A man makes a ruler with graduation in cm i.e 100 divisions in 1m on it. To what accuracy can this ruler measure? how can this accuracy be increased?​

Space telescopes must be placed in orbit around earth in order to observe short-wavelength radiation.

A telescope is an optical instrument that uses lenses, curved mirrors, or a combination of both to watch distant objects.

When atoms in a gas reach this temperature, they travel so quickly that when they collide, they release X-ray photons with wavelengths smaller than 10 nanometers.

Because the Earth's atmosphere prevents all X-rays from space, these wavelengths must be seen using space telescopes.

To study short-wavelength radiation, space telescopes must be put in orbit around the Earth.

Hence, space telescope is the correct answer.

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Answer:

b) a compound which produces ions dissolved in a solution that conduct electricity.

NaCl is an electrolyte.

Answer:

wrapping around the wire around iron core several times

Explanation:

adding more turns to the coil. increasing the current flowing through the coil.

The option that can be expressed in light years is " the distance between two stars." The correct option is B.

A light-year is a unit of distance used to measure astronomical distances. It is defined as the distance that light travels in one Earth year in the vacuum of space, which is approximately 9.46 trillion kilometers (5.88 trillion miles). Light travels at a speed of about 299,792,458 meters per second (or approximately 186,282 miles per second), which means that in one year, light can cover a distance of 9.46 trillion kilometers. Light years are commonly used to measure the distance between stars and galaxies, and since space is vast, other units of distance are often not practical.

Here in the Question,

A] The age of a rock is a measure of time, usually in millions or billions of years, and cannot be expressed in light years, which is a unit of distance.

C] The speed at which the Earth revolves around the sun is measured in kilometers per second or miles per hour and represents a velocity, not a distance. Hence it cannot be expressed in light years.

D] The time it takes for Earth to complete a revolution around the sun is measured in days or years and is again a measure of time, not distance. So it cannot be expressed in light years.

Therefore, Only B The distance between two stars is a measure of distance, which can be expressed in light years since it is a vast distance and other units may not be suitable.

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Answer:

200ft

Explanation:

To find out how much distance the man covered, you need to find the perimeter of the rectangle. To find the perimeter of a rectangle, the formula is:

P = (L + H) × 2

Step 1

Plug in the values for L and H.

P = (70 + 30) × 2

Step 2

Add 70 and 30, because you need to add parentheses first.

P = (100) × 2

Step 3

Remove parentheses, and multiply 100 by 2.

P = 100 × 2

P = 200

Thus, the man walked 200 feet in distance.

The kinetic energy will be equal to the potential energy at top

m is mass

h is height

The product label which Mateo should place in the marked cell is that it: B. provides electrical energy.

A product label can be defined as a paper-document with specific information about the chemical elements, nutrients, and other chemical compounds that are present in a product and its general use or function.

In this scenario, the product label which Mateo should place in the marked cell shown in the image attached below is that, this product was designed and developed to provide electrical energy, based on the electrical symbol for battery.

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Answer:

Ampere

Explanation:

The SI unit of electric current is Ampere (A) after French physicist Andre Ampere who discovered electrical current

Answer:

C) colors

Explanation:

The wavelengths of light determine the color that we see. Humans cannot see lightwave absorption, but we can see light in the form of colors.

Shorter wavelengths (indicating higher frequencies) look violet,

and Longer wavelengths (indicating lower frequencies) look more red

Answer:

84 joules

Explanation:

potential energy = mgh

5.24×1.63×9.8

= 84 joules

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Velocity is defined as total displacement occurrence by the given time interval, and since it's a Vector quantity it has direction as well.

So, the correct choice will be ~ B. 125 m/ East

Because it has unit of Velocity ( that is - m/s ) and it shows direction of displacement ( that is - East )

The initial acceleration of proton and electron is 3.45 x 10¹⁸ m/s² and 6.33 x 10²¹ respectively.

The electrostatic force F between two charged objects placed distance apart is directly proportional to the product of the magnitude of charges and inversely proportional to the square of the distance between them.

F = kq₁q₂/r²

where k = 9 x 10⁹ N.m²/C²

Given is the charge on proton and electron  is q =1.6 x 10⁻¹⁹ C, distance r =2 x 10⁻¹⁰m , then the force will be

F = k q²/r²                          

Substituting the above values in the formula, we get the electrostatic force,

F = (9 x 10⁹) (1.6 x 10⁻¹⁹)²/(2 x 10⁻¹⁰)²    

F = 5.76 x 10⁻⁹ N

The acceleration of electron when both proton and electron released is

acceleration =  electrostatic force / mass of electron

Putting the values, we have initial acceleration of electron

a = (5.76 x 10⁻⁹)/(9.1 x 10⁻³¹)

a = 6.33 x 10²¹ m/s²

The acceleration of proton is due to the electrostatic force of attraction between proton and electron is given by

acceleration =  electrostatic force / mass of proton

inserting the values, we get the initial acceleration

a '= (5.76 x 10⁻⁹)/( 1.67 x 10⁻²⁷)

a'= 3.45 x 10¹⁸ m/s²

Thus, initial acceleration of proton and electron is 3.45 x 10¹⁸ m/s² and 6.33 x 10²¹ respectively.

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Weather

Explanation:

As during climate only one season change to another and it's a long period of time

while in weather it's can change into any season for few days depending on the relief of the area.

Answer:

weather

Explanation:

There is often confusion between weather and climate. Weather is the condition of the atmosphere at a particular place over a short period of time.

Answer:

  170 N

Explanation:

Impulse is the change in momentum. Momentum is the product of mass and velocity. These are related to applied force by ...

  F·Δt = m·Δv

__

Here, the velocity goes from 0 to 34 m/s in 0.0116 s. The mass is 0.058 kg. Filling in the given values, we have ...

  F(0.0116 s) = (0.058 kg)(34 m/s)

  F = 0.058×34/0.0116 kg·m/s² ≈ 170 N

The required force is 170 newtons.

Answer:

Taking forces along the plane

F cos θ - M g sin θ -100 = M a       net of forces along the plane

F = (M a + M g * .5 + 100) / .866     solving for F

F = (80 * 1.5 + 80 * 9.8 * .5 + 100) / .866 = 707 N

F = 707 N acting along the plane

Fn = F sin θ + M g cos θ       forces acting perpendicular to plane

Fn = 707 * 1/2 + 80 * 9.8 * .866 = 1030 Newtons   forces normal to plane

(this would give a coefficient of friction of 100 / 1030 = .097 = Fn)

[tex]~~~~F=ma\\\\\implies m = \dfrac{F}a = \dfrac{200~ N}{10~ ms^{-2}} = 20~ \text{kg}\\\\\text{The mass of the object is 20 kg.}[/tex]

When charging a fully depleted battery with a 220/240-volt charging dock, Nissan LEAF can be fully charged in about 7.5h.

It converts the electro chemical energy to the electrical energy when connected across the two ends of the conductor.

The Nissan LEAF comprises of a standard 120-V charging cable.  In order to charge it fully, we need a 220/240Volts battery. The time take take n to fully charge is 7.5 hours.

Thus, when charging a fully depleted battery with a 220/240-volt charging dock, Nissan LEAF can be fully charged in about 7.5 h.

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Answer:

A) .27 A

Explanation:

v = ir

i = v/r

equivalent r  =   45 * 90 / (45+90) = 30 ohms    ( for the two r in parallel)

i = 8v / 30 ohm = 267 mAmps

Balanced forces are forces that do not result to change in motion while unbalanced forces are forces that result to change in motion.

Force is defined as the product of mass and acceleration of an object. That is Force = mass × acceleration.

Balanced force is a type of force that do not result to change because the forces are equal in size and opposite.

Unbalanced force is a type of force that result to change because forces on the opposite sides are not equal.

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When plug fuses are used on all new installations such as in a disconnect switch for a clothes dryer, the fuses must be type S.

Type S fuses are also called tamper proof fuses because each fuse size has a different base and thread size.

These fuses also require the use of a special adapter which is screwed into the standard Edison base of the fuse holder.

Thus, when plug fuses are used on all new installations such as in a disconnect switch for a clothes dryer, the fuses must be type S.

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Tardigrades related to astronomy as they can survive in extreme, harsh environments, including space for long time without oxygen.  The correct option is A , B and C.

A special adaptation that allows the tiny animal known as the tardigrade to curl up into a dry, lifeless ball and survive for decades.

Tardigrades can undergo utter vacuum and intense pressures more than five times as in the deepest ocean. Temperatures up to 300F and as low as -458F is maintained.

They survive in space and for long time for about 10 days. They can live without water for decades.

Thus, the correct option is A , B and C.

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Answer:

White light contains yellow, green, and blue - only the blue light will be reflected giving the blue color.

So the green and yellow light thru the filter will not be reflected and the fabric will still appear blue.

blue is correct

Answer:

3.6 s

Explanation:

100 km/hr =27.77 m/s

100/27.77=3.6 sec

Answer:

Explanation:

I'm assuming you need this answer quickly.

Using what we know:

The energy of a single 400 nm photon is 3.1 eV.

So a photon of 412 nm wavelength would have the energy of 4.0 ev.

answer:

The ball rolling without slipping will make it furthest up the ramp because it has greater kinetic energy.

The height rolled by each object can be determined by applying the principle of conservation of energy.

The ball rolling without slipping will have additional rotational kinetic energy.

The block won't have additional rotational kinetic energy.

Total K.E ball > Total K.K block

ΔP.E = ΔK.E

Thus, the ball rolling without slipping will make it furthest up the ramp because it has greater kinetic energy.

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The work done in moving the sled 35 feet when force is aligned from the horizontal is 1583.9 lb.ft

Work done is equal to product of force applied and distance moved.

Work = Force x Distance

W = Fs cos θ

Given is the distance d =35 ft ,the force exerted F = 64lb and the angle of force from the horizontal direction is 45°.

Substituting the values, work done will be

W =64 x 35x cos 45°

W = 1583.9 lb.ft

Thus, the work done will be 1583.9 lb.ft

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