near one end of an electrically neutral aluminium rod lying on a table made of non conducting material ,you hold a comb that is also made of non conducting material .does a small still sphere located near the other end of the sphere

Oldowan tools, named after their discovery at Olduvai Gorge in Tanzania, are characterized by their simple and crude nature. They primarily consist of stone flakes and cores, with minimal shaping and retouching.

Oldowan tools represent the earliest stone tool industry and are associated with early hominins, particularly Homo habilis. These tools were used by our early ancestors around 2.6 million years ago. Oldowan tools are characterized by their simplicity and crude nature. They primarily consist of stone flakes and cores, which were created by striking one stone against another to produce sharp edges. These flakes were often used as simple cutting tools or as cores from which additional flakes could be struck. The tools were typically made from locally available raw materials such as basalt, quartz, or chert. Oldowan tools were not highly shaped or retouched, reflecting the early stage of tool-making technology during this period. Despite their simplicity, these tools were significant innovations that enabled early hominins to access and process resources more efficiently, contributing to their survival and adaptation in their environments.

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The identity of a monoatomic gas can be determined by calculating its average thermal velocity using the given temperature. In this case, if the average thermal velocity is 245 m/s at 100 °C, the gas is most likely helium (He).

The average thermal velocity of a gas is related to its temperature and molecular mass. For monoatomic gases, the relationship is given by the equation:

v_avg = sqrt((3kT) / m)

Where:

v_avg is the average thermal velocity

k is the Boltzmann constant

T is the temperature in Kelvin

m is the molecular mass of the gas

To find the identity of the gas, we can rearrange the equation:

m = (3kT) / v_avg²

Given that the temperature is 100 °C, we need to convert it to Kelvin:

T = 100 + 273.15 = 373.15 K

Substituting the values into the equation:

m = (3 * 1.38e-23 * 373.15) / (245²)

After performing the calculations, we find that the molecular mass of the gas is approximately 4 atomic mass units (u). This corresponds to the molecular mass of helium (He), indicating that the gas in question is helium.

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The speedboat momentum is 19,500 kg.m/s.

We need to know about momentum to solve this problem. Momentum can be defined as the degree of difficulty to stop a moving object. It can be determined by

P = m . v

where P is momentum (kgm/s), m is mass (kg) and v is velocity (m/s).

From the question above, we know that:

m = 1500 kg

v = 13 m / s

By substituting the given parameters, we can calculate the momentum

P = m . v

P = 1500 . 13

P = 19,500 kg . m / s

Hence, the speedboat momentum is 19,500 kg.m/s.

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Answer:19,500 kg

Explanation:your welcome!:)

Answer:

Energy stored, E = 5929 J

Explanation:

Given that,

The mass of a test dummy, m = 55 kg

It is launched 11 m into the air.

We need to find the energy stored in the bungee cords. It can be calculated as follows :

\(E=mgh\\\\E=55\times 9.8\times 11\\\\E=5929\ J\)

So, 5929 J of energy is stored in the bungee cords.

There is a lot of variation in people's hearing abilities, and some individuals may be able to hear certain frequencies at lower levels than others.

First, it's important to understand what the terms "threshold" and "frequency" mean in relation to hearing. Threshold refers to the lowest level of sound that a person can hear, while frequency refers to the pitch of a sound wave, measured in hertz (Hz).

Now, to answer the question: a hearing test can show that a person's threshold of hearing is 0 dB at 250 Hz, even though the figure on the front side implies that no one can hear such a frequency at less than 20 dB, because the figure on the front side refers to the average hearing threshold across the entire population.

In reality, there is a lot of variation in people's hearing abilities, and some individuals may be able to hear certain frequencies at lower levels than others. Additionally, the hearing test measures the individual's hearing threshold specifically, rather than relying on population averages.

So while it may be true that the average person cannot hear a frequency at less than 20 dB, some individuals may have exceptional hearing abilities that allow them to detect sounds at lower levels. It's important to note, however, that this is not the case for everyone and should not be used to dismiss concerns about hearing loss or other auditory issues.

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Answer:

The answer is 12

Explanation:

Just divide 42/3.5

When the object is placed between the focal point and a convex lens, the image it produces contains these characteristics:

A convex lens (converging lens) is a type of lens that is thicker at the center and thinner at the edges. It bends light from distant objects inward toward a point (focal point). A convex lens is generally used to correct farsightedness.

There's three rules for the ray path passing through convex lens

When those rules is applied to know how the image is produced when an object is placed between the focal point and the lens, you'd find out that the image produced is virtual (located on the same side as the object), upright, and magnified.

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A strong magnetic field prevented the creation of charged particles or ions.

This is because the magnetic field exerts a force on charged particles, causing them to move in a circular path around the field lines, which in turn prevents them from combining and forming new particles or ions.

A strong magnetic field can have various effects on the physical and chemical processes occurring within a system, and can sometimes prevent the creation or modification of certain materials or structures.

One example of this is in the field of material science and engineering, where magnetic fields can be used to control the growth and alignment of crystalline structures in materials.

In some cases, a strong magnetic field can prevent the creation of certain materials altogether.

For example, when attempting to produce graphene using chemical vapor deposition (CVD), a strong magnetic field can disrupt the growth process and prevent the formation of the desired structure.

This is because the magnetic field can affect the movement and orientation of the precursor molecules, leading to a non-uniform growth pattern and the formation of defects in the graphene lattice.

Similarly, in certain chemical reactions, a strong magnetic field can alter the rate and outcome of the reaction, making it difficult or impossible to create certain products.

This is because the magnetic field can affect the spin states of the reacting molecules and alter their reactivity and selectivity.

Overall, a strong magnetic field can have significant and sometimes unpredictable effects on the creation and modification of materials and chemicals, and must be carefully considered and controlled in many research and industrial processes.

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The Lazarus mission was mentioned to be around 10 years ago in the movie Interstellar. It takes approximately 6 years to travel from Earth to Saturn. Copper and Dr. Brand were on Miller's planet for approximately 23 years. This means that the total time Dr. Mann went without human contact is estimated to be around 33 years.

It is stated in the movie that it takes approximately 6 years to travel from Earth to Saturn, where the wormhole that leads to other galaxies was located. This indicates that the Lazarus mission likely took 6 years to reach Saturn from Earth.

During the Lazarus mission, two of its members, Dr. Mann and Dr. Brand, were sent to explore separate planets that were potentially suitable for human colonization. Dr. Mann was sent to a planet named Mann's planet, while Dr. Brand was sent to Miller's planet.

On Miller's planet, time was significantly dilated due to its proximity to a massive black hole, known as Gargantua. For every hour that passed on the planet, approximately 7 years passed outside the planet's gravitational influence.

This means that the time Dr. Brand and the other crew members spent on Miller's planet felt like 23 years had passed for the rest of the universe.

Considering the 6-year journey to Saturn, the time spent on Miller's planet, and the 10 years that had already passed since the Lazarus mission, the total time that Dr. Mann went without human contact can be estimated to be around 33 years.

This is derived from adding the 6-year journey, the 23 years on Miller's planet, and the 10 years prior to the Lazarus mission.

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The answer for the missing labeling as (i) and (ii) will be (i)thermometer and (ii)condenser.

A burner is a device intended to guarantee that the flame is stabilized.

By creating a proper flow field to cause the initial temperature rise, a  The fuel/air combination is heated from within the flame to the ignition temperature.

When the flame or heat is created in fuel-burning or heat-generating equipment.

Wood, coal, kerosene, LPG, petrol, and diesel are a few of the often utilized fuels. In order to cook, heat, power vehicles, and create electricity, we utilize fuels.

The barrel, collar, air holes, gas intake, gas valve, and base are the different pieces of a Bunsen burner. Each component is essential to the process of creating a flame.

Hence, the answers for the missing labeling will be  (i) thermometer and (ii) condenser.

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The parts found in an electric generator for the conversion of electric energy into other forms of energy such as mechanical or chemical energy are an armature, a permanent magnet, an electromagnet brushes, and slip rings.

An electric generator is a device that converts motive power into electric power for use in an external circuit.

Parts of electric generators include the following;

These parts of electric generator helps in the generation of electricity or conversion of electric energy into mechanical energy or light energy or chemical energy.

Thus, the parts found in an electric generator for the conversion of electric energy into other forms of energy such as mechanical or chemical energy are an armature, a permanent magnet, an electromagnet brushes, and slip rings.

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Answer:

armature

permanent magnet

electromagnet

brushes

slip rings

Explanation:

edge 2022-2023

Answer:

a) 12614.4 m^3

b) 28.8 m

Explanation:

The complete question is

Four astronauts are in a spherical space station. (a) If, as is typical, each of them breathes about 500 cm^3 of air with each breath, approximately what volume of air (in cubic meters) do these astronauts breathe in a year? (b) What would the diameter (in meters) of the space station have to be to contain all this air?

The average breathing rate is 12 breaths per minute

there are 60 minutes x 24 hours x 365 days in a year = 525600 minutes in a year

if an average human takes 12 breath per minute, then in a year an average human take 12 x 525600 = 6307200 breath

For the four astronauts, the amount of breath = 4 x 6307200 = 25228800 breath in total.

The volume of air per breath = 500 cm^3

1 cm^3 = 10^-6 m^3

500 cm^3 = \(x\) m^3

\(x\) = 500 x 10^-6 = 5 x 10^-4 m^3

Therefore in a year, the volume of these astronauts breath in a year = 5 x 10^-4 x 25228800 = 12614.4 m^3

b) If the space station is spherical, the volume will be given as = \(\frac{4}{3} \pi r^3\)

where r is the radius of the space station

This volume of the space station must be able to contain all the volume of breath produced by the astronauts which is = 12614.4 m^3

Equating, we have

12614.4 = \(\frac{4}{3} \pi r^3\)

12614.4 = \(\frac{4}{3}*3.142*r^3\)

12614.4 = 4.1893\(r^{3}\)

\(r^{3}\) = 12614.4/4.1893 = 3011.1

r = \(\sqrt[3]{3011.1}\) = 14.4 m

diameter of the space station = 14.4 m x 2 =  28.8 m

Answer:

The object would continue to move upwards at the same angle.

Explanation:

Gravity is (generally) the only force acting on an object. To take this away, you would have no forces acting on the object.

According to Newton's 1st Law, it would therefore continue moving indefinitely.

I hope this helps!

A rocky, metallic object in the Sun's orbit is called an asteroid. It is bigger than a meteoroid but smaller than a planet in size.

The asteroid belt, a region in our solar system that lies between Mars and Jupiter's orbits, is where the majority of asteroids are found. The wide array of oddly shaped asteroids that make up the asteroid belt range in size from microscopic rocky fragments to massive things with diameters of several hundred kilometres. However, asteroids can also be discovered in other places, including as in the outer solar system and in orbits that are close to the Earth. They are leftovers from the solar system's early development and can be used to learn more about the system's past and current makeup.

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An asteroid is a stony or metallic object that orbits the Sun, is smaller than a planet, and lacks an atmosphere. Most asteroids are found in the asteroid belt, which lies between the orbits of Mars and Jupiter. Despite the asteroid belt house a large number of these celestial bodies, they are not closely spaced, allowing spacecraft to navigate through without collisions.

An asteroid is a stony or metallic object orbiting the Sun that is smaller than a planet and shows no evidence of an atmosphere or other types of activity associated with comets.

The majority of asteroids are located in the asteroid belt, a region of the solar system between the orbits of Mars and Jupiter. This main belt is where the orbits are generally the most stable, extending from 2.2 to 3.3 AU from the Sun. While this area contains over 75% of all known asteroids, they are not closely spaced. The typical spacing between such objects down to 1 kilometer in size is actually several million kilometers. This vast distance between asteroids is why spacecraft like Galileo, Cassini, Rosetta, and New Horizons have been able to travel through the asteroid belt without collision.

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Answer:

Soft serve ice cream

Explanation:

1g fat = 9 calories

take the fat numbers for each option and multiple by 9 and see who gives you 101

vanilla ice cream = 11.2 x 9 = 100.8 rounded to 101

frozen yogurt = 4 x 9 = 36

French fries = 24.7 x 9 = 222.3

pretzels = 1 x 9 = 9

Answer:

False

Explanation:

A convergent plate boundary formed the Himalaya Mountains.

An individual skilled in water operations and amphibious techniques, as well as trained on motorcycles, is commonly known as a Marine Special Operations Team (MSOT) member.

These individuals undergo rigorous training in waterborne operations, including swimming, diving, and boat handling, as well as specialized motorcycle training for reconnaissance and mobility purposes.

MSOT members are often assigned to perform unconventional warfare operations in hostile environments and require a high level of physical and mental conditioning to succeed in their missions.

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If a resistance is added in parallel to a circuit, the circuit resistance will become less.

This is because when resistors are added in parallel, the total resistance decreases due to an increase in the number of paths for the current to flow. In a parallel circuit, the voltage across each resistor is the same, but the current is divided among the resistors. This means that as more resistors are added in parallel, the total current increases, which in turn reduces the total resistance. In essence, adding resistors in parallel makes it easier for current to flow through the circuit and reduces the overall resistance. So, if a resistance is added in parallel to a circuit, the circuit resistance will be less than the original value before the resistor was added.

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No, the sun cannot explain global warming. Global warming is a phenomenon in which the temperature of the Earth's surface and atmosphere is rising continuously due to human activities such as deforestation, burning of fossil fuels, and industrialization.

This increase in temperature cannot be explained only by an increase in solar radiation.There are several factors which contribute to global warming, including greenhouse gases such as carbon dioxide, methane, and water vapor. These gases trap heat in the Earth's atmosphere, which causes the planet's temperature to rise. The sun's radiation does contribute to global warming, but it is not the main cause.

i) To calculate the increase in solar radiation that would cause the Earth to warm up by 1 K, we can use the following formula:ΔS = ΔT / αWhere ΔS is the increase in solar constant, ΔT is the increase in temperature, and α is the Earth's albedo (reflectivity).α = 0.30 is the standard value used for the Earth's albedo.ΔS = ΔT / αΔS = 1 K / 0.30ΔS = 3.33 W/m2So, to explain the increase in temperature of 1 K over the last hundred years, the solar constant would need to increase by 3.33 W/m2.

ii) The observed fluctuation of the solar constant over the past 400 years has been around 0.1% to 0.2%. This is much smaller than the 3.33 W/m2 required to explain the increase in temperature of 1 K over the last hundred years. Therefore, it is unlikely that the sun is the main cause of global warming.

The sun cannot explain global warming. While the sun's radiation does contribute to global warming, it is not the main cause. The main cause of global warming is human activities, particularly the burning of fossil fuels, which release large amounts of greenhouse gases into the atmosphere.

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Given,

The initial height of the soccer ball, h₁=6 ft

The initial velocity of the ball, u=96 ft/s

The acceleration due to gravity, g=-32 ft/s

When the ball reaches the maximum height, its velocity will reduce to zero.

Thus the velocity of the ball when it is at its maximum height is v=0 ft/s

From the equation of motion,

Where h₂ is the total height covered by the ball from its initial height to reach its maximum height.

On substituting the known values,

Thus the maximum height reached by the ball is,

Thus the maximum height reached by the ball is 150 ft.

The efficiency of a certain engine can be determined using the Carnot Cycle equation. The efficiency of an engine is proportional to the difference in temperature between the hot reservoir and the cold reservoir.

The efficiency can be calculated using the following formula:

η = (Th - Tc) / ThWhere,η = efficiency of the engine

Th = temperature of the hot reservoir

Tc = temperature of the cold reservoir

Given that the temperature of the hot reservoir is 700°C and the temperature of the cold reservoir is 230°C.

Therefore,η = (700 - 230) / 700η = 0.67The efficiency of the engine is 0.67 or 67%. In other words, only 67% of the heat energy is converted into mechanical energy while the remaining 33% is lost as waste heat.

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Answer:

Gamma

Explanation:

The emission of light from a radioisotope occurs during Gamma decay.

Hence , the correct answer is Gamma decay .

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Therefore for cart to stay here on track when it arrives at point P, the net force applied to it must be greater or equal than for the heaviness of the cart.

The force is an impact that has the power to alter an object's motion. A mass-containing object's velocity can be altered by a force. An obvious way to describe force is as a pushed or a pull. A vector quantity is called a force since it has both strength and the direction.

The strongest force in existence is thought to be the strong force. The gravitation, weak, and electromagnetism forces come after it in lowest to highest.

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Based on the information given, the technician that's correct regarding the resistance measurement between the wires is Technician A.

It should be noted that a technician simply means an individual that's in charge of looking after the technical equipment in an organization.

In this case, Technician A is correct. Technician B is incorrect as zero-ohm doesn't indicate an open circuit in the network but rather, a complete circuit.

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Five activities that will see the application of relation between pressure and area include:

When the handle of a pump is squeezed, the pressure inside the tire increases, causing the tire to inflate. By adjusting the size of the opening in the showerhead, the water pressure can be increased or decreased.

When a car is placed on a hydraulic lift, the pressure in the lift's cylinder is increased, causing the lift to raise the car off the ground. When a hydraulic jack is used to lift a heavy object, the pressure in the jack's cylinder is increased, causing the jack to lift the object.

A blood pressure cuff uses pressure to measure the blood pressure in a person's artery. The pressure in the cuff is increased until it is high enough to stop the flow of blood, and then the pressure is slowly released. The pressure readings at various points during this process can be used to determine a person's blood pressure.

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The resistance of this copper wire is R = 0.000227 Ω

We want to find the resistance of a copper wire, so we can use the formula:

R = (ρ * L) / A

Where the variables are:

Given:

Length of the copper wire (L) = 3.4 m

Diameter of the wire = 1.6 mm

First, let's calculate the cross-sectional area (A) of the wire using the diameter:

Radius (r) = diameter / 2 = 1.6 mm / 2 = 0.8 mm = 0.0008 m

Area (A) = π * r² = π * (0.0008 m)²

Now, let's substitute the values into the resistance formula:

R = (1.68 × 10⁻⁸ Ω⋅m * 3.4 m) / (π * (0.0008 m)²)

R = 0.000227 Ω

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Answer:Sonar, short for Sound Navigation and Ranging, is helpful for exploring and mapping the ocean because sound waves travel farther in the water than do radar and light waves.

Answer:

Kinetic Energy = 1/2 mass*velocity^2

K=1/2mv^2

Therefore if you reduce the speed of an object by 1/2, K reduced to 1/4 its value.

A photon is a fundamental particle of light and electromagnetic radiation, which is a quantum of electromagnetic energy that behaves like a particle and a wave.

Photons have no mass and no electric charge, they can be absorbed or emitted by matter, and the energy of a photon is directly proportional to its frequency and inversely proportional to its wavelength and they play a vital role in many physical processes, such as the emission and absorption of light, the photoelectric effect, etc., that are important in many areas of modern technology, including solar cells, etc.

Hence, a photon is a fundamental particle of light and electromagnetic radiation.

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