A horizontal force F is used to pull a 5-kilogram block across afloor at a constant speed of 3 meters per second. The frictionalforce between the block and the floor is 10 newtons. The work doneby the force F in 1 minute is most nearlyA. 0 JB. 30 JC. 600 JD. 1350 JE. 1800 J

Answer: The velocity of released alpha particle is \(1.127\times 10^7m/s\)

Explanation:

According to law of conservation of momentum, momentum can neither be created nor be destroyed until and unless, an external force is applied.

For a system:

\(m_1v_1=m_2v_2\)

where,

\(m_1\text{ and }v_1\) = Initial mass and velocity

\(m_2\text{ and }v_2\) = Final mass and velocity

We are given:

\(m_1=238u\\v_1=1.895\times 10^{5}m/s\\m_2=4u\text{ (Mass of }\alpha \text{ -particle)}\\v_2=?m/s\)

Putting values in above equation, we get:

\(238\times 1.895\times 10^5=4\times v_2\\\\v_2=\frac{238\times 1.895\times 10^5}{4}=1.127\times 10^7m/s\)

Hence, the velocity of released alpha particle is \(1.127\times 10^7m/s\)

m = nM

m = 6mol(16g/mol)

m = 96g

*M is molar mass, which is found on the periodic table

Answer:

hydrometer

Explanation:

A hydrometer is an instrument used to determine specific gravity. It operates based on the Archimedes principle that a solid body displaces its own weight within a liquid in which it floats. Hydrometers can be divided into two general classes: liquids heavier than water and liquids lighter than water.

Answer:

true

Explanation:

because global helps local

The reading on the scale is equal to the weight of the student which is 646.8 N.

The given parameters;

The reading on the scale is determined by applying Newton's second law of motion as follows;

\(R = ma+ mg\\\\R = m(a + g)\\\\R = m(0 + g)\\\\R = mg\)

The student is at rest and not accelerating, a =0

\(R = 66 \times 9.8\\\\R = 646.8 \ N\)

Thus, the reading on the scale is equal to the weight of the student which is 646.8 N.

The complete question is below:

A 66 kg student stands on a very light, rigid board that rests on a bathroom scale at each end as shown in (Figure 1). what is the reading on the scale?

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First paragraph: True. When a constant force is applied to an object, the acceleration of the object varies inversely with its mass.

Second paragraph: According to the given information, when a constant force is applied to an object with a mass of 3 kg, the acceleration is 26 m/s².

Let's denote the force as F₁. Using Newton's second law of motion, F = ma, where F is the force applied, m is the mass of the object, and a is the acceleration.

So we have F₁ = 3 kg * 26 m/s², which gives us F₁ = 78 N.

Now, if we consider the same force acting on another object with an unknown mass, but an acceleration of 6 m/s², we can denote the mass as m₂.

Using the same equation, F = ma, and substituting the given values, we have 78 N = m₂ * 6 m/s². Solving for m₂, we divide both sides by 6 m/s², resulting in m₂ = 78 N / 6 m/s².

Therefore, the mass of the second object is approximately 13 kg.

In summary, when a constant force is applied to an object, the acceleration of the object varies inversely with its mass. By comparing the given accelerations and using Newton's second law of motion, we can determine the mass of the second object to be approximately 13 kg.

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The type of electromagnetic radiation associated with the peak at 278 nm is ultraviolet radiation.

Electromagnetic radiation refers to waves of the electromagnetic field that propagate through space, carrying energy. These waves have a broad spectrum of wavelengths, and the different types of radiation are classified by their wavelengths. A peak at 278 nm corresponds to a specific wavelength within the electromagnetic spectrum.

The wavelength of 278 nm falls within the ultraviolet (UV) range, which typically spans from 10 nm to 400 nm. Therefore, the type of electromagnetic radiation associated with the peak at 278 nm is ultraviolet radiation.

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The nuisance doctrine is a legal principle that says someone who moves into a place knowing there is a nuisance there cannot later complain about the nuisance and demand compensation for it.

When a homeowner lives close to an airport, it is widely accepted that homeowner should have been aware of the potential noise and other disruptions connected with living close to an airport if the airport was already operational when the homeowner moved in. Such circumstances may make it more difficult for a homeowner to successfully file a claim for compensation based on noise pollution or other airport-related problems.

A stronger case might be made for compensation based on increased noise pollution and other negative effects caused by the airport if a homeowner moved into the neighbourhood before the airport was established and had no knowledge of or reasonable expectation of its construction. This is due to the fact that instead of "coming to the nuisance," they encountered a change in their surroundings after already settling down.

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Explanation:

African and south American plate is correct

The frequency range of electromagnetic waves of X-ray is 3 ×10¹⁶ Hz to  3 ×10¹⁹ Hz. The wavelength range of electromagnetic waves of X-ray is  0.01 nm t0 10 nm.

The electromagnetic spectrum of electromagnetic waves can be described as the range of frequencies of electromagnetic radiation and its wavelengths and photon energies. The electromagnetic spectrum have range from one Hertz to above 10²⁵ Hertz.

The wavelength of electromagnetic radiation lies in between 380 to 760 nm and is detected by the human eye and characterized as visible light.

Electromagnetic waves of each frequency band are known by different names; starting at the low frequency (long wavelength) end of the spectrum these are radio waves, microwaves, infrared (IR), visible light, UV, X-rays, and gamma rays at the high-frequency (short wavelength) end.

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Answer:

The velocity is \(u = 19.1 \ m/s\)  

Explanation:

From the question we are told that

  The time taken by the ball is  t =  2.5 seconds

  The angle made with the horizontal is \(\theta = 40^o\)

Generally the vertical component of the initial velocity is mathematically represented as

         \(u_y = u sin (\theta )\)

Generally at maximum height of the ball the velocity is  v  =  0 m/s and  the time take to reach this maximum height is

    =>         \(t_m = \frac{t}{2} = \frac{2.5}{2} = 1.245 \ s\)  [This because t is duration for the to a fro travel of the ball]

Generally from kinematic equation

        \(v = u_y + gt\)

Here  \(g = -9.8 m/s^2\) given that the direction is against gravity

=>     \(0 = u sin (40) - 9.8 * [1.25]\)

=>     \(0 = 0.6428u - 12.25\)  

=>     \(u = 19.1 \ m/s\)  

The tension is in each rope will be 230.535 N .

Tension also known as tensile force is the force developed in a rope, string, or cable when it is stretched by an applied force.

Mass of the gymnast = m = 47 kg

Acceleration due to gravity = g = 9.81 \(m/s^{2}\)

T = m*g

T = 47 * 9.81

T = 461.07 N

Since there are two parallel ropes attached to the ceiling, therefore tension will be equally divided into each rope respectively.

Tension in each rope = t

t = \(\frac{T}{2}\)

t = \(\frac{461.07}{2}\)

t = 230.535 N

The tension in each rope will be 230.535 N, when both the ropes are attached to the ceiling directly above the gymnast.

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Answer:

A change in quantity demanded refers to a variation in the amount of a good or service that consumers are willing and able to purchase, given the same price. The change in quantity demanded can be either an increase or a decrease.

Explanation:

There are several factors that can cause a change in quantity demanded:

Price change: A change in the price of a good or service can cause a change in the quantity demanded. If the price of a good or service increases, the quantity demanded will decrease (assuming everything else remains constant), and if the price decreases, the quantity demanded will increase.

Income: A change in consumer income can cause a change in the quantity demanded. If income increases, consumers may be able to afford to buy more of a good or service, which will cause the quantity demanded to increase. If income decreases, consumers may not be able to afford as much, which will cause the quantity demanded to decrease.

Tastes and preferences: Changes in tastes and preferences can also cause a change in quantity demanded. For example, if a new trend or fashion becomes popular, consumers may start to demand more of the goods or services associated with that trend.

Expectations: Consumers' expectations about future prices, availability, and income can also cause changes in the quantity demanded. For example, if consumers expect the price of a good or service to increase in the future, they may buy more of it now, which will cause the quantity demanded to increase.

Number of buyers: The number of buyers in the market can also affect the quantity demanded. An increase in the number of buyers will increase the quantity demanded, while a decrease will decrease the quantity demanded.

Answer:

=2 000 000 Litres

Explanation:

Density=mass/volume

1000kg/m^3=0.50×Volume

Volume=2000m^3

apparently I searched it up and

1m^3=1000 litres.

The Wireless Spectrum spans a wide range of frequencies, from as low as 9 KHz to as high as 300 GHz. This spectrum is a limited resource, and as demand for wireless communications continues to grow, there is an increasing need to manage and allocate the available frequencies effectively.

Different frequencies are used for different wireless technologies, with lower frequencies typically used for long-range communication and higher frequencies used for shorter-range communication with higher data rates. In order to avoid interference between different wireless systems, regulators allocate specific frequency bands for specific uses, such as cellular networks, Wi-Fi, and Bluetooth. With the ongoing development of new wireless technologies, including 5G and IoT, managing the Wireless Spectrum and allocating frequencies will remain a critical challenge for regulators and industry stakeholders alike.

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Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

\(k = \frac{1}{2} m {v}^{2} \\\)

m is the mass

v is the velocity

From the question we have

\(k = \frac{1}{2} \times 1400 \times {30}^{2} \\ = 700 \times 900 \\ = 630000\)

We have the final answer as

Hope this helps you

Answer:

Geothermal energy is heat that is generated within the Earth. It is a renewable resource that can be harvested for human use.

the location of the following countries are very near to sea level giving them easy access to the energy.

This is what I think is the answer.

pls tell me if any mistakes..

I hope it was helpful..

i will say that 32.2m s2 bt am not sure

Answer:

It would not be safe to walk out to where waves are breaking due to the effect of rip currents

Explanation:

The water depth in the surf zone is between 5 to 10 meters deep and with a wavelength of 30 meters, the speed of the wave is considerably fast such that control for safety may be difficult

Also the speed of the wave is directly related to the depth of the water which means that where the wave described above is fast as well as the rip current, also the water depth is expected to be considerable for a non swimmer

It is best to seek for sign post regarding safe areas and do not go into the water where there are no lifeguards or marked safe zones.

It won't be safe to walk out to where the waves are breaking.

This is because the wavelength is 30 meters which is a characteristic of

areas with significant water depth in the range of 5-11 meters.Under these

conditions the waves are usually very fast and may get swept with the

current from the water waves when trying to run from it.

It is recommended that we stay in areas where the depth is noted as not

being much and should always seek help and clarity from the life guards so

as to prevent drowning and death.

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The uterus lining is rebuilt by the end of the menstrual period. The rebuilding of the uterus lining starts after menstruation and the lining is typically completely rebuilt by day 14 of the menstrual cycle, which is when ovulation occurs and the uterus is preparing to potentially receive a fertilized egg.

The endometrium is the inner lining of the uterus, and it thickens every month to prepare for pregnancy. After menstruation, the endometrium grows and thickens to prepare for the implantation of a fertilized egg. The cells in the lining multiply and enlarge, and the glands in the lining begin to secrete mucus and other substances that help support the fertilized egg and promote its growth.

The rebuilding of the endometrium usually takes about two weeks after menstruation. This process is closely regulated by hormones such as estrogen and progesterone, which are produced by the ovaries and other parts of the body. These hormones help control the growth and development of the endometrium and other reproductive tissues.

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When a shaft of light approaches a smooth polished face and the light shaft bounces back, it's called the reflection of light. The incident light shaft which lands upon the face is said to be reflected off the face. The shaft that bounces back is called the reflected shaft.

When light is reflected on a aeroplane face the angle of reflection is equal to the angle of prevalence i.e. θr = θi.

Angle of prevalence is the angle between the incident shaft and the reflecting face.

Angle of reflection

This is the angle between the reflected shaft and the normal shaft on a reflecting face.

Angle of reflection is analogous to angle of prevalence.

Thus, the reflection of light is the shaft that hits the face and reflects back to the atmosphere.

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Both are dangerous on their own, but as they float through the air in Southern California's sunny climate, the sun bakes them into a new molecule called ozone, better known as smog.

Smog development and infiltration over Los Angeles. haze and air pollution in the entire community.

Burning sulfur-containing fossil fuels, particularly coal, causes sulfurous smog, also referred to as "London smog," which is characterized by a high concentration of sulfur oxides in the atmosphere.

The two primary substances in automotive exhaust are nitrogen oxides, which are created in scorching internal combustion engines, and hydrocarbons, which are derived from gasoline.

Therefore, Both are dangerous on their own, but as they float through the air in Southern California's sunny climate, the sun bakes them into a new molecule called ozone, better known as smog.

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Answer:

300

Explanation:

15 * 20 = 30

15 *

20 =

——

300

Answer:

Explanation:

C

In charging by induction, a charged object is brought near an object without touching it. The presence of the charge object induces electron movement and a polarization of the object. Then conducting pathway to ground is established and electron movement occurs between the object and the ground. During the process, the charged object is never touched to the object being charged.

The earth receives energy from the sun in one day than all the energy consumed by humans in one year.

The sun provides around 174 petawatts of energy to Earth, of which 89 petawatts is absorbed by the planet.

The Global energy consumption is roughly 15 terawatts annually.

Thus, we can conclude that, the earth receives energy from the sun in one day than all the energy consumed by humans in one year.

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