If a hypothesis is.......
additional tests should be done to ensure accurate results.
a. correct
b.incorrect
c. unknown
d. inconclusive

Silver is the best conductor of heat and will require the least amount of energy to heat it by 1⁰C.

The specific heat capacity of an object is the quantity of heat require to raise a unit mass of the substance by 1 kelvin.

The specific heat of the given substances;

Water = 4186 J/kg⁰C

Copper = 385 J/kg⁰C

Concrete = 850 J/kg⁰C

Iron = 450 J/kg⁰C

Silver = 233 J/kg⁰C

Air = 1005 J/kg⁰C

The material that will require the least energy to heat it by 1 ⁰C is a material with the highest thermal conductivity and least specific heat capacity.

Thus, silver is the best conductor of heat and will require the least amount of energy to heat it by 1⁰C.

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Answer:

\(\huge\boxed{\sf I = 50,000\ Ns}\)

Explanation:

Force = F = 100,000 N

Time = t = 0.5 s

Impulse = I = ?

I = F × t

I = 100,000 × 0.5

I = 50,000 Ns

\(\rule[225]{225}{2}\)

As magnification increases, the field of view becomes smaller due to the way optical systems work.

The field of view refers to the extent of the observable area when looking through a magnifying optical system, such as a microscope or a telescope.

When the magnification is increased, the size of the image being viewed is enlarged, but the physical size of the object being observed remains the same.

As a result, the increased magnification causes the image to fill a larger portion of the observer's visual field, reducing the overall area that can be seen within the field of view.

This reduction in the field of view occurs because optical systems have a limited capacity to capture and display information. As magnification increases, the system focuses more on a specific region of interest, sacrificing the peripheral areas.

The optics of the system are designed to magnify the central portion of the image, which leads to a narrower field of view. This is analogous to zooming in on a photograph—while details become clearer, the visible area becomes smaller.

In summary, increasing magnification reduces the field of view because the focus is concentrated on a smaller region of interest within the overall observable area.

This trade-off between magnification and field of view is a fundamental characteristic of optical systems and is taken into account when choosing the appropriate magnification for a given application.

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Answer:

\(Q=-38.15kJ\)

Explanation:

From the question we are told that

Piston-cylinder initial Volume of air \(v_1=0.1 m^3\)

Piston-cylinder initial temperature \(T_1=400k\)

Piston-cylinder initial pressure \(P_1= 100kpa\)

Supply line temperature\(T_s=400k\)

Supply line pressure \(P_s= 500kpa\)

Valve  final pressure \(P_v=500kpa\)

Piston movement pressure \(P_m=200kpa\)

Piston-cylinder final Volume of air\(v_2=0.2 m^3\)

Piston-cylinder final temperature \(T_2=440k\)

Piston-cylinder final pressure \(P_2= 500kpa\)

Generally the  equation for conservation of mass is mathematically given by

\(Q=m_2 \mu_2-m_1 \mu_1 +W-(m_2-m_1)h\)

where

Initial moment

\(m_1=\frac{p_1 V_1}{RT_1}\)

\(m_1=\frac{100*0.1}{0.287*400}\)

\(m_1=8.7*10^-^2kg\)

Final moment

\(m_2=\frac{p_2 V_2}{RT_2}\)

\(m_1=\frac{500*0.3}{0.287*440}\)

\(m_1=79*10^{-2}kg\)

Work done by Piston movement pressure

\(W=Pd\)

\(W=P(v_2-v_1)\)

\(W=200(0.2-0.1))\)

\(W=20000J\)

Heat function

\(h=cT_1\)

\(h=1.005(400)\)

\(h=402\)

Therefore

\(Q=(0.792*0.718(440)-0.0871*0.718(400)+20-(0.792-0.087)*402))\)

\(Q=-38.15kJ\)

It is given mathematically that the system lost  or dissipated Heat of

\(Q=-38.15kJ\)

The kangaroo's horizontal speed will be 9.7 m/s and its departure speed will indeed be 10.65 m/s.

By observing the pace at which this compressed region moves through the medium, we may determine the sound speed. The sound wave travels at a speed of around 343 meters per second in low humidity at 20 degrees Celsius.

The following equation relates the distance to the direction and initial velocity:

d = [v₀²sin2θ]/g, where θ – the angle of the jump.

Thus, v₀² = gd / (sin2θ) = (9.8×8)/0.69 = 113.62

v₀ = 10.65 m/s ( the take off speed).

The horizontal velocity equals:

vₓ = v₀cos 22° = 10.65 m/s × 0.92 = 9.7 m/s

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Answer:

A. vitamin B

Explanation:

The probability density function of X is plotted for a=1/2 and a=2.

The expected value of X (E[X]) is determined.

The expected value of 1/X (E[1/X]) is determined.

The variance of X (V[X]) is determined.

The median of X is determined.

When a=1/2, the probability density function of X is given by p(X=x∣a)=((1/2)+1)x(1/2)^0=(3/2)x for x∈[0,1]. When a=2, the probability density function becomes p(X=x∣a)=(2+1)x^2=3x^2 for x∈[0,1]. To plot the probability density function, we can assign different values of x within the range [0,1], calculate the corresponding probabilities using the given formulas, and plot the points on a graph.

The expected value of X (E[X]) is calculated by integrating the product of X and its probability density function over the range [0,1]. For a=1/2, E[X] = ∫(x * (3/2)x) dx from 0 to 1. For a=2, E[X] = ∫(x * 3x^2) dx from 0 to 1. By evaluating these integrals, we can determine the expected values.

The expected value of 1/X (E[1/X]) is calculated similarly to E[X], but instead of integrating X, we integrate 1/X using the respective probability density functions for different values of a.

The variance of X (V[X]) can be computed by taking the second moment of X (E[X^2]) minus the square of the first moment (E[X]) squared. V[X] = E[X^2] - (E[X])^2. By calculating E[X^2] using the probability density function and the expected values obtained in step 2, we can determine the variances for different values of a.

The median of X is the value of X such that the cumulative distribution function (CDF) is equal to 0.5. To find the median, we integrate the probability density function from 0 to the median value and set it equal to 0.5. Solving for the median provides its value in terms of the parameter a.

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The average solar power requirement for the United States, considering solar power and energy consumption, is approximately 6.35 * 10¹⁰ Watts.

To calculate the average solar power requirement for the United States in watts, given the total annual U.S. energy consumption of 2 * 10²⁰ Joules, you can follow these steps:

So, the average solar power requirement for the United States, is approximately 6.35 * 10¹⁰ Watts.

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Answer:

Argon is the third most abundant gas in our atmosphere, making up about one percent in terms of moles of gas.

Explanation:

Roughly, our atmosphere is 78% nitrogen, 21% oxygen, 1% argon, and trace amounts of many other gases plus variable amounts of water vapor.

The kinetic energy of the crate as it reaches the lower surface is 80 J

Kinetic energy is the energy possed by an object in motion. Mathematically, the kinetic energy can be expressed as follow:

KE = ½mv²

With the above formula, the kinetic energy of the crate can be obtained as follow:

KE = ½mv²

KE = ½ × 10 × 4²

KE = 5 × 16

KE = 80 J

Therefore, the kinetic energy of the crate is 80 J

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By definition, Newton's First Law, also called the Law of inertia, indicates that "Every body perseveres in its state of rest or of uniform rectilinear motion unless it is forced to change its state by forces impressed on it."

This means that for a body to come out of its state of rest or of uniform rectilinear motion, it is necessary for a force to act on it.

So, in other words, all bodies are opposed to changing their state of rest or motion and this opposition is called inertia.

In this way, a body is in equilibrium when the resultant of the forces acting on it is zero. That is, it is not possible for a body to change its initial state (be it rest or motion) unless one or more forces intervene.

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Answer:

If the mass and volume of an object can be measured, then its density can be determined because density equals mass over volume.

Explanation:

The radius of the circle in which the plane is flying is 1887 m.

The aerodynamic lift is the force that keeps the aircraft flying in the air.

Let the  aerodynamic lift be F1 sinθ= mv^2/R ---- (1)

and F1 cosθ= mg --------- (2)

Equating (1) and (2) and eliminating the mass;

R = v^2/ g tanθ

Where v = 490 km/h or 136 m/s

R = (136)^2/9.8 * tan 45

R = 18496/ 9.8

R = 1887 m

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Answer:

Sphere is a geometrical object in dimensional space  that surface of a circle and ball.

Explanation:

Sphere is that the circular objects in the two dimensional space (1) circle

(2) disk. Two dimensional space is a set of points and the distance of that point,The two points of Sphere that length and center.

Sphere can constructed as the named of surface form circle about  any diameter. circle is the special type of the revolution replacing the circle,

sphere is the distance r is the radius of the ball and circle  is the center of mathematical ball,as the center and the radius of the sphere is to respectively.

The ball and sphere has not be maintained mathematical references  as a solid references. A sphere of any radius is centered at the number of zero.

The force winds up unchanged, at 100 N.

The angle that the laser beam can make with the vertical is 41.805°.

When a light beam travelling through a medium with a higher refractive index approaches a second medium at an angle of incidence larger than the critical angle, a total internal reflection occurs at the border between the two transparent media.

Total internal reflection occurs at an angle of 90 degrees above the threshold final angle.

Now considering the boundary between the air and the plastic,  

Applying Snell's law,

n(plastic) sinθ' = n(air) sinθ

sinθ' = n(air) sinθ/n(plastic)

sinθ' = (1/1.5) x sin90

sinθ' = 2/3

Therefore, the angle that the laser beam can make with the vertical,

θ' = sin⁻¹(2/3)

θ' = 41.805°

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The image taken by a telescope of the three stars will be backwards. This is because the light from the stars is bent by the lenses in the telescope, and the image is projected upside down and reversed.

The same is true for any object that is viewed through a telescope.

If you look through a telescope backwards, the image will be right-side up, but it will still be inverted. This is because the lenses in the telescope are still bending the light, but the image is being projected onto the back of the eyepiece instead of the front.

There are some telescopes that have special eyepieces that can be used to correct the inversion of the image, but these are not typically used for astronomical observations.

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Answer:

Asteroid y

Explanation:

Answer:

Computer hard drives use magnetism to store the data on a rotating disk. More complex applications include: televisions, radios, microwave ovens, telephone systems, and computers. An industrial application of magnetic force is an electromagnetic crane that is used for lifting metal objects.

Answer:

Examples of magnetic force is a compass, a motor, the magnets that hold stuff on the refrigerator, train tracks, and new roller coasters. All moving charges give rise to a magnetic field and the charges that move through its regions, experience a force.

I Hope this will help you if not then sorry :)

Answer: B

Explanation: it is perpendicular to a surface

Answer:

it is perpendicular to a surface

Explanation:

Answer:

The half-life of a radioactive isotope is the time such that the initial amount of the isotope is reduced to its half.

Thus, if we start with A grams of a given radioactive isotope, after a 1 half-life, we will have A/2 grams of the radioactive isotope.

In this case, we know that the sample has 110g of a radioactive isotope.

Then, after 1 half-life, we should have half of 110g, which is:

110g/2 = 55g

Then we should have 55 g of a radioactive isotope.

The answer that is closer to this result is option d (50 g), so that is the correct one.

The chemical process which requires energy is breaking bond in KOH and HBr. Hence, option C is correct.

The capacity to perform work is known as energy in physics. Potential, kinematic, thermodynamic, electromagnetic, chemical, nuclear, and other types are all possible.

As energy is transferred through one body to another, there is also heat and work. As a result, heat transfer may result in thermal energy, whereas labor done may result in mechanical power.

As per the given reaction in the question,

KOH + HBr - KBr + H20

Here, in this reaction the chemical process which requires the energy is at the time of breaking of bonds in KOH and HBr at that time the energy is required.

Therefore, it is concluded that breaking bonds in KOH and HBr i.e., option C is correct.

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For incoming microwaves with a wavelength of approximately: 21.4 cm, the corners of the wall opposite the window will correspond to the first-order minima.

We need to find the wavelength of incoming microwaves that will cause the corners of the wall opposite the window to correspond to first-order minima, given the window width is 30.3 cm and the room is square.

To solve this, we can use the formula for single-slit diffraction:
sin(θ) = (mλ) / a
where θ is the angle of diffraction,
m is the order of the minima (in this case, m = 1 for the first-order minima),
λ is the wavelength of the incoming microwaves, and
a is the width of the window.

Since the room is square, we know that the angle θ is 45 degrees (half of 90 degrees). We can now solve for the wavelength λ:
sin(45°) = (1 * λ) / 30.3 cm

To find λ, we can rearrange the formula:
λ = 30.3 cm * sin(45°)

Now, we can calculate the wavelength:
λ ≈ 30.3 cm * 0.7071 (since sin(45°) ≈ 0.7071)
λ ≈ 21.4 cm

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Answer:

How many ampere in 1 milliampere? The answer is 0.001.

We assume you are converting between ampere and milliampere.

You can view more details on each measurement unit:

ampere or milliampere

The SI base unit for electric current is the ampere.

1 ampere is equal to 1 ampere, or 1000 milliampere.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between amperes and milliamperes.

Type in your own numbers in the form to convert the units

Explanation:

Hope this helped :)

EAC( Low-energy lightbulb )=18.47 EAC( Conventional lightbulb )=7.33 Conventional lightbulb is cheaper to operate. Option D

To calculate the Equivalent Annual Costs (EAC), we need to consider the initial cost, maintenance costs, and the present value of future costs, taking into account the discount rate.

The EAC (Equivalent Annual Cost) is calculated by summing up the annual costs of the lightbulb over its lifetime, discounted at the real discount rate of 4%.

For the low-energy lightbulb:

EAC = Cost of bulb + Present value of annual electricity cost

= $3.60 + ($2.00 / (1 + 0.04)^1) + ($2.00 / (1 + 0.04)^2) + ... + ($2.00 / (1 + 0.04)^9)

≈ $18.47

For the conventional lightbulb:

EAC = Cost of bulb + Present value of annual electricity cost

= $0.60 + ($7.00 / (1 + 0.04)^1) + ($7.00 / (1 + 0.04)^2) + ... + ($7.00 / (1 + 0.04)^1)

≈ $7.33

Since the EAC for the low-energy lightbulb is $18.47 per year and the EAC for the conventional lightbulb is $7.33 per year, the conventional lightbulb is cheaper to operate assuming a burnt-out bulb is replaced by an identical bulb.

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l=500m

speed=70m/s

t=?

t=500/70=7.14s

Explanation:

The distance traveled north ward  = 2 miles

       distance traveled south ward  = 3miles

 Displacement is the distance traveled in a specific direction. So, it depend on the start and finish point.

       The displacement  = 3 miles  - 2miles  = 1mile southward

Distance is the total length of path;

        Distance  = 3 miles + 2 miles = 5miles

Answer:

The correct option is the last option.

Explanation:

Generally, when trying to create a mechanical advantage of a lever for an apparatus or a machine, the load is usually moved closer to the fulcrum. Hence, if a lever has a total length of 12 meters and the fulcrum is placed at 6 meters (the center), the best way (based on the previous statement) to double the mechanical advantage of the lever is to move the fulcrum 4 meters toward the side on which the force is applied. The correct option is the last option.

Answer: the answer  is  not  d  idk wat it is sorry but its not d