2.A girl of mass 50kg climbs a flight of a stair having 40steps each of 30m high in 10 s. Calculate the power developed by the girl.​

Answer:

17N

Explanation:

the side with most net force is going to be deducted by the side with the least net force.

For someone with a negative Weber slope for weight detection, it would be easier to tell the difference between 20 pounds and 21 pounds.

The Weber's Law states that the just noticeable difference (JND) between two stimuli is proportional to the magnitude of the stimuli. A negative Weber slope indicates that the JND decreases as the magnitude of the stimuli increases. In this case, as the weight increases, the person's ability to discriminate between the weights becomes easier.

Therefore, option C, telling the difference between 20 pounds and 21 pounds, would be easier for someone with a negative Weber slope for weight detection.

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Answer: False.Machine efficiency is a measure of how much work is produced by a machine compared to how much energy is required to operate the machine.

The ratio of useful output work divided by the total input work is known as machine efficiency. This number is frequently expressed as a percentage (100 x work output / work input).Example:

For example, if you lift a 50-pound weight 10 feet in the air using a pulley, the work done is 500 foot-pounds. However, if it took 600 foot-pounds of energy to lift the weight, the pulley system's efficiency would be calculated as follows: 500/600 = 0.83 or 83 percent.

The efficiency of a machine is always less than one, in general. It is defined as the ratio of output energy to input energy. Because of losses due to friction and other variables, the output energy is always less than the input energy. As a result, the efficiency of a machine is always less than one.Answer: False.

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The cyclist's foot exerts an average force of 62.5 N on the pedals while traveling at 8.0 m/s.

The formula for power, which is \(Power = \frac{ Work}{Time}\). In this case, the cyclist is doing work at the rate of 500 W, so we can rearrange the formula to solve for work: Work = Power x Time.
To find the time, we can use the formula for velocity, which is\(Velocity =\frac{Distance}{Time}\). Rearranging this formula gives us \(Time =\frac{Distance}{Velocity}\).
Assuming the cyclist is traveling at a constant velocity, we can use this formula to find the time it takes for her to cover a distance of 1 meter (since we are trying to find the force per meter of travel).

\(Time = \frac{1 meter}{8.0 m/s }\)

= 0.125 seconds.
Now we can plug in the values we have into the formula for work:

Work = 500 W x 0.125 s

= 62.5 J.
The average force can be found by using the formula for force, which is \(Force =\frac{ Work}{Distance}\). In this case, we want to find the force per meter of travel, so we can use Distance = 1 meter.

Thus, Force = 62.5 J / 1 meter

= 62.5 N.
The cyclist's foot exerts an average force of 62.5 N on the pedals while traveling at 8.0 m/s.

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Explanation:

using Charles law; since the pressure is constant

V1/T1 = V2/T2

5/300 = V2/350

cross multiply

V2 X 300 = 5 X 350

V2 = 1750/300

V2 = 5.833L

The inclination of a system refers to the angle between the plane of the system and the plane of the sky as seen from Earth. A system with greater amplitude will have larger variations in brightness and thus will be easier to observe.

The amplitude of a system depends on the geometry of the system and the angle at which it is viewed. For example, a system viewed edge-on (i.e. with an inclination of 90°) will have a larger amplitude than a system viewed face-on (i.e. with an inclination of 0°), because the edge-on view will show more of the system's structure and produce larger variations in brightness.

Therefore, if we assume that systems with greater amplitude are easier to observe, we would be more likely to observe a system with an inclination near 90° than one with an inclination near 0°. This is because an edge-on view would produce larger variations in brightness, making the system easier to detect and study. However, it is important to note that the inclination angle is just one factor affecting the detectability of a system, and other factors such as distance, size, and brightness also play a role.

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Answer:

Concave mirror

Explanation:

Because as we move the object far away from the mirror, the image gets inverted.

Answer:

Concave mirror

Explanation:

The maximum height reached by the projectile is approximately 283.13 meters.

To determine the velocity of the projectile 2 seconds after firing, we need to break down the initial velocity into its horizontal and vertical components.

The horizontal component remains constant throughout the motion, so it will be the same as the initial velocity: 150 m/s.

For the vertical component, we can use the equation v = u + at, where v is the final velocity, u is the initial vertical velocity component, a is the acceleration due to gravity (-9.8 m/s^2), and t is the time.

Since the projectile is fired upwards, the initial vertical velocity component is given by u = u_initial * sin(angle), where u_initial is the initial velocity (150 m/s) and the angle is 47 degrees.

Using this information, we can calculate the vertical velocity component at t = 2 seconds:

v = u + at

v = (u_initial * sin(angle)) + (a * t)

v = (150 * sin(47)) + (-9.8 * 2)

v ≈ 76.65 - 19.6

v ≈ 57.05 m/s

So, the velocity of the projectile 2 seconds after firing is approximately 57.05 m/s.

To determine the total time in the air, we need to find when the projectile returns to the same height from which it was launched. The total time in the air can be calculated using the equation t = (v_final - u_initial * sin(angle)) / (-a), where v_final is the final vertical velocity component (0 m/s).

0 = (u_initial * sin(angle)) + (-9.8 * t_total)

t_total = (u_initial * sin(angle)) / 9.8

Using the given values, the total time in the air is approximately:

t_total = (150 * sin(47)) / 9.8

t_total ≈ 6.42 seconds

So, the total time in the air is approximately 6.42 seconds.

To determine the maximum height reached by the projectile, we can use the equation h_max = (u_initial^2 * sin^2(angle)) / (2 * a), where h_max is the maximum height.

h_max = (150^2 * sin^2(47)) / (2 * 9.8)

h_max ≈ 283.13 meters

Therefore, the maximum height reached by the projectile is approximately 283.13 meters.

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The force that the larger block (m) is exerting on the smaller block is 4 N.

Force is a push or pulls upon an item because of the object's interaction with some other object. pressure is a power that can exchange the motion of an object. A force can reason an object with mass to alternate its speed, i.e., to boost up. pressure also can be described intuitively as a push or a pull. A force has each significance and course, making it a vector amount.

Calculation:-

mass = 3 kg

force applied = 12 N

a = 12/3

  4 m/s²

mass of a smaller object = 1 kg

F = ma

 = 1 * 4

 4 N

The phrase 'Force' has a unique meaning. At this degree, it is absolutely appropriate to describe a force as a push or a pull. A force is not something that an object consists of or 'has in it. A force is exerted on one object through another. The concept of a force isn't always restricted to living matters or non-living matters.

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Answer:

Scientists are developing techniques to detect signatures from space in their search for alien life.

The Very Large Array (VLA) telescope, at the National Radio Astronomy Observatory (NARO) site in Socorro, New Mexico, will be used to constantly seek evidence of technosignatures.

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In series connection the current flow remains constant

The magnetic field strength inside a current-carrying coil is determined by the amount of current flowing through the coil and the number of turns in the coil, as well as the permeability of the material inside the coil.

In the given options, a vacuum has the highest permeability, so the magnetic field strength inside a current-carrying coil will be greater if the coil encloses a vacuum. Therefore, the correct answer is (E) vacuum.

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Answer:

Explanation:

Half life  = 5.6

no of half life in 15.78 years = 15.78 / 5.26

= 3 .

\(N = N_0(\frac{1}{2})^n\)

N₀ is original mass , N is mass after n number of half lives.

Inserting the given data in the equation above

\(50 = N_0(\frac{1}{2})^3\)

N₀ = 50 x 2³

= 400 gm .

original sample will contain 400 gms of sample.

The particle will have an energy of 12U0. A particle travels at an initial velocity from point B to point A, gaining U0 joules of kinetic energy along the way. The constant force at this point is equal to 12F.

The acceleration which gravity gives to objects falling freely serves as a gauge of its strength. The gravity's acceleration at Earth's surface is approximately 9.8 meters (32 feet) per second every second.

The following are a few instances of the power of gravity: the energy holding the gases inside the sun. the power behind a ball's descent after being thrown into the air. the force that makes an automobile coast down even when the gas is not depressed.

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6. Corporation - E. A business organization legally distinct from its owners, treated as if it were an individual.

Business is an economic activity involving the exchange of goods and services for money or other goods and services. It involves the production, distribution and sale of goods and services to customers. Businesses can be located in physical stores or online.

7. Stock - A. A portion of ownership of a firm.
8. Share - G. Represents ownership of a firm.
9. Dividend - C. Profit paid to a shareholder.
10. Common Stock - D. Stock that provides shareholders a voice in how the company is run and a share in the profits.
11. Preferred Stock - B. Provides guaranteed dividends but no voice in running a corporation.
12. Corporate Bond - I. Certificate issued by a corporation in exchange for money borrowed from an investor.
13. Principal - F. The actual amount of money borrowed.
14. Interest - H. Predetermined amount of money a borrower must pay for the use of borrowed funds.

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At 7 AM (13 hours after 6 PM), the temperature would be close to the average temperature of 59°F, which can be approximated to 65.9°F.

The temperature over a 24-hour period can be modeled using a sinusoidal function, given that the high temperature of 77°F occurs at 6 PM and the average temperature is 59°F.

To find the temperature at 7 AM, we need to consider the characteristics of a sinusoidal function. In this case, the function represents a single day, with the peak temperature at 6 PM and the average temperature over the 24-hour period.

Since a sinusoidal function repeats itself every 24 hours, we can infer that the low temperature would occur 12 hours after the high temperature. Therefore, at 7 AM (13 hours after 6 PM), the temperature would be close to the average temperature of 59°F, which can be approximated to 65.9°F.

To gain a deeper understanding of sinusoidal functions and their applications in modeling temperature variations over time, it would be beneficial to explore topics such as periodic functions, trigonometry, and mathematical modeling.

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Answer:

The answer is thallium.

Explanation:

Answer:

classifying: are made by using the 5 senses.  Good observations are essential in learning the other science process skills.

Examples:

The learner will be blind folded and make observations using the sense of touch.  

The learner will create  observations about a coin using the 5 senses.

The learner will mix primary colors to create more colors.

answer

2. Classifying: making observations is important to notice similarities, differences with the garden vegetables

inferring: use your information that u already know

measuring:The learner will find the mass of different liquids that have the same volume

communication:It is important to be able to share your information.  This can be done with graphs, diagrams, maps, and spoken word

Explanation:

can u mark as brainliest pls

Answer:

Determine the total capacitance between points A and B in the figure below. C =104F C = 5uF C=20uF MAE ce Select the best answer: 2.84uF 2.80uF O 2.90pF 2.86F

Explanation:

hoped it help cutie if u need more help js ask meh

Answer:

\(10 \: m.\)

Explanation:

\(his \: position \:is \: his \: distance \: from \: the \: \\ point \: of \: motion \: and \: is \: given \: by : \\ v = \frac{s}{t} \\ s = vt =2 \times 5 \\ s = 10 \: m.\)

The change in specific internal energy of the working fluid is 220 kJ/kg.

The internal energy calculated in (i) is a loss. The total internal energy of the working fluid is 1100 kJ. The heat flow to the cylinder is 320 kJ/kg.

(i) The change in specific internal energy (Δu) is calculated by subtracting the initial specific internal energy (u1) from the final specific internal energy (u2). Thus, Δu = u2 - u1 = 200 kJ/kg - 420 kJ/kg = -220 kJ/kg. The negative sign indicates a decrease in internal energy.

(ii) Since the change in specific internal energy (Δu) calculated in (i) is negative, it means that the internal energy of the working fluid has decreased during the expansion process. Therefore, it is a loss of internal energy.

(iii) The total internal energy (U) of the working fluid can be determined by multiplying the mass of the working fluid (m) by the specific internal energy (u). Therefore, U = m * u = 5 kg * 200 kJ/kg = 1000 kJ.

(iv) The work done by the air during expansion is given as 100 kJ/kg. According to the first law of thermodynamics, the work done (W) is equal to the heat flow (Q) plus the change in internal energy (ΔU) of the system. Thus, W = Q + ΔU. Rearranging the equation, Q = W - ΔU = 100 kJ/kg - (-220 kJ/kg) = 320 kJ/kg. Therefore, the heat flow to the cylinder is 320 kJ/kg.

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What's the relationship

\(\\ \rm\Rrightarrow T=2\pi \sqrt{\dfrac{l}{g}}\)

\(\\ \rm\Rrightarrow T^2g=4\pi ^2\ell\)

\(\\ \rm\Rrightarrow\ell=\dfrac{T^2g}{4\pi^2}\)

4A can be correct

The correct option is: 2A cm

In a simple harmonic motion, the particle moves back and forth around a mean position. The distance covered by the particle in one time period depends on the amplitude of the oscillation.

The time period (T) of a simple harmonic motion can be expressed in terms of the frequency (f) as:

T = 1/f

The frequency (f) of a simple harmonic motion can be related to the angular frequency (ω) as:

ω = 2πf

Therefore, the time period (T) can also be expressed in terms of the angular frequency (ω) as:

T = 2π/ω

The displacement of the particle at any time (t) during the simple harmonic motion can be expressed as:

x = A cos(ωt)

where x is the displacement, A is the amplitude, and cos(ωt) is the cosine function.

The particle moves from its initial position to its maximum displacement (+A), then back to its initial position, and finally to its maximum displacement in the opposite direction (-A), before returning to its initial position again. Therefore, the distance covered by the particle in one time period is twice the amplitude (2A).

Therefore, the correct option is:

2A cm

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The two thermometers on a sling psychrometer yielding the same temperature after the proper wet bulb measuring procedure indicates that the relative humidity is 100%, meaning the air is saturated with moisture and cannot hold any more.

A sling psychrometer is a device used to measure relative humidity.

It consists of two thermometers, one of which is a wet bulb thermometer that is covered with a wet wick. As the moisture on the wick evaporates, it cools down the thermometer.

The other thermometer is a dry bulb thermometer that is not covered with any wet material.

The two thermometers are then swung around in the air using a handle, allowing the evaporative cooling to take effect.
When the two thermometers on the sling psychrometer yield the same temperature, it indicates that the air is saturated with moisture and the relative humidity is 100%.

This means that the air cannot hold any more moisture, so any additional moisture will condense into visible water droplets.

Summary: The two thermometers on a sling psychrometer yielding the same temperature after the proper wet bulb measuring procedure indicates that the relative humidity is 100%, meaning the air is saturated with moisture and cannot hold any more.

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Given:

The applied force is,

The mass of the object is,

The constant velocity of the object is,

To find:

The coefficient of friction between the object and the surface

Explanation:

The object is moving with a constant velocity which means the object is under equilibrium. So, the applied force is equal to the frictional force on the object.

If the coefficient of friction between the object and the surface is

we can write the frictional force as,

For equilibrium condition,

Hence, the coefficient of friction between the object and the surface is 0.47.

The results of young's double-slit experiment were

- Waves produced a diffraction pattern.

- Results supported the wave theory of light.

- Results supported the particle theory of light

Two coherent sources of light are employed in Young's double-slit experiment, which is often conducted at a distance that is only a few times greater than the wavelength of the light used. Young's double-slit experiment contributed to our knowledge of the diagrammed wave theory of light.

The act of bending of the light around edges such that it expands out and illuminates regions, where a shadow is anticipated, is known as the diffraction of light. In general, since both occur simultaneously, it is challenging to distinguish between diffraction and interference.

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Answer: A,B,E.

Explanation: doing the quiz on edge!

stay the same -Gravitational force relies only upon distance and the masses - not their sizes. A shorter Earth (of the same mass) would not exert a different force on the Moon.

The gravitational force exists as a force that attracts any two objects with mass. We reach the gravitational force attractive because it always attempts to pull masses together, it never makes them apart. In fact, every object, including you, lives pulling on every other object in the whole universe!

The gravitational force on Earth stands equivalent to the force the Earth exerts on you. At rest, on or around the surface of the Earth, the gravitational force equals your weight.

stay the same -Gravitational force relies only upon distance and the masses - not their sizes. A shorter Earth (of the same mass) would not exert a different force on the Moon.

Hence, Option  A. staying the same is correct.

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Answer:

7 m/s

Explanation:

Find the total mass

m1+m2 = total mass

700kg+300kg = 1000kg

Find the velocity of each mass

v1 = 10m/s

v2 = 0m/s

Find the combined momentum

m1v1 + m2v2 = mfvf

(700)(10)+(300)(0)=(1000)(vf)

7000=1000(vf)

7=vf

So the velocity of the two cars rolling together is 7 m/s