does the pivot point (i.e., the triangle in the diagram upon which the ruler balances) exert a force on the ruler? does it exert a nonzero torque about the pivot?

A transmission Grid is called a network of transformers and transmission cables that transfer electrical power from power stations to consumers

Electrical transmission is the process of providing highly efficiently generated electricity to a district or over larger and longer distances. The main point of the grid is to give people access to electricity 24 hours without interruption and without any trouble in populated areas. Transformers play a crucial role in this. Transformer help in increasing the voltage of the grid to make it more powerful and effective. It helps in the feasible transmission of the grid.

The electrical transmission system is combined with power plants in cities, distribution systems for easier access to electricity, and sub-stations for backup and other purposes which is to form what is known as the electrical grid. The grid meets people's electricity requirements and is what gets the electrical power from its generation to its end use. Since power plants are most often located outside of densely populated areas, the transmission system must be fairly large scale.  

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A network of transformers and transmission cables transfers electrical power from power stations to consumers is called as a transmission grid.

Electric power transmission is the bulk movement of electrical energy or power from a generating site, such as a big power plant, to an electrical substation or other places. The interconnected lines which facilitate this movement of electrical energy form a transmission network or transmission grid.

A transmission grid is a network of power stations, transmission lines, and the substations. Energy is generally transmitted within a grid through the three-phase AC. Single-phase AC is used only for distribution to end users however, it is not usable for the large polyphase induction motors. The two-phase transmission was used but it either required a four wires system or three wires with unequal currents. Higher order phase systems require more than three wires, but they cannot deliver little or no benefit.

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Students were asked about the speed of cars involved in an accident. When the verb was changed from "contacted" to "smashed", students were more likely to report that there was broken glass involved in the accident.

A verb is one of the parts of speech in English language and it can be defined as a type of word which is used to describe an action, occurrence, experience, or a state of existence such as, smashed, living, contacted, clean, drive, etc.

Speed can be defined as the distance covered by a physical object per unit of time. This ultimately implies that, the higher the speed of a car that is involved in a road crash or accident, the higher would be the level of impact and damage that would be caused.

In this context, we can reasonably infer and logically deduce that changing the verb from contacted to smashed, ultimately implies that the road crash or accident was ghastly and fatal and such would cause broken glasses in the cars that were involved.

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Complete Question:

Students were asked about the speed of cars involved in an accident. When the verb was changed from "contacted" to "smashed" ______,

students were more likely to report that there was broken glass involved in the accident

students were less likely to report that the cars were traveling at high speeds

students were more likely to report that no one was injured in the accident

there was no differences noted.

Answer:

Kinetic energy=1/2mvsquare

1/2 x 1400 x 25 x25

Therefore kinetic energy= 437500Joules

Explanation:

Answer:

437,500 Joules

Explanation:

KE= 1/2 × M

x V^2, where

M = Mass,

V = Velocity

KE = 1/2 × 1400 × 25^ 2

KE= 1/2 × 1400 × 625

KE = 437,500 Joules.

Lamar's average velocity is 1 m/s

We know that,

Average Velocity = Total distance travelled / Total time taken

Given that,

Distance travelled west = 20 m

Distance travelled East = 20 m

Total time taken = 40 s

Total distance travelled = 20 + 20 = 40 m

Average Velocity = 40 / 40 = 1 m/s

Average velocity is total rate of change of displacement.

Therefore, Lamar's average velocity is 1 m/s

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(a) The focal length of the mirror formed by the shiny back of a spoon that has a 3.00 cm radius of curvature is 1.50 cm. (b) Its power in diopters of the mirror is -66.67 diopters.

(a) To calculate the focal length (f) of the mirror formed by the shiny back of a spoon, you can use the formula:

f = R / 2

where R is the radius of curvature. In this case, R = 3.00 cm. Plugging this value into the formula, we get:

f = 3.00 cm / 2 = 1.50 cm

The focal length of the mirror formed by the shiny back of the spoon is 1.50 cm.

(b) The power of a lens or mirror is defined as the reciprocal of its focal length in meters, expressed in diopters (D).

To calculate the power (P) of the mirror in diopters, you can use the formula:

P = -1 / f

where f is the focal length in meters. First, convert the focal length from cm to meters:

f = 1.50 cm × (1 m / 100 cm) = 0.015 m

Now, plug this value into the formula:

P = -1 / 0.015 m = -66.67 diopters

The power of the mirror formed by the shiny back of the spoon is -66.67 diopters.

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Answer:

I have put the answer and solution in the files part!

Altitude of Earth's geostationary orbit is approximately 35,786 km above the surface of the Earth.

What is Geostationary?

Geostationary refers to an object in orbit around the Earth that appears to remain fixed in the same position above the Earth's surface. Specifically, a geostationary orbit is an orbit in which a satellite orbits the Earth at the same rate that the Earth rotates, so that the satellite appears to remain stationary relative to a fixed point on the Earth's surface.

The altitude of Earth's geostationary orbit can be found using the formula:

h = R(3/2) * √(M/m)

where:

h is the altitude of the geostationary orbit

R is the radius of the Earth

M is the mass of the Earth

m is the mass of the satellite

For a geostationary orbit, the satellite has a period of 24 hours, which means it orbits the Earth once every 24 hours. This requires the satellite to be at an altitude where its orbital period matches the Earth's rotational period, and this altitude is known as the geostationary orbit.

For a geostationary satellite, the mass of the satellite is negligible compared to the mass of the Earth, so we can assume that m is much smaller than M.

Plugging in the given values, we get:

h = (6.38 x 10^6 m) * (3/2) * √(5.97 x 10^24 kg / m)

h = 35,786 km

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Answer:

cm and cm²

Explanation:

volume is three dimensional

cm² is in relation to area and cm is in relation to the length of the object... to find the volume getting a base area times the length gives you volume of the object

(cm²×cm=cm³)... attempted illustration

Answer:

m³, cm³, km³

Explanation:

The frequency of oscillation for the spring system of part i is 0.719 Hz.

Explanation: The frequency of a system is a measure of the number of cycles it completes per second, which is proportional to the square root of the ratio of the spring constant to the mass of the system.

In this case, the spring constant is given as k=2.5 N/m and the mass of the system is given as m=0.35 kg. Plugging these values into the equation for frequency, we get frequency (f) = 1/2π * sqrt(k/m) = 1/2π * sqrt(2.5/0.35) = 0.719 Hz. This result can be rounded to three decimal places, giving us 0.719 Hz.

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The material that is not ferromagnetic is d. Ai (aluminium). While iron (Fe), cobalt (Co), and nickel (Ni) are ferromagnetic metals, aluminium is a non-magnetic metal.

Ferromagnetism is the ability of a material to become permanently magnetized when exposed to an external magnetic field. Ferromagnetic materials include iron (Fe), nickel (Ni), cobalt (Co), and some of their alloys, such as FeCo, FeNi, and FeCoNi. These materials have a magnetic moment that aligns with an external magnetic field, resulting in a net magnetic moment and magnetic behaviour. Aluminium, on the other hand, is not ferromagnetic and does not exhibit this type of behaviour.

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Answer:

Final volume, V2 = 3 Litres

Explanation:

Given the following data;

Initial volume, V1 = 1 litre

Initial temperature, T1 = 20°C

Final temperature, T2 = 60°C

To find the final volume, we would use Charles' law;

Charles states that when the pressure of an ideal gas is kept constant, the volume of the gas is directly proportional to the absolute temperature of the gas.

Mathematically, Charles is given by;

V1/T1 = V2/T2

Making V2 as the subject formula, we have;

V1T2 = V2T1

V2 = (V1T2)/T1

Substituting into the formula, we have;

V2 = (1 * 60)/20

V2 = 60/20

Final volume, V2 = 3 Litres

Answer:

The coefficient of kinetic friction between the crate and the floor can be calculated using the formula μ = Ff / N, where Ff is the frictional force, N is the normal force, and μ is the coefficient of kinetic friction.

In this case, the normal force is equal to the weight of the crate, which is 24 kg * 9.8 m/s2 = 235.2 N. The frictional force can be calculated using the formula Ff = μ * N, where μ is the coefficient of kinetic friction and N is the normal force.

If we substitute the values for N and Ff into the formula for the coefficient of kinetic friction, we get:μ = 53 N / 235.2 N = 0.225

Therefore, the coefficient of kinetic friction between the crate and the floor is 0.225.

Answer: changes will result from adjusting the temperatures of two sealed soda

Explanation:

the preasure builds up and makes the bottle expand so it might crack but the other one will become ice then will crack the sides

Answer:

changes

Explanation:

Answer:

To solve this problem, we need to use the coefficient of thermal expansion for gasoline, which tells us how much the volume of gasoline will increase as its temperature increases. The coefficient of thermal expansion for gasoline is approximately 950 x 10^-6 /°C.

Using this information, we can calculate the increase in volume of gasoline as it warms up from 15°C to 35°C:

ΔV = V * α * ΔT

where V is the initial volume of gasoline (60 L), α is the coefficient of thermal expansion for gasoline (950 x 10^-6 /°C), and ΔT is the change in temperature (20°C).

ΔV = 60 * 950 x 10^-6 * 20

ΔV = 0.114 L

Therefore, the amount of gasoline spilled as it warms up from 15°C to 35°C is:

60 L - 0.114 L = 59.886 L

Explanation:

So the answer is (A) 50.2 litre.

The cheetah that can accelerate from rest to a speed of 30.0 m/s in 7.00s has an acceleration of: 4.285 m/s²

The formula and procedure we will use to solve this exercise is:

a = (vf - vi) /t

Where:

Information about the problem:

Applying the acceleration formula we have:

a = (vf - vi) /t

a = (30.0 m/s - 0 m/s) /7.00 s

a = (30.0 m/s m/s) /7.00 s

a = 4.285 m/s²

It is a physical quantity that indicates the variation of velocity as a function of time, it is expressed in units of distance per time squared e.g.: m/sec2 ; km/h2

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Answer:

High water level during a tide is called High tide.

Low water level during a tide is called Low tide.

Answer:

It's in the vegetable food group

Explanation:

It's false, they're considered yo be part of the protein food group

Answer:

energy that is ponteaila

Explanation:

Answer:

To summarize, potential energy is the energy that is stored in an object due to its position relative to some zero position. An object possesses gravitational potential energy if it is positioned at a height above (or below) the zero height.

Explanation:

Hope this helps :D

By the law of universal gravitation, the gravitational force F between the satellite (mass m) and planet (mass M) is

F = G M m / R ²

where

• G = 6.67 × 10⁻¹¹ m³/(kg•s²) is the universal gravitation constant

• R = 2500 km + 5000 km = 7500 km is the distance between the satellite and the center of the planet

Solve for M :

M = F R ² / (G m)

M = ((3 × 10⁴ N) (75 × 10⁵ m)²) / (G (6 × 10³ kg))

M ≈ 2.8 × 10¹⁴ kg

Answer:

i need points

Explanation:

Answer:

See the explanation below.

Explanation:

By means of Hooke's second law, we can calculate the spring constant with the initial conditions of the problem.

\(F=k*x\)

where:

k = spring constant [N/m]

x = distance = 0.01 [m]

F = force or weight [N]

Weight can be calculated by means of the product of mass by gravitational acceleration.

m = mass = 500[g] = 0.5[kg]

\(W=F=m*g\\W = 0.5*9.81\\W= 4.905[N]\)

Now the spring constant can be calculated:

\(k=F/x\\k=4.905/0.01\\k = 490.5[N/m]\)

We must now use the same Hooke's law to determine the new spring force when stretching it 0.03 [m]

\(F_{new}=k*x\\F_{new}=490.5*0.03\\F_{new}=14.715[N]\)

Now we have to use Newton's second law to calculate acceleration. We must remember that Newton's Second Law tells us that the sum of forces is equal to the product of mass by acceleration.

\(F=m*a\)

where:

F = Fnew = 14.715[N]

m = mass = 500 [g] = 0.5 [kg]

a = acceleration [m/s²]

Now replacing:

\(14.715=0.5*a\\a=14.715/0.5\\a=29.43[m/s^{2} ]\)

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

mass = 15 kg

acceleration = 10 m/s²

Force = 15 × 10 = 150

We have the final answer as

Hope this helps you

Concrete must be carefully poured, mixed, cured, and tested to assure a safe building material. Option three is the most suitable answer

A cement is a binder, a substance used for construction that sets, hardens, and adheres to other materials to bind them together. Cement is seldom used on its own, but rather to bind sand and gravel together.

There are four stages in the manufacture of port land cement:

1) crushing and grinding the raw materials

2) blending the materials in the correct proportions

3) burning the prepared mix in a kiln

4) grinding the burned product, known as “clinker,” together with some 5 percent of gypsum (to control the time of set of the cement).

The three processes of manufacture are known as

a) wet

b) dry

c) semidry processes

So termed when the raw materials are ground wet and fed to the kiln as a slurry, ground dry and fed as a dry powder, or ground dry and then moistened to form nodules that are fed to the kiln.

The whole paragraph is a process that ensures formation of good quality cement and ensures formation of quality structures which are capable of withstanding time.

Therefore, Option three is the most suitable answer , Concrete must be carefully poured, mixed, cured, and tested to assure a safe building material.

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Answer:

a= 4m/s^2

t = 5 secs

v = at

v = 4 × 5

v =20 m/s

Answer:

2.5m/s1

Explanation:

The cost of petrol for the 160 km journey is N152

The cost of the petrol for the 160 km journey is calculated as follows:

Cost of petrol is N15, 20kobo per liter

Liters of petrol required for a 720 km journey = 45 liter

For a 1 km journey, liters of petrol required = 45/720

Liters of petrol required  for a 160 km journey = 45/720 * 160

Liters of petrol required  for a 160 km journey = 10 liters

Cost of petrol = 10 * 15, 20 kobo

Cost of petrol = N152

In conclusion, the cost of petrol for the 160 km journey is obtained by taking ratios.

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Physical activity in hot and humid environments challenges the body because it creates additional stress on the body's thermoregulatory system.

Here are some specific reasons why:

1. Increased heat stress: Hot and humid environments elevate the ambient temperature and humidity, making it harder for the body to dissipate heat. The body relies on evaporative cooling through sweating to maintain a stable core temperature. However, in high humidity, sweat evaporation is reduced, hindering the body's ability to cool down effectively. This can lead to increased heat accumulation and an increased risk of heat-related illnesses such as heat exhaustion or heatstroke.

2. Elevated heart rate and cardiovascular strain: Engaging in physical activity in hot and humid conditions requires the body to work harder to maintain its core temperature. This increased effort places additional demands on the cardiovascular system, as the heart must pump more blood to deliver oxygen to the working muscles and help dissipate heat. The combination of elevated core body temperature and increased cardiovascular strain can lead to higher heart rates and potential cardiovascular stress.

3. Dehydration: Sweating is the body's primary mechanism for cooling down in hot environments. However, in humid conditions, the sweat doesn't evaporate as efficiently, leading to increased fluid loss without a corresponding decrease in body temperature. This can lead to dehydration if fluid losses are not adequately replenished. Dehydration negatively affects physical performance, impairs thermoregulation, and increases the risk of heat-related illnesses.

4. Electrolyte imbalances: Sweat contains not only water but also electrolytes such as sodium, potassium, and chloride. In hot and humid environments, increased sweating can result in greater electrolyte losses. These electrolytes are essential for maintaining proper nerve and muscle function. Imbalances in electrolyte levels can lead to muscle cramps, fatigue, and impaired physical performance.

5. Reduced exercise capacity: The combined effects of increased heat stress, cardiovascular strain, dehydration, and electrolyte imbalances can significantly reduce exercise capacity in hot and humid conditions. It becomes harder for the body to sustain high-intensity physical activity, resulting in decreased endurance, reduced power output, and slower recovery times.

To mitigate the challenges posed by physical activity in hot and humid environments, it is crucial to prioritize proper hydration, adequate rest breaks, wearing lightweight and breathable clothing, and acclimating gradually to the conditions.

Additionally, being aware of the signs and symptoms of heat-related illnesses and taking appropriate measures to cool down and seek medical attention if necessary are essential for maintaining safety and well-being during exercise in hot and humid environments.

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The more  a star has, the shorter its main sequence life. "The mass-luminosity relation, which is used to describe the relationship between a star's mass and its luminosity, tells us that the more massive a star is, the brighter it is.

However, the mass of a star also determines how long it spends on the main sequence. A star spends most of its life in the main sequence, a stage during which it fuses hydrogen in its core to produce helium. The amount of time a star spends on the main sequence is determined by its mass, with more massive stars having shorter lifetimes than less mass stars.

As a result, the more massive a star is, the shorter its main speed life, which means that option D, "the more mass a star has, the shorter its main sequence life," is the correct answer. The other options, "all stars have the same ages," "all stars have equal life spans," and "none of the above," are all incorrect because they do not accurately describe the relationship between a star's mass and its main sequence lifetime.

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Answer:

Gravitational potential

Explanation:

Any object that is not on the surface of the Earth, but at a height instead has potential energy. Eventually, this can become kinetic energy once the object falls.

When an object is in a gravitational field, it has energy in its gravitational potential energy store.

Answer:

The difference in tension,  between adjacent sections of the pull cable at the given conditions is 17.701 kN

Explanation:

We take the cars as moving upwards such that the resultant pulling force on the car, F, along the cable is given by the relation

\(F_{car}\) = Upward tension force,  \(Tension_{(upwards)}\) - Downward tension force, \(Tension_{(downwards)}\) - Component of the weight of the car along the taut cable

The parameters given are;

Mass of car, m = 2750 kg

Angle of inclination of taut cables, θ = 35°

The upward acceleration of the car, a = 0.81 m/s²

Given that the weight is acting vertically downwards, we have;

Component of the weight of the car along the taut cable = m × g × sin(θ)

∴ Component of the weight of the car along the taut cable = 2750 × 9.81 × sin (35°) = 15473.66 N

We therefore have;

\(F_{car}\) =  \(Tension_{(upwards)}\) - \(Tension_{(downwards)}\) - 15473.66 N

\(F_{car}\)  = m × a = 2750 × 0.81 =  \(T_{upwards}\) - \(T_{downwards}\) - 15473.66

∴  \(Tension_{(upwards)}\) - \(Tension_{(downwards)}\) = 2750 × 0.81 + 15473.66 = 17701.16 N

Hence the difference in tension,  \(Tension_{(upwards)}\) - \(Tension_{(downwards)}\) between adjacent sections of the pull cable if the cars are at the maximum permissible mass and are being accelerated up the incline = 17701.16 N or 17.701 kN.