Earth's sky is blue during the day because:a. the molecules in the atmosphere scatter blue wavelengths of lightb. the atmosphere absorbs blue wavelengths of lightc. the sun produces more blue wavelengths than it produces in any other colord. red wavelengths are lost as solar radiation passes through the vacuum of space

Detection methods to measure the gravitational tug of a planet on its star that is allowing us to estimate planetary mass is : (c) the astrometric and doppler methods.

Method for finding extrasolar planets and brown dwarfs from radial-velocity measurements through observation of doppler shifts in the spectrum of the planet's parent star is called doppler spectroscopy.

It is also known as the radial-velocity method or the wobble method.

Method that detects the motion of a star by making precise measurements of its position on the sky is called astrometry. This technique can be used to identify the planets around a star by measuring small changes in the position of the stars.

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Answer:

Power = 130 watt

Explanation:

Power is described as the ability to do work, it is also defined as the amount of work in Joules done in a given time in seconds. Mathematically, it is represented as:

\(power = \frac{work (J)}{Time (s)}\)

In this example, power is calculated as follows:

Work = 39000 J

Time = 5 minutes

converting the time from minutes to seconds:

1 minute = 60 seconds

∴ 5 minutes = 60 × 5 = 300 seconds

\(\therefore power = \frac{39000}{300} \\power = 130 watt\)

N:B the unit for power can also be represented as Joules/seconds or J/s or JS⁻¹

A grinding wheel with rotational inertia I gains rotational kinetic energy K after starting from rest.  the expression for the grinding wheel’s final rotational speed (ω) in terms of the variables I and K is:

Ω = √(2K/I)

To determine the expression for the grinding wheel’s final rotational speed, we can apply the principle of conservation of energy. In this case, the initial energy of the wheel is zero (since it starts from rest), and the final energy is the rotational kinetic energy K.

The rotational kinetic energy (K) of an object is given by the formula:

K = (1/2) I ω^2

Where:

K is the rotational kinetic energy

I is the rotational inertia (moment of inertia) of the grinding wheel

Ω is the angular velocity (rotational speed) of the grinding wheel

Rearranging the equation, we can solve for ω:

2K = I ω^2

Dividing both sides of the equation by I:

2K/I = ω^2

Taking the square root of both sides to solve for ω:

Ω = √(2K/I)

Therefore, the expression for the grinding wheel’s final rotational speed (ω) in terms of the variables I and K is:

Ω = √(2K/I)

This equation tells us that the final rotational speed of the grinding wheel depends on the ratio of the rotational kinetic energy K to the rotational inertia I. The larger the kinetic energy or the smaller the moment of inertia, the faster the wheel will rotate.

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Hope it helps.

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If a car, starting from rest, accelerates at 4.0 m / sec², then its velocity at the end of 8.0 seconds would be 32.0 meters per second.

The rate of change of the velocity with respect to time is known as the acceleration of the object.

As given in the problem if a car, starting from rest, accelerates at 4.0 m / sec ² , then we have to find its velocity at the end of 8.0 seconds,

By using the first equation of the motion to calculate the velocity of the car after 8.0 seconds.

v = u + a × t

  = 0 + 4.0 × 8.0

  = 0 + 32.0

   = 32.0 m / s

Thus, If a car, starting from rest, accelerates at 4.0 m / sec², then its velocity at the end of 8.0 seconds would be 32.0 meters per second.

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Answer:

kinetic energy = 1 / 2 mv²

kinetic energy = 1 / 2 × 20 × 10 ²

kinetic energy = 1000 joules

.........

The temperature reading of 50°C is equivalent to 323.15 K in the Kelvin scale.

To convert a temperature reading from Celsius to Kelvin, you need to add 273.15 to the Celsius value. This adjustment is necessary because the Kelvin scale starts from absolute zero, which is 273.15 degrees Celsius.

In this case, you have a temperature reading of 50 degrees Celsius. To convert it to Kelvin, you add 273.15 to the Celsius value:

Temperature in Kelvin = 50°C + 273.15

Calculating this expression:

Temperature in Kelvin = 323.15 K

Therefore, if the temperature reading in Celsius is 50°C, the corresponding temperature in Kelvin is 323.15 K.

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The net force is the hypotenuse of the triangle and the value of the net force is 14.14 N.

The net force is the force that has the same effect in magnitude and direction as two  or more forces acting together. We know that force is a vector quantity thus it does have both magnitude and direction.

Since force is a vector, we need to look at the direction of the forces in order to find out what the direction of the net force would have to be. A close look at the image would show us that the net force is the hypotenuse of the triangle.

The value of the net force is;

R = √(10)^2 + (10)^2

R = 14.14 N

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Based on the given information, we know that there is an unknown planet with two moons in circular orbits. The table provides hypothetical data about the moons, which we can use to make calculations. To start, we need to look at the table and see what information is given. We have the masses of both moons (m1 and m2), as well as their distances from the planet (r1 and r2). We also have the gravitational constant, which is g = 6.67 × 10^-11 nm^2/kg^2.

Using this information, we can calculate the gravitational force between each moon and the planet using the formula F = G(m1m2)/r^2, where G is the gravitational constant, m1 and m2 are the masses of the moons, and r is the distance between the moon and the planet. Let's start by calculating the gravitational force between the first moon and the planet. We have m1 = 8.0 x 10^22 kg and r1 = 4.0 x 10^5 nm. Plugging these values into the formula, we get:
F1 = (6.67 x 10^-11)(8.0 x 10^22)(5.0 x 10^5)^2
F1 = 1.34 x 10^32 N
Now, let's calculate the gravitational force between the second moon and the planet. We have m2 = 5.0 x 10^22 kg and r2 = 3.0 x 10^5 nm. Plugging these values into the formula, we get:
F2 = (6.67 x 10^-11)(8.0 x 10^22)(4.0 x 10^5)^2
F2 = 4.45 x 10^31 N

Next, we can use the gravitational forces to calculate the orbital velocities of the moons. We can do this using the formula v = (GM/r)^0.5, where G is the gravitational constant, M is the mass of the planet, and r is the distance between the moon and the planet. To calculate the orbital velocity of the first moon, we need to know the mass of the planet. Unfortunately, this information is not given in the table, so we can't make this calculation. However, we can still calculate the orbital velocity of the second moon. Let's assume that the mass of the planet is 5.0x 10^24 kg (which is roughly the mass of Earth). Plugging in the values for F2, G, and r2, we get:
v2 = (GM/r2)^0.5
v2 = ((6.67 x 10^-11)(5.0 x 10^24)/(3.0 x 10^5))^0.5
v2 = 1.98 x 10^3 m/s
So the orbital velocity of the second moon is approximately 1.98 x 10^3 m/s.
Overall, without knowing the mass of the planet, we cannot fully determine the orbital velocities of both moons. However, we were able to calculate the gravitational forces between the planet and each moon using the given data in the table.

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Answer:

Are similar in pattern

Explanation:

edge 2021

A 200 kg snowmobile having the same momentum will travel at 45 m/s.

Momentum of an object is the product of mass and speed of an object.

P = mv

where;

m₁v₁ = m₂v₂

v₂ = m₁v₁/m₂

v₂ = (300 x 30)/200

v₂ = 45 m/s

Thus, a 200 kg snowmobile having the same momentum will travel at 45 m/s.

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One-third of the way between points a and b. The correct option is D.

When an object is attached to a spring and is oscillating between two points, its kinetic energy is a minimum at the points where its potential energy is at its maximum. At point a and b, the object comes to a stop and its potential energy is at its maximum. Therefore, the object cannot be located at points a or b when its kinetic energy is a minimum.

When the object is located one-third of the way between points a and b, it has a balance of potential energy on both sides. This means that the object will have the least kinetic energy at this point. Therefore, the correct answer is option D.

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c) To determine the velocity of the motion at the given time, consider that the velocity is also the area under the line of the graph a vs t.

Between t=0s and t = 2 s, the area under the line is:

A1 = 2 X 2 = 4

Then, until t = 2s the velocity is 4 m/s

The area between t = 2s and t = 4 s is:

A2 = 2 x 0 = 0

The area between t = 4s and t = 5s, the area is:

A3 = 2 x 1 = 2

Now, consider that the velocity is the sum of the previous areas, but taking areas on the negative y-axis as negative ones. Then, you have:

A = A1 + A2 - A3 = 4 + 0 - 2 = 2

Hence, the velocity is 2 m/s

Answer:

velocity

Explanation:

Velocity represents the direction of an object with a specified speed

The answer is photocoagulation.

The use of a laser beam to seal leaky blood vessels and to prevent the growth of new ones in diabetic retinopathy is called laser photocoagulation.

What is photocoagulation?

A minimally invasive method used to treat numerous retinal illnesses is photocoagulation of the retina, also known as retinal laser photocoagulation. The retina may expand due to aberrant leaky blood vessels developing across it in a number of disorders. Laser photocoagulation uses thermal energy above 65 °C to burn the retinal tissue by creating thermal burns. This can prevent the retina from being damaged by the bleeding blood vessels. In addition to causing fibrosis, laser photocoagulation can also seal retinal tears. Laser photocoagulation is typically unable to recover already lost vision in cases of retinal disease, but it can slow the progression of the condition, lower the chance of further vision loss, and preserve residual vision. The likelihood of problems following the operation is quite minimal.

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The use of a laser beam to seal leaky blood vessels and to prevent the growth of new ones in diabetic retinopathy is called laser photocoagulation.

What is photocoagulation?

A minimally invasive method used to treat numerous retinal illnesses is photocoagulation of the retina, also known as retinal laser photocoagulation. The retina may expand due to aberrant leaky blood vessels developing across it in a number of disorders.

Laser photocoagulation uses thermal energy above 65 °C to burn the retinal tissue by creating thermal burns. This can prevent the retina from being damaged by the bleeding blood vessels. In addition to causing fibrosis, laser photocoagulation can also seal retinal tears.

Laser photocoagulation is typically unable to recover already lost vision in cases of retinal disease, but it can slow the progression of the condition, lower the chance of further vision loss, and preserve residual vision. The likelihood of problems following the operation is quite minimal.

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Answer:

A Venus Fly trap

Explanation:

Insectivorous plants like pitcher plant and venus fly trap snack on flies or insects.

Therefore, insectivorous plants like pitcher plant and venus fly trap snack on flies or insects.

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Venus has relatively few impact craters and these craters are distributed fairly evenly over the entire planet.

-This suggests that older impact craters were covered over everywhere on the planet.

The solar system is an arrangement of the sun and the planets. The sun is at the focus of the solar system and it is surrounded by the planets moving radially outwards from the focus. This is the heliocentric model of the solar system.

Now, the magnitude of gravity on a planet determines the weight of a body on that planet. The greater the gravitational pull, the greater the weight of the object on that planet.

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the right answer of the question is true

Answer:

It is Limiting Reactant

Explanation:

A Satellite revolves around the plant at altitude equal to R , radius of planet . The relationship between new gravitational force (f₄) and gravitational force f₀ is f₄ = 4 f₀.

.

Gravity is the force that attracts any two objects that have mass. Gravity is called gravitational force because it always tries to pull mass together and never push it away. In fact, every object, including you, is pulling on every other object throughout the universe! This is called Newton's law of universal gravitation. It is very noticeable in celestial bodies with huge masses such as the Sun, Earth, and Moon. This is because the force is proportional to the mass of the object. It is responsible for the movement of the planets around the sun and the moon around the earth. People also exert forces on each other, but due to their relatively small mass this is not very important . It is noted by G and mathematically ,

Gravitational force= Gm₁×m₂ /d²

where m₁ and m₂ are masses of two objects and d ----> distance between the centres of two objects and G is gravitational constant.

In question we one body is planet and other will be satellite.

Let us consider

M ----> Mass of plant

m------> mass of satellite

R ---> radius of planet

In first case, when satelite at a distance say altitude is equal to radius of planet (R) and the distance between the centres of two masses is 2R. Gravitational force between them is

(f₀ ) = GMm / (2R)²= GMm/ 4R² ---(1)

where, G---> gravitational constant

In second case, the satalite is on surface of a planet and distance between two masses is R.

New gravitational force between two bodies is

f₄ = GMm/ R²-----(2)

comparing (1) and (2) we get,

f₀ = f₄/4 => f₄ = f₀

Hence, the relationship between new gravitational force (f₄) and and gravitational force (f₀) is f₄= 4f₀.

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Answer:

Transverse, I took a quiz and got it right :)

Answer:

transverse

Explanation:

The suitable dimensions for tied and spiral columns of Required loads, Stresses, Gross area, Area of steel are 1142.86 kN, 12.6 MPa, 90.89 m².

The required loads can be determined by dividing the factored load by the appropriate load factor. For this example, let's assume a load factor of 1.4. Required loads = Factored load / Load factor

= 1600 kN / 1.4

= 1142.86 kN

Determine the allowable stresses: a concrete compressive strength of fc' = 28 MPa, the allowable compressive stress (fa) can be calculated using the formula:

= 0.45 * 28 MPa

= 12.6 MPa

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The pressure transmitted in the hydraulic system is approximately 195.33 atm. The pressure transmitted in the hydraulic system can be calculated by dividing the force applied by the area of the pedal cylinder.

The given force is 315 N and the diameter of the pedal cylinder is 0.450 cm. To calculate the area, we need to convert the diameter to meters by dividing it by 100. Thus, the radius of the pedal cylinder is 0.450 cm / 2 / 100 = 0.00225 m.The area of the pedal cylinder is then calculated using the formula for the area of a circle: A = π * r^2. Substituting the values, we have A = π * (0.00225)^2 ≈ 0.0000159 m^2.Now, we can calculate the pressure by dividing the force (315 N) by the area (0.0000159 m^2). The pressure transmitted in the hydraulic system is approximately 19,811,320.75 Pa.To express the pressure in atmospheres, we can convert Pa to atm by dividing by the standard atmospheric pressure, which is approximately 101,325 Pa. Therefore, the pressure transmitted in the hydraulic system is approximately 195.33 atm.

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Answer:intensity of an electric field (E)

charge (q)

Force (F)

E=F/q

E=20N/.5C

E=40N/C

Explanation:

The Electric field intensity will be  40 N/C

The electric field intensity at a point is the force experienced by a unit positive charge placed at that point.

Electric field intensity(E) = force (F)/ charge(q)

given

charge = 0.50 C

Force = 20 N

Electric field intensity = ?

E = 20 N / 0.50 C

E = 40 N/C

The Electric field intensity will be  40 N/C

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Answer:

Motion energy, or energy of motion

Explanation:

Answer:

Kinetic Energy is the energy of movement

Explanation:

The force acting on an alpha particle traveling at 2v parallel to a magnetic field of strength 2B is 8F.

The force experienced by a charged particle moving through a magnetic field is given by the equation F = qvB, where F is the force, q is the charge of the particle, v is its velocity, and B is the magnetic field strength. In this scenario, the electron traveling at speed v perpendicular to a magnetic field of strength B experiences a force F.

When considering an alpha particle, which consists of two protons and two neutrons, it has a charge of +2e, where e is the elementary charge. Since the alpha particle is traveling parallel to the magnetic field, the force experienced is given by F = (2e)(2v)(2B) = 8F.

Therefore, the correct answer is D) 8F, indicating that the force acting on the alpha particle is eight times the force experienced by the electron.

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Answer:

1) Use multiple instruments to measure

2) Take several measurements

3) Control the other variables delicately  

4) Be meticulous when measuring

Answer:

Srry for the delay but this might help ppl in the future

Explanation:

PEACE OUT!

a) The efficiency of this carnot engine = 0.672 = 67.2%

Carnot heat engine converts 67.2% of the heat it receives to work.

b) The amount of heat rejected to the sink per cycle = 164 kJ

\(Q_{H}\) = 500 kJ

Efficiency of this carnot engine =?

Amount of heat rejected to the sink per cycle =?

a) Carnot heat engine is a reversible heat engine; its efficiency can be calculated from:

\(n_{th,rev} = 1 - \frac{T_{L} }{T_{H} }\)

\(n_{th,rev} = 1 - \frac{(30+273)K}{(652+273)K}\)

= 0.672

The efficiency of this carnot engine = 0.672 = 67.2%

b) The amount of heat rejected \(Q_{L}\) by heat reversible engine can be calculated from:

​\((\frac{Q_{H} }{Q_{L} } )_{rev} = \frac{T_{H} }{T_{L} }\)

\(Q_{L,rev} = \frac{T_{L} }{T_{H} } Q_{H,rev}\)

= \(\frac{(30+273)K}{(652+273)K} (500KJ)\)

= 164KJ

Carnot heat engine converts 67.2% of the heat it receives to work.

The amount of heat rejected to the sink per cycle = 164 kJ

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