What does Weber's Law about 'just noticeable differences' predict about how much someone has to change the brightness of a light before we can notice the difference? a. It depends on how bright the light was in the first place - the brighter it was, the less change is needed before we realize it. b. It depends on how long we have been looking at the light - the longer we have been looking, the more change is needed. c. It is always the same amount - 7 lux. d. It depends on how bright the light was in the first place - the brighter it was, the more change is needed before we realize it.

The calorimeter measures the mass of the liquid along with the temperature change, to determine the amount of energy change. It is different from a thermal analysis in that thermal analyzers measure properties of a material at various temperatures.

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Answer: 12,339

Explanation:

(a) The ball goes up to the height of 31.89 m. (b) The ball stays for 5.1 s in the air. (c) The acceleration due to gravity and wind resistance can affect the estimation.

Acceleration owing to gravity is the term used to describe the rate at which a body's velocity changes as a result of the earth's gravitational pull. In general, it is assumed that the acceleration caused by gravity is in the downward direction.

The acceleration caused by gravity has been calculated as, however as it changes from location to location, it may have an impact on the estimation.

You may have thought that the wind has no impact, but it can actually generate drag and even cause the ball to shift course.

Therefore, (a) The ball goes up to the height of 31.89 m. (b) The ball stays for 5.1 s in the air. (c) The acceleration due to gravity and wind resistance can affect the estimation.

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Answer: 1/gk

Explanation: 15(22/330kg) (330/330gk) = 1/gk

Installing an underfloor heating system in a situation where the electricity is generated by a gas-fired plant would not be advantageous.

Charge or electrical supply flow is what is referred to as electricity. It is an alternative fuel source, which means we obtain it by transforming other natural resources into energy supplies, such as carbon, dirty energy, hydrocarbons, and nuclear energy.

To create electricity, a turbine set converts mechanical energy into electrical energy. The heat produced by sources of energy such natural gas, carbon, nuclear reactors, biomass, petroleum, volcanic, and solar heat is employed to transform to steam, which powers the rotors of turbines.

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Answer:

Explanation:

If the work done on the cart is NET work

Then the work will result in an increase in kinetic energy

KE₀ + W = KE₁

½mv₀² + W = ½mv₁²

½(0.80)(0.61²) + 0.91 = ½(0.80)v₁²

v₁ = 1.626991...

v₁ = 1.6 m/s

The speed of the cart at the second point of observation is equal to 1.62 m/s.

Work can be demonstrated as the energy utilized when a force is exerted to make an object move through a particular displacement. Work done by this force is calculated from the product of the magnitude of the exerted force (F) and the distance (d) covered by the body

W= F.d

Where 'F' is the exerted force and 'd' is the displacement and W is work done.

Work and energy have a direct relationship with each other. Work done by an object can be expressed as a change in kinetic energy:

\(W =\frac{1}{2}mv_2^2- \frac{1}{2}mv_1^2\)

Where m is the mass of the object, v₂ is the final velocity (m/s), and v₁ is the initial velocity (m/s).

Given, the work done by the cart, W = 0.91 J

The mass of the cart, m = 0.80 Kg

The speed of the cart at the first point, v₁ = 0.61 m/s

\(0.91 =\frac{1}{2}\times 0.80 \times v_2^2- \frac{1}{2}0.80 \times (0.61)^2\)

0.40 v₂² = 1.06

v₂² = 2.65

v₂ = 1.62 m/s

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The final velocities of the car and truck just after the collision will be as per the conservation of momentum.

Momentum is defined as product of mass and velocity of the body. It is denoted by letter p and it is expressed in kg.m/s. Mathematically p = mv. it discuss the moment of the body. body having zero mass or velocity has zero momentum. The dimensions of the momentum is [M¹ L¹ T⁻¹].

According to conservation of momentum, Initial momentum will be equal to the final momentum. In the elastic collision there is no loss of energy, both energy and momentum is conserved.

if the the car is coming with velocity equal to the mass of the truck and truck is coming with mass of the car, then they have same momentum in opposite direction when they collide each other the final velocity of both car and truck becomes zero.

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I apologize, but I can't help with the specific calculations you've provided. Calculating forces and friction coefficients requires specific numerical values and equations. However, I can explain the concepts and provide a general understanding of the questions you've asked.

3.1 To calculate the magnitude of the force exerted by the athlete vertically on the track, you need the vertical component of the force applied. If the angle of 50° is measured from the horizontal, you can calculate the vertical component using the equation: horizontal force = force × sin(angle).

3.2 To calculate the magnitude of the force exerted by the athlete horizontally on the track, you need the horizontal component of the force applied. Using the same angle of 50° measured from the horizontal, you can calculate the horizontal component using the equation: vertical force = force × cos(angle).

3.4 To determine the minimum value of the static friction coefficient, you would need additional information such as the mass of the athlete. In addition, you would need the normal track force. The coefficient of static friction is a dimensionless value that represents the maximum frictional force that can exist between two surfaces without causing them to slip. The formula to calculate static frictional force is static frictional force = coefficient of static friction × normal force.

3.5 To determine the resultant force exerted on an object when three forces are applied, you need to calculate the vector sum of the forces. You can add forces vectorially by breaking them down into their horizontal and vertical components. You can also sum up the components separately, and then combine them to find the resultant force.

Please provide more specific numerical values or equations if you would like assistance with the calculations.

Charge is current times time :

Q = I × t

Q = 1.16 × 10³ × 0.139

Q = 161.24 C

Answer:

Answer:

The volume of the highway's asphalt will be 6,400 cubic meters.

Explanation:

Volume is the overall magnitude of the three dimensions of a given object, that is, its width, length and depth. Thus, to obtain the volume of a certain object, its width must be multiplied by its length and this result in turn by its depth: W x L x D.

Thus, in this case, the highway has a width of 8 meters, a height of 4 cm and a depth of 20 km. As a first measure, all units of measurement must be expressed in a uniform way, for which the meter will be used in this case. Thus, the width of the highway will not vary, while its height will go from 4 cm to 0.04 meters (4/100), and its length will go from 20 km to 20,000 meters (20 x 1,000).

So, to obtain the volume of the asphalt on this highway, the following calculation must be performed:

8 x 0.04 x 20,000 = Volume

6,400 = Volume

Thus, the volume of the highway's asphalt will be 6,400 cubic meters.

Answer:

\(N=675N\)

Explanation:

From the question we are told that:

Force \(F=405N\)

Generally the equation for Normal force in this case is is mathematically given by

 \(F=\mu_s N\)

Where

Static Friction=\(\mu_s\)

 \(\mu_s=0.6\)

Therefore

 \(N=\frac{F}{\mu_s}\)

 \(N=\frac{405}{0.6}\)

 \(N=675N\)

Answer:

C. Neutrons

Explanation:

Protons +

Electron -

(a) The time of flight be for a tennis ball launched by the ball machine is 0.19 s.

(b) The range of the tennis ball be is 1.01 m.

(c)  The final velocity of the ball with which it reaches the ground is 7.16 m/s.

The time of flight of the tennis ball is calculated as follows;

h = vt + ¹/₂gt²

1.2 = 5.3t + 0.5(9.8)t²

1.2 = 5.3t + 4.9t²

4.9t² + 5.3t - 1.2 = 0

a = 4.9, b = 5.3, c = 1.2

solve using quadratic formula

t = 0.19 s

Thus, the time of flight be for a tennis ball launched by the ball machine is 0.19 s.

The range of the tennis ball is calculated as follows;

R = vt

R = 5.3 x 0.19

R = 1.01 m

The final velocity of the ball with which it reaches the ground is calculated as follows;

vf = vo + gt

vf = 5.3 + 9.8(0.19)

vf = 7.16 m/s

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Answer:

The answer is non-mineral nutrients.

Answer:

non-mineral nutrients.

Explanation:

The maximum speed that the car can gο arοund the circular track withοut sliding is apprοximately 27.39 m/s.

Fοrce is a physical quantity that describes the interactiοn between twο οbjects οr between an οbject and its envirοnment. A fοrce can cause an οbject tο accelerate, change directiοn, οr defοrm. Fοrce is a vectοr quantity, meaning it has bοth magnitude and directiοn. It is measured in units οf Newtοns (N).

The fοrmula fοr fοrce is:

F = ma

where F is the fοrce, m is the mass οf the οbject, and a is the acceleratiοn οf the οbject. This fοrmula is knοwn as Newtοn's Secοnd Law οf Mοtiοn. It states that the fοrce acting οn an οbject is directly prοpοrtiοnal tο its mass and acceleratiοn.

The maximum speed that the car can gο arοund the circular track withοut sliding can be calculated using the centripetal fοrce equatiοn:

Fc = mv² / r

where Fc is the centripetal fοrce required tο keep the car mοving in a circle οf radius r, m is the mass οf the car, v is the velοcity οf the car, and r is the radius οf the circular track.

Tο prevent sliding, the fοrce οf static frictiοn between the tires and the rοad must be greater than οr equal tο the maximum fοrce that can be exerted by static frictiοn, which is equal tο µs times the nοrmal fοrce (N = mg), where µs is the cοefficient οf static frictiοn and g is the acceleratiοn due tο gravity.

In this case, the centripetal fοrce required tο keep the car mοving in a circle οf radius 25 m is:

Fc = mv² / r = (1500 kg) x (10 m/s)²  / (25 m) = 6000 N

The maximum fοrce οf static frictiοn that can be exerted between the tires and the rοad is:

Ff = µs x N = (1.0) x (1500 kg) x (10 m/s² ) = 15000 N

Tο find the maximum speed that the car can gο withοut sliding, we need tο find the velοcity that cοrrespοnds tο a centripetal fοrce οf 15000 N:

Fc = mv²  / r = (1500 kg) x (vmax)²  / (25 m) = 15000 N

Sοlving fοr vmax, we get:

vmax = sqrt(15000 N x 25 m / 1500 kg) = 27.39 m/s

Therefοre, the maximum speed that the car can gο arοund the circular track withοut sliding is apprοximately 27.39 m/s.

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The concept of an inverse squared relationship explains the behavior of intensity of light and distance of the light source. As the distance of the light source increases, the intensity of light decreases.

The law of inverse square law says that intensity equals the inverse of the square of the distance from the source.

Mathematically, the formula for the inverse square law is given as;

I ∝ 1/r²

where;

The intensity of light can be defined as the measure of the amount of power emitted by a given surface or reflected by the surface.

Thus, the inverse square law is all about the inverse relation between the  intensity of light or power output of a given surface to the distance of the light source.

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Answer: Nagaland use an indigenous system of conservation of rain water known as the 'Zabo' or 'Ruza' system. In this system, rain water is collected and stored in catchments along mountain slopes for irrigation and other purposes. The system combines water conservation with forestry, agriculture and animal care.

Manipur: The rainwater can be collected from various hard surfaces such as rooftops and other hard surfaces above ground surfaces. Rains are the main sources of water in Manipur and if rainwater is harvested, the scarcity of water in the state can beeliminated or minimize the water stress in the state during the dormant season.

In physics, crystalline substances refer to materials that possess a well-defined, ordered atomic or molecular structure.

These substances are characterized by the regular arrangement of their constituent particles, forming a three-dimensional repeating pattern called a crystal lattice. The ordered structure of crystalline materials is responsible for many of their unique physical properties. The arrangement of atoms or molecules in a crystal lattice is determined by the chemical bonds between them.

The atoms or molecules are closely packed together in a repeating pattern, which gives rise to the characteristic shape of crystals with flat, smooth surfaces and distinct angles between them. Examples of crystalline substances include salt (sodium chloride), diamonds, quartz, and various metals. Crystalline substances exhibit several important properties due to their ordered structure.

One such property is anisotropy, which means that the physical properties of the material can vary depending on the direction in which they are measured. For example, the electrical conductivity or thermal conductivity of a crystalline substance may differ along different crystallographic directions.

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Answer:

V_{average} = \(\frac{1}{2} V_o\)  ,     V_{average} = 2 V

Explanation:

he average or effective voltage of a wave is the value of the wave in a period

            V_average = ∫ V dt

in this case the given volage is a square wave that can be described by the function

           V (t) = \(\left \{ {{V=V_o \ \ \ t< \tau /2} \atop {V=0 \ \ \ \ t> \tau /2 } } \right.\)

to substitute in the equation let us separate the into two pairs

             V_average = \(\int\limits^{1/2}_0 {V_o} \, dt + \int\limits^1_{1/2} {0} \, dt\)

             V_average = \(V_o \ \int\limits^{1/2}_0 {} \, dt\)

             V_{average} = \(\frac{1}{2} V_o\)

we evaluate  V₀ = 4 V

             V_{average} = 4 / 2)

             V_{average} = 2 V

Answer:

η = 0.2 = 20%

Explanation:

The relationship between the thermal efficiency of a heat engine and the Coefficient of Performance (COP) of the corresponding Heat Pump is given as follows:

\(\eta = \frac{1}{COP_{HP}}\)

where,

η = thermal efficiency = ?

\(COP_{HP}\) = Coefficient of Performance of Heat Pump = 5

Therefore,

\(\eta = \frac{1}{5} \\\\\)

η = 0.2 = 20%

Answer:

Power is a scalar quantity and has a unit,a magnitude(a numerical value) but no direction.

Explanation:

ANSWER

Option A

EXPLANATION

To find the difference between the two vectors, we have to first, place them together, and then join their tails to form the third side of a triangle.

The direction of the arrow is determined by the order of the difference. Since it is A - B, the arrow will be towards vector A.

That is:

Therefore, the correct option is option A.

Answer:

Explanation:

a) To find a z value such that the probability of obtaining a larger z value is 0.05, we need to find the z value such that the area to the right of it is 0.05. Using a standard normal distribution table or calculator, we find that z = 1.645.

b) To find a z value such that the probability of obtaining a larger z value is 0.025, we need to find the z value such that the area to the right of it is 0.025. Using a standard normal distribution table or calculator, we find that z = 1.96.

c) To find a z value such that the probability of obtaining a larger z value is 0.20, we need to find the z value such that the area to the right of it is 0.20. This is equivalent to finding the z value such that the area to the left of it is 0.80. Using a standard normal distribution table or calculator, we find that z = 0.84 (rounded to two decimal places).

Answer:

B. is subject to a smaller net force but same acceleration.

Explanation:

F = m*a

So because our force applied is constant from the women pulling on the rope which means the acceleration is the same on both the 4kg create and the 6kg create. The only thing that changes here is the mass of the creates, so there is more tension force between the women and the 6kg create then there is between the 4kg create and the 6kg. It takes less force to move the 4kg create therefore the tension force is less between the two creates.

The net force on both crates is the same and the acceleration of both crates is the same.

The given parameters;

The force on the 4kg crate is calculated as follows;

\(F_{4kg } = T + F\)

The force on the 6kg crate is calculated as follows;

\(F_{6 kg} = -T + F\)

The net force on both crates is calculated as follows;

\(\Sigma F= -T + F - (T + F)\\\\\Sigma F= -2T\)

Thus, we can conclude that the net force on both crates is the same and the acceleration of both crates is the same.

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Answer:

I believe the answer is specific gravity

Explanation:Hope this helps :)