unit + (-3 unit)

= 15 unit - 3 unit

= 12 unit.

Hence, the resultant vector will be 12 unit.

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To calculate the activity coefficient and activity of components A and B in the given binary solution, we can use the relation:

PA = γA * xA * PA*

Where:

- PA is the partial pressure of component A,

- γA is the activity coefficient of component A,

- xA is the mole fraction of component A,

- PA* is the standard partial pressure of component A.

Similarly, for component B:

PB = γB * xB * PB*

Given information:

PA = 0.020 bar

PA* = 0.034 bar

PB = 0.050 bar

xB = 0.053

kH,B = 0.78 bar

(a) Calculation for component A:

From the given information, we can see that the activity coefficient (γA) is not provided. Therefore, we need additional information or an equation relating the activity coefficient to solve for it.

(b) Calculation for component B:

We have the necessary information to calculate the activity coefficient (γB) and activity of component B.

Using the relation for component B:

PB = γB * xB * PB*

Substituting the given values:

0.050 bar = γB * 0.053 * PB*

To solve for γB, we rearrange the equation:

γB = PB / (xB * PB*)

Substituting the given values:

γB = 0.050 bar / (0.053 * 0.050 bar)

γB ≈ 1.886

Now, to calculate the activity of component B, we can use the equation:

PB = γB * xB * PB*

Substituting the given values:

PB = 1.886 * 0.053 * 0.050 bar

PB ≈ 0.00502 bar

Therefore, the activity coefficient (γB) of component B is approximately 1.886, and the activity (PB) of component B is approximately 0.00502 bar.

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The product (2 amperes × 2 volts × 2 seconds) is equal to 8 joules.

The formula for electrical power is P = VI, where P is power in watts, V is voltage in volts, and I is current in amperes. The product of amperes, volts, and seconds can be rearranged as follows:

(2 amperes × 2 volts × 2 seconds) = (2 amperes) × (2 volts) × (2 seconds)

= (4 volts) × (2 seconds) × (2 amperes)

= (4 volts) × (4 coulombs/second)

= 16 joules

However, the question asks for the product in units of coulombs, newtons, joules, calories, or newton-amperes. Since the answer is in joules, the correct option is (C) 8 joules.

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Answer:

v_avg = 2.9 cm/s

Explanation:

The average velocity of the object is the sum of the distance of all its trajectories divided the time:

x_all is the total distance traveled by the object. In this case you have that the object traveled in the first trajectory 165cm-15cm = 150cm, and in the second one, 165cm - 25cm = 140cm

Then, x_all = 150cm + 140cm = 290cm

The average velocity is, for t = 100s

hence, the average velocity of the object in the total trajectory traveled is 2.9 cm/s

Answer:

There cannot be a force without motion and if there is no motion, then there is no force acting.

Explanation:

A force is a vector that causes an object with mass to accelerate.

Answer:

because force need motion

Explanation:

Dynamics is the study of bodies' masses and forces when they are speeding up or slowing down. It is a branch of physics that focuses on the analysis of motion and the effects of external factors, such as force and torque, on the movement of objects. Dynamics is divided into two main subfields: kinematics and kinetics.

Kinematics deals with the description of motion, such as displacement, velocity, and acceleration, without considering the causes of the motion. It helps us understand how an object moves, but it does not explain why the object is moving.

On the other hand, kinetics examines the relationship between the forces acting on an object and the resulting motion. It focuses on concepts like Newton's laws of motion, which are fundamental principles in understanding the behavior of moving objects. These laws explain how external forces affect an object's acceleration, based on its mass and the applied force.

Dynamics has various practical applications in everyday life and scientific research. For instance, it helps engineers design vehicles and machines by predicting their performance under different operating conditions. In sports, it assists in understanding how athletes can optimize their movements to achieve better results.

In summary, dynamics is the study of the motion of objects and the forces that cause them to speed up or slow down. It is essential for understanding the behavior of objects in motion and has significant applications in various fields, such as engineering, sports, and physics.

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The star is moving away from Earth at a velocity of 1.8 x 106 m/s.

The Doppler Effect describes the shift in wavelength of a wave when the source is moving in relation to the observer. The shift can be observed in sound waves, light waves, and other waves.

The Doppler Effect can be used to determine the velocity of objects moving away from an observer, as in the case of stars moving away from Earth.

The velocity of a star moving away from Earth can be determined using the equation:

v = Δλ/λ x c, Where v is the velocity of the star, Δλ is the shift in wavelength of the spectral line, λ is the wavelength of the spectral line measured in the lab on Earth, and c is the speed of light (3.00 x 108 m/s).

In this case, the shift in wavelength of the spectral line is Δλ = 500.3 nm - 500 nm = 0.3 nm.

The wavelength of the spectral line measured in the lab on Earth is λ = 500 nm.

Plugging in these values to the equation above: v = Δλ/λ x cv = (0.3 nm / 500 nm) x (3.00 x 108 m/s) = 1.8 x 106 m/s.

Therefore, velocity of star 1.8 x 106 m/s.

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The uncertainty in the volume of the block is determined by propagating the uncertainties in the measurements of sides a, b, and c.

The uncertainty in the best estimate for b is ±0.1 mm. When measuring the same side of a block multiple times, each measurement has an uncertainty of Δb = 0.1 mm.

The best estimate for b is obtained by averaging the measurements. Since the uncertainty in each measurement is the same, the uncertainty in the best estimate is also ±0.1 mm.

What is the uncertainty ΔV in the volume of the block? To calculate the uncertainty in the volume of the block, we need to consider the uncertainties in the measurements of sides a, b, and c. Each measurement has an error of ±0.03 mm.

By using the formula for the volume of a block, V = abc, we can apply the method of propagation of uncertainties. Using the formula ΔV/V = √((Δa/a)^2 + (Δb/b)^2 + (Δc/c)^2), we can plug in the values of a, b, c, Δa, Δb, and Δc to calculate the uncertainty ΔV.

The uncertainty in the density can be found by applying the propagation of uncertainties to the formula for density, which is defined as mass divided by volume.

Given the mass M = 25.3 g with an uncertainty ΔM = 0.05 g, and the volume V = 9.16 cm^3 with an uncertainty ΔV = 0.05 cm^3, we can use the formula Δdensity = √((ΔM/M)^2 + (ΔV/V)^2) to calculate the uncertainty in the density.

Find χ^2 when the measured density is compared to the accepted density of pure aluminum.

The χ^2 test is used to determine the goodness of fit between observed data and expected values. In this case, we are comparing the measured density, which is 2.76 g/cm^3 with an uncertainty of Δρ = 0.03 g/cm^3, to the accepted density of pure aluminum, which is 2.70 g/cm^3. T

he formula for χ^2 is calculated as the squared difference between the observed value and the expected value divided by the uncertainty squared. The χ^2 value can be calculated using the formula χ^2 = (ρ - ρ_expected)^2 / Δρ^2, where ρ is the measured density and ρ_expected is the accepted density of pure aluminum.

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The higher the energy, the faster the particles vibrate (which means a higher frequency).

option D

Waves like sound  wave is produced when an object vibrates, creating a pressure wave.

This pressure wave causes particles in the surrounding medium to have vibrational motion. As the particles vibrate, they move nearby particles, transferring energy between neighboring particles, creating a faster vibration as the energy transmitted increases.

Thus, we can conclude that, waves have energy that causes particles in matter to vibrate. So, it stands to reason that the higher the energy, the faster the particles vibrate (which means a higher frequency).

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Answer:

7 feet because 2 feet and 5 feet make seven.

The formula for determining the amount of heat energy needed to change the temperature of an object is given by the equation Q = mcΔT, where Q represents the heat energy, m is the mass of the object, c is the specific heat capacity of the material, and ΔT is the change in temperature.

The amount of heat energy needed to change the temperature of an object can be calculated using the formula Q = mcΔT. The variables in the equation have the following meanings: Q represents the heat energy, which is measured in joules (J); m is the mass of the object, typically measured in kilograms (kg); c is the specific heat capacity of the material, which is the amount of heat energy required to raise the temperature of one kilogram of the material by one degree Celsius (J/kg·°C); and ΔT is the change in temperature, measured in degrees Celsius (°C).

The formula states that the heat energy (Q) required is directly proportional to the mass of the object (m), the specific heat capacity (c) of the material, and the change in temperature (ΔT). By multiplying the mass, specific heat capacity, and temperature change, we can calculate the amount of heat energy needed to change the temperature of an object. This formula is applicable to various scenarios where heat transfer and temperature changes are involved, allowing for accurate calculations of heat energy requirements.

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The thermal energy needed to melt 1.25 kg of water at its melting point is 416.25 kJ.

The latent heat of fusion is the amount of thermal energy required to change the phase of a substance from a solid to a liquid state without a change in temperature.

When a substance is in a solid state, the molecules are packed closely together and are held in a rigid structure by intermolecular forces. As heat is added to the solid, the temperature of the substance increases until it reaches the melting point, which is the temperature at which the solid starts to change into a liquid.

At the melting point, the added thermal energy is used to break the intermolecular bonds that hold the molecules in the solid structure. The energy absorbed during this process causes the molecules to become less ordered and to move more freely, resulting in a liquid state. However, during the melting process, the temperature of the substance remains constant until all of the solid has melted.

The latent heat of fusion is a property of the substance and is defined as the amount of energy required per unit mass to change the phase from solid to liquid. It is usually measured in units of joules per kilogram (J/kg) or kilojoules per kilogram (kJ/kg).

The latent heat of fusion is an important concept in thermodynamics and is used in many applications, such as the melting of ice, the solidification of molten metals, and the formation of igneous rocks.

Here in the Question,

To calculate the thermal energy needed to melt 1.25 kg of water at its melting point, we can use the formula:

Q = mass x latent heat of fusion

where Q is the thermal energy required, and the latent heat of fusion is the amount of energy required to change the phase of a substance from solid to liquid without changing its temperature.

Substituting the given values, we get:

Q = 1.25 kg x 333 kJ/kg

Q = 416.25 kJ

Therefore, 1.25 kilogram of water requires 416.25 kJ of thermal energy to melt at its melting point.

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By multiplying mass and radius, the moment of inertia is computed.

The mass moment of inertia, also known as rotational inertia, of a body is a measure of its resistance to a change in the direction of its rotation or angular momentum. In essence, it describes the acceleration that an object or solid experiences when torque is applied.

The formula for the moment of inertia is "sum of the product of mass" of each particle with "square of its distance from the axis of rotation."inertia. I = miri2 is how the moment of inertia formula is written.

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A 0.105-m x 0.233-m x 0.329-m block suspended from a wire and completely submerged in water experiences a buoyant force of 3.32 N.

When an object is immersed in a fluid, it experiences a buoyant force, which is the upward force exerted by the fluid. According to Archimedes' principle, the buoyant force is equal to the weight of the fluid displaced by the object.

In this case, the block's volume is given as 0.105 m x 0.233 m x 0.329 m, which equals 0.00811 m³. Since the block is submerged in water, the fluid displaced is also water. The density of water is approximately 1000 kg/m³.

Multiplying the volume of the block by the density of water gives the mass of the water displaced, which is 8.11 kg.

To calculate the buoyant force, we use the formula: Buoyant force = density of fluid x volume of fluid displaced x gravitational acceleration. Substituting the values, we have: Buoyant force = 1000 kg/m³ x 0.00811 m³ x 9.8 m/s² ≈ 3.32 N.

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The correct answer is 12x+7 as when you multiply these two numbers they cancel each other out

It is necessary to collimate the light source before using the prisim to  disperse the light so that the light rays entering the prisim are parallel.

What is collimate?

Collimator is a tool for converting a point source's divergent radiation into a parallel beam. To perform specific measurements in spectroscopy, geometrical optics, and physical optics, the light must be collimated.

An optical collimator is made up of a tube with a convex lens at one end and a variable aperture at the other end that is located in the lens' focal plane. To examine the image without parallax, radiation entering the aperture exits the collimator as a parallel beam.

Therefore collimation is needed for the light rays entering the prism to be parallel.

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Answer:

distance between should be 1.25 × 10^6 m

Explanation:

Force is proportional to separation distance.

\(250 \: newtons = 2.5 \times {10}^{6} \: metres \\ ( \frac{1}{2} \times 250) \: newtons = d \\ \\ d = \frac{125 \times 2.5 \times {10}^{6} }{250} \\ d = 1.25 \times {10}^{6} \: metres\)

Answer:

distance between should be 1.25×10^6.

Explanation:

force Is proportional to separation .

mrk above answer branilest .

Answer:

7: C 8:All of These

Explanation:

Im almost 100% sure on both of these. Feedback is like critism and you'll get nowhere focusing on all good and no bad. You can't go to the doctor on your own if you're a child for technically it's both yours and your parents. Your teacher is responsible for notifying your parents and you are responsible for telling your teacher.

In conclusion, doubling the distance between two objects of the same mass would result in the gravitational force between them to decrease by a factor of four. This demonstrates the inverse square relationship between distance and gravitational force.

Doubling the distance between two objects of the same mass would result in the gravitational force between them decreasing by a factor of four.

This is because the force of gravity is inversely proportional to the square of the distance between the objects.

To understand this, let's consider Newton's Law of Universal Gravitation. According to this law, the gravitational force (F) between two objects is given by the equation:

F = G * (m1 * m2) / d²

Where G is the gravitational constant, m1 and m2 are the masses of the objects, and d is the distance between them.

Now, if we double the distance (d) between the objects, the equation becomes:

F' = G * (m1 * m2) / (2d)²

Simplifying this equation, we get:

F' = G * (m1 * m2) / 4d²

Comparing the two equations, we can see that the force (F') is one-fourth (1/4) of the original force (F). In other words, doubling the distance decreases the gravitational force between the objects by a factor of four.

In conclusion, doubling the distance between two objects of the same mass would result in the gravitational force between them to decrease by a factor of four. This demonstrates the inverse square relationship between distance and gravitational force.

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Answer:

Wavelength  = 0.48 m (Approx)

Explanation:

Given:

Speed of sound = 340 m/s

Frequency = 706 hz

Find:

Wavelength

Computation:

Wavelength  = Speed of sound / Frequency

Wavelength  = 340 / 706

Wavelength  = 0.48 m (Approx)

(a) The hot resistance of the headlight is 1.45 Ω.

(b) The current flowing through the headlight is 4.2 A.

(a) To find the hot resistance of the headlight, we can use the formula:

Power = Voltage² / Resistance, where Power = 27.5 W and Voltage = 6.15 V.

Rearrange the formula to solve for Resistance:

Resistance = Voltage² / Power = (6.15 V)² / 27.5 W = 37.8225 / 27.5 ≈ 1.45 Ω.

(b) To find the current flowing through the headlight, we can use Ohm's Law:

Voltage = Current × Resistance, where Voltage = 6.15 V and Resistance = 1.45 Ω.

Rearrange the formula to solve for Current:

Current = Voltage / Resistance = 6.15 V / 1.45 Ω ≈ 4.2 A.

The hot resistance of a 27.5 W headlight in a car with a 6.15 V electrical system is approximately 1.45 Ω, and the current flowing through it is approximately 4.2 A.

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Answer:

gravity

Explanation:

Answer:

answer is 2 ms-2

Explanation:

v= 10.0 m/s

u=4.0 m/s

t=3.0 seconds

a=?

from equation, v= u+at

10.0 m/s =4.0 m/s + a × 3s

6 m/s. = 3a

6/3 = a

2.0 m/s-2 = a

Using concepts of Force, we got Mg is the force exerted by person to lift the block

We know very well that gravitational force plays a vital role in holding the objects.

Actually, we need to work against the gravity as gravity tries to pull the block  again on the surface, means we need to do some work against the gravity so that we are able to lift the block.

We need that every object in this universe has some mass.

Therefore we are assuming mass of block is M

Now, due to gravity acceleration due to gravity (g) also applied on the block.

Therefore, Force exerted by man =Mass×Acceleration

                                               Force=M×g

Hence, Force exerted by man to lift the block is Mg

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I don't know sorry didn't make me want you say you didn't know how I feel about me being that way and that I didn't even want you say I was wrong and you didn't want me to be to have a good time