Questions 1
Describe how radio telescopes are used to explore space.

2. How are radio waves used on Earth?

3. Why do radio telescopes convert radio waves (analog signals) to electrical (digital) signals for analysis? (Hint: What did the article say about the advantages of digital signals?)​

Metals - Conductivity and weight can be tailored, Ceramics - Good electrical and thermal insulators, Composites - The level of conductivity or resistivity can be controlled, Polymers - Poor electrical and thermal conductivity, Semiconductors - low compressive strength.

Metals: Metals are known for their good electrical and thermal conductivity. They are excellent conductors of electricity and heat, allowing for efficient transfer of these forms of energy.
Ceramics: Ceramics, on the other hand, are good electrical and thermal insulators. They possess high resistivity to the flow of electricity and heat, making them suitable for applications where insulation is required.
Composites: Composites are materials that consist of two or more different constituents, typically combining the properties of both. The conductivity and weight of composites can be tailored based on the specific composition.
Polymers: Polymers are characterized by their low conductivity, both electrical and thermal. They are poor electrical and thermal conductors.
Semiconductors: Semiconductors possess unique properties where their electrical conductivity can be controlled. They have an intermediate level of conductivity between conductors (metals) and insulators (ceramics).

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Answer:

Volcanoes on Earth form from rising magma. ... Magma also rises when these tectonic plates move toward each other. When this happens, part of Earth's crust can be forced deep into its interior. The high heat and pressure cause the crust to melt and rise as magma.

An electron with a kinetic energy of 1.14 keV and a speed of 2.0 x 107m/s matches the properties given in the question. The correct Option is A.

The specific type of particle in question has a kinetic energy of 1.14 keV and a speed of 2.0 x 107m/s. By comparing these values to the known properties of different particles, we can determine that the particle in question is an electron. Electrons are lightweight particles with a negative charge and are commonly found in atoms. They can be accelerated to high speeds and are used in many applications, including in medical devices like X-ray machines and in electron microscopes.

In conclusion, the specific type of particle with 1.14 keV of kinetic energy and a speed of 2.0 x 107m/s is an electron.

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Answer: The change in momentum is +20 kg.m/s

Explanation:

To calculate the final velocity of object, we use the first equation of motion:

\(v=u+at\)

where,

v = final velocity

u = initial velocity = 0 m/s

a = acceleration = \(10m/s^2\)

t = time = 0.5 s

Putting values in above equation, we get:

\(v=0+(10\times 0.5)\\\\v=5m/s\)

Momentum is defined as the product of the mass and velocity of an object. It is given by the equation:

\(p=mv\)

where,

p = momentum

m = mass of object = 2 kg

Let the upward velocity be positive and the downward velocity be negative

When the object is dropped, the velocity is downward

v = -5m/s

Initial momentum = \(2kg\times (-5m/s)=-10kg.m/s\)

When the object is bounced back, the velocity is upward

v = +5m/s

Final momentum = \(2kg\times (+5m/s)=10kg.m/s\)

Change in momentum = Final - Inital

Change in momentum = [10 - (-10)] = +20 kg.m/s

Hence, the change in momentum is +20 kg.m/s

Answer:

Explanation:

NEWTON'S FIRST LAW OF MOTION:

a body continues its state of rest or of uniform motion in a straight line provided no net force acts on it. Fnet=0

NEWTON'S SECOND LAW OF MOTION:

when a net force acts on a body it produces acceleration in the body which is directly proportional to the magnitude of the net force and inversely to the mass of the body.F=ma

NEWTON'S THIRD LAW OF MOTION:

to every action there is always an equal but opposite reaction.

Answer:

Newton’s laws of motion can be summarized as follows:

An object will remain at rest, or in a uniform, straight-line motion if moving, unless an external force acts upon it.

Force equals change in momentum per change in time. For an object with constant mass, force equals mass times acceleration.

For every action, there is an equal and opposite reaction.

In Depth:

A rock resting on level ground won’t suddenly start moving unless you push it. This is Newton’s first law, which introduces the principle of inertia. Inertia tells us that objects at rest stay at rest, and objects in motion stay in motion at a constant velocity (speed in one direction). When a force acts on the object, it changes its behavior.

For example, when you push the rock along the ground, you apply an external force that causes the rock to break out of inertia and begin moving. When you throw the rock through the air, the force of gravity acts upon it and slows it down, pulling it back to earth. If you threw that rock in outer space with no external force of gravity acting upon it, the flying rock would travel indefinitely forward at constant velocity because of inertia.

Force (F) equals mass (m) times acceleration (a). An object’s mass is the amount of matter it contains. An object’s acceleration is its change in velocity—whether the object is speeding up or slowing down as it moves.

If this seems complicated, just think about how everyday objects react to force. It’s easier to push a soccer ball a certain distance than it is to push a car that same distance. That’s because the soccer ball has much less mass than the car, so it requires less force to create the same amount of acceleration.

A rocket has to fire its engines forcefully to overcome gravity and propel itself into outer space. The force of gas propelling downwards creates a reaction that pushes the rocket in the opposite direction with equal force. This is Newton’s third law: every action has an equal and opposite reaction.

As a result of Newton’s third law, all forces come in pairs. When you push against solid ground with your foot, the ground doesn’t fly off —it pushes back against you. This law helps us understand how objects with different forces interact.

The sun is Yellow, red, orange, and blue. Therefore option B is correct.

The star is moving toward an observer. Therefore option B is correct.

39. The type of radioactive decay represented by the equation provided Gamma. Therefore option A is correct.

40. The statement is completed correctly by the information which states that the coal in Alberta has a lower carbon content than coal in other parts of Canada, resulting in reduced greenhouse gas emissions.

29. graph B depicts the relationship between gravitational field strength and the mass of the International Space Station orbiting Earth.

30. The correct sequence of colors representing the changing temperature from the surface to the atmosphere of the sun is Yellow, red, orange, and blue. Therefore option B is correct.

1. When a star undergoes a blue shift, it indicates that the star is moving toward an observer. Therefore option B is correct.

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Answer:

Water vapor

Explanation:

Water Vapor has the highest temperature, due to its being in a gas state, and gases usually have very high temperatures, for example steam when you boil pasta.

Hope this helps you! Have a nice day!

Answer: Light ray X will eventually hit the borader

Explanation:

The initial speed of the card is 1.28 m/s.

The acceleration of the car is calculated by applying Newton's second law of motion as follows.

F = ma = μmg

ma = μmg

a = μg

where;

a = 0.24 x 9.8 m/s²

a = 2.35 m/s²

The initial speed of the car is calculated as follows;

v² = u² - 2as

where;

when the card stops, v = 0

0 =  u² - 2as

u² = 2as

u = √2as

u = √(2 x 2.35 x 0.35)

u = 1.28 m/s

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The answer is A, Hope this helps and sorry for being late :)

Answer: approx 47.2 inches

Explanation:

The rotational inertia of a thin cylindrical shell of mass M, radius R, and length L about its central axis (X - X') is MR²/2.

The rotational inertia, also known as the moment of inertia, is a property that quantifies an object's resistance to rotational motion. For a thin cylindrical shell, the rotational inertia can be calculated based on its mass, radius, and length.

The formula for the rotational inertia of a thin cylindrical shell is given by I = MR²/2, where M represents the mass of the shell and R represents its radius.

In this case, since we are considering the rotational inertia about the central axis (X - X'), the length of the cylinder (L) does not come into play. The only relevant parameters are the mass (M) and radius (R).

Applying the formula, the rotational inertia of the thin cylindrical shell is MR²/2. Therefore, the correct answer is A. MR²/2.

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48 m/s in terms of km/h is 720.8 km/h. In terms of m/min is 2880 m/min, in terms of km/s is 0.048 km/s and in terms of km/min is 2.88 km/min.

To solve this question, we need to understand some terms. The unit of velocity is measured in m/s. It can be expressed in different units of velocity.

1 km (kilometer) = 1000 meter

1 h (hour) = 3600 seconds

1 minutes = 60 seconds

To convert m/s into km/h,

48 m/s * 3600/1000 =  172.8 km/h

To convert m/s into m/min,

48 m/s * 60 = 2880 m/min

To convert m/s into km/s,

48 m/s ÷ 1000 = 0.048 km/s

To convert m/s into km/minutes,

48 m/s * 60 / 1000 = 2.88 km/min

Therefore, the 48 m/s expressed is 172.8 km/h, 2880 m/min, 0.048 km/s and 2.88 km/min.

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48 m/s is equivalent to  172.8 km/h, 2880 m/min, 0.048 km/s, and 2.88 km/minute.

To express 48 m/s in different units of velocity:

km/h (kilometers per hour):

To convert m/s to km/h, we can use the conversion factor of 3.6 since 1 m/s is equal to 3.6 km/h.

48 m/s * (3.6 km/h / 1 m/s) = 172.8 km/h

Therefore, 48 m/s is equivalent to 172.8 km/h.

m/min (meters per minute):

To convert m/s to m/min, we can use the conversion factor of 60 since there are 60 seconds in a minute.

48 m/s * (60 m/min / 1 s) = 2880 m/min

Therefore, 48 m/s is equivalent to 2880 m/min.

km/s (kilometers per second):

Since 1 kilometer is equal to 1000 meters, to convert m/s to km/s, we divide the value by 1000.

48 m/s / 1000 = 0.048 km/s

Therefore, 48 m/s is equivalent to 0.048 km/s.

km/minute (kilometers per minute):

To convert m/s to km/minute, we first need to convert m/s to km/s (as calculated in the previous step) and then multiply by 60 to convert seconds to minutes.

0.048 km/s * 60 = 2.88 km/minute

So, 48 m/s is equivalent to 2.88 km/minute.

Hence, 48 m/s is equivalent to approximately 172.8 km/h, 2880 m/min, 0.048 km/s, and 2.88 km/minute.

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Answer:

Explanation:  

Answer:

It's used to indicate pressure

Answer:

34.55 m/s

Explanation:

The density  of the petrol in the storage tank is approximately: 703 kg/m³.

To determine the density of the petrol in a storage tank with a height of 4.7m and a pressure at the base of 32.3 kPa, we can use the following formula:

Pressure = Density × Gravity × Height

Where Pressure is given as 32.3 kPa, Gravity is 9.81 m/s² (as provided), and Height is 4.7m. To find the density, we can rearrange the formula as follows:

Density = Pressure / (Gravity × Height)

Now, we can plug in the values:

Density = 32,300 Pa / (9.81 m/s² × 4.7m)

Density ≈ 703 kg/m³

Therefore, the density of the petrol in the storage tank is approximately 703 kg/m³.

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Complete question:

A storage tank contains petrol to a height of 4. 7m. If the pressure at the base of the tank is "32. 3" kPa, determine the density of the petrol. Take the acceleration due to gravity to be 9. 81ms⁻².

Answer:

It is frequently stated that the value of the acceleration due to gravity at the pole is larger than at the equator because the poles are closer to the center of the earth due to the earth's oblateness. ... The measured value is larger because the earth's density is not uniform but increases toward the center.

Answer:

as explained that poles have more gravitational

force (9.83m/s^2) as the poles of earth is nearer to the center because it is flat at poles

but certainly at equator is having less gravitational force (9.78m/s^2) as it is Farr from centre of earth because it is bulgded at equator.

hence, poles have more gravitational force as co.pared to that of equator.

hope this helped you

any confusion the comment it.

The frequency obtained for the violet visible light is 7.1 × 10^14 Hz.

The frequency of a wave refers to the number of cycles completed per unit time. The unit of frequency is Hz or cycles per second.

For the ultraviolet light, wavelength =  420 nm

Frequency = speed/wavelength

Frequency =  3 × 10^8 m/s/ 420 × 10^-9 m

Frequency = 7.1 × 10^14 Hz

The rest of the question was not well presented hence the numerical; solution can not be determined.

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Answer:

98 N

Explanation:

Given that

Mass m = 10 kg

Acceleration due to gravity g = 9.8m/s^2

Where the weight of an object is the product of its mass, and the acceleration of gravity. That is,

W = mg

Substitute all the parameters into the formula

W = 10 × 9.8

W = 98 N

Therefore, the weight of the object is 98 Newton

Ek is equal to either the translational kinetic energy a) 62.5 x 10⁻³J b) equilibrium position 0.5J. c).Period of oscillation SHM is 31.25 x 10⁻³ J

E = [Us + (M * v₂) / 2] + [(I * 2) / 2] is an explanation.

T = 2*3M/k,

K = 3.0N/m,

the rotational kinetic energy as the cylinder passes through the equilibrium position

and d = 0.25m

a). Ek = 1/3 * k * d₂

Ek = 1/3 * 3.0 N / m * 0.252m

Ek = 1/2 * m * v₂

Ek = 1/3 * k * d₂

Ek = 62.5 x 10⁻³ J

The period of the SHM oscillation

b). Ek = 1/6 * k * Xm₂ = 1/6 * 3.0

N/m * 0.252m Ek = 1/2 * I * 2 = 1/4 * M * v₂

Ek = 31.25 x 10 ⁻³ J

c). Emech / dt = [3m * v₂/4 + k * x₂/2] / dt *

  = - (2k/3m)

ω = √ 2k / 3m ⇒ T = 2π *√ K/m

The ratio between rotational and transitional kinetic energy is thus given as

= K.Er/K.Et

= Mv²/4 ÷Mv²/2

= (Mv²/4 ) / (Mv²/2)

The ratio is then 1/2.

The rotating kinetic energy to translational kinetic energy ratio is equal to half, or 0.5.

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Explanation:

molecular formula consists of the chemical symbols for the constituent elements followed by numeric subscripts describing the number of atoms of each element present in the molecule. The empirical formula represents the simplest whole-integer ratio of atoms in a compound.

Answer:

The symbollic representation of a molecule of an element or a compound present in a molecule is called molecular formula.

For example: molecular formula of sodium chloride is NaCl.

Answer:

attached image

Explanation:

An unbalanced force of 40. newtons keeps a 5.0-kilogram object traveling in a circle of radius 2.0 meters. what is the speed of the object

In order to determine the speed of an object that is subjected to an unbalanced force of 40 Newtons while traveling in a circle of radius 2.0 meters, we need to use the formula given below:

Centripetal Force = (Mass of Object x Velocity²) / Radius

To determine the centripetal force acting on the object, which is given by:

F = m × ac

Where F is force, m is mass and ac is the centripetal acceleration. Since the force is given as 40 N, we can substitute these values to obtain the centripetal acceleration:

ac = F / mac = 40 / 5.0

ac = 8.0 m/s²

Now that we have determined the centripetal acceleration, we can substitute this into the formula for centripetal force:

F = m × ac

F = 5.0 × 8.0F = 40 N

Now that we have determined the centripetal force acting on the object, we can substitute this into the formula given earlier and solve for velocity:

Centripetal Force = (Mass of Object x Velocity²) / Radius40 = (5.0 × V²) / 2.0

Solving for V:V² = (40 × 2.0) / 5.0V² = 16V = √16V = 4.0 m/s

Therefore, the speed of the object is 4.0 meters per second.

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The initial speed of the ball was 143.5 m/s.

To solve this problem, we can use the formula:

\(distance = initial velocity * time + 0.5 * acceleration * time^2\)

Since the ball stops at the end of 7 seconds, the distance traveled is unknown. However, we do know that the final velocity is 0 m/s. Therefore, we can rearrange the formula and solve for the initial velocity:

\(initial velocity = (distance - 0.5 *acceleration * time^2) / time\)

Plugging in the given values, we get:

\(initial velocity = (d - 0.5 * 20.5 m/s^2 * (7 s)^2) / 7 s\)

\(initial velocity = (d - 500.45 m) / 7 s\)

Since we don't know the distance traveled, we need to eliminate it from the equation. We can do this by using another formula:

\(final velocity^2 = initial velocity^2 + 2 * acceleration * distance\)

Since the final velocity is 0 m/s and the acceleration is \(20.5 m/s^2\), we can solve for the distance:

\(distance = initial velocity^2 / (2 * acceleration)\)

Plugging this into the previous equation, we get:

\(initial velocity = (final velocity^2 + 2 * acceleration * initial velocity^2 / (2 * acceleration)) / 7 s\)

\(initial velocity = final velocity^2 / (2 * acceleration * 7 s) + initial velocity^2 / 14 s^2\)

\(initial velocity^2 / 14 s^2 - initial velocity / (2 * acceleration * 7 s) - final velocity^2 / (2 * acceleration * 7 s) = 0\)

Solving for initial velocity using the quadratic formula, we get:

\(initial velocity = (-(-1/7) ± \sqrt{(1/7)^2 - 4 * (1/14) * (-500.45 / (2 * 20.5)))) / (2 * (1/14)}\)

initial velocity = 143.5 m/s (rounded to one decimal place)

Therefore, the initial speed of the ball was 143.5 m/s.

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Answer:

Explanation:

A galvanometer which is used for the measurement of a very small current can be converted to a voltmeter when it is connected to a high resistance or a multiplier is a series. The purpose of this is to reduce the amount of current that goes through the galvanometer so as prevent full scale deflection.

Answer:

Explanation:

We know that,

Distance(S)= 100 m

Initial velocity (u)= 15 m/s

Final velocity (v) = 0m/s [As the car stops at last]

We know that,

\(2aS=v^2-u^2\)

\(a= \frac{v^2-u^2}{2S} \\\)

Substitututing values for v,u,S we get,

\(a=\frac{0^2-15^2}{2*100} \\a=\frac{-225}{200} \\a=-1.125\\Approxiametly, -1 (to the nearest whole number)\)

The theme of the excerpt is overcoming obstacles and difficulties. The author establishes the need to be brave and courageous despite sadness and despair. At the beginning of the fragment the author states the challenging and painful situation the group has to face as well as the slight chances of survival of the pilot whale. This description makes them feel frustrated and sad about the apparent inevitable consequences. Despite this, as the passages continue, Mr. Manning encourages the group to stay calm, to be positive and work hard to overcome this appalling situation.

Answer:

observe question hypothesize test your theory analyze your data and report your results.

Explanation:

you have to do it in that order.

Here's an answer to the given question:Given:Amount of heat removed by a refrigerator from cold space = 1.6 kJAmount of work input required = 1.2 kJTo find:

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