At high noon, the Sun delivers 1000W to each square meter of a blacktop road. If the hot asphalt transfers energy only by radiation, what is its steady-state temperature?

Answer:

hi. :)))))))))))))))))))))

Answer:

c

Explanation:

The critical t-value for a 98% confidence interval with 19 degrees of freedom is approximately 2.860, representing the number of standard deviations from the mean for that confidence level.

The critical t-value is a value from the t-distribution that is used in hypothesis testing and constructing confidence intervals. It represents the number of standard deviations away from the mean that corresponds to a specific level of confidence.

In hypothesis testing, the critical t-value is compared to the test statistic to determine if there is enough evidence to reject the null hypothesis. If the test statistic falls beyond the critical t-value, it suggests that the observed data is unlikely to have occurred by chance, and we reject the null hypothesis.

In constructing confidence intervals, the critical t-value is used to determine the range of values that are likely to contain the true population parameter with a certain level of confidence. The critical t-value, along with the sample mean and standard error, helps calculate the upper and lower bounds of the confidence interval.

The critical t-value depends on two factors: the desired confidence level and the degrees of freedom. As the confidence level increases, the critical t-value becomes larger, meaning a wider range of values is included in the confidence interval. Additionally, the critical t-value decreases as the degrees of freedom increase, indicating greater precision in the estimate.

To determine the value of t for a 98% confidence interval with 19 degrees of freedom, we can consult a t-table or use statistical software. The t-distribution is a family of distributions that depends on the degrees of freedom. In this case, we have 19 degrees of freedom.

Using a t-table or statistical software, we can find the critical t-value for a 98% confidence interval and 19 degrees of freedom. The critical t-value represents the number of standard deviations from the mean for a specific confidence level.

Therefore, For a 98% confidence interval with 19 degrees of freedom, the critical t-value is approximately 2.860.

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Since the focus of a convex mirror is itself virtual and there is no actual light travelling through it, it can never produce a genuine image. The source of light appears to be behind the mirror, and the light rays never seem to merge in front of the mirror.

The light rays diverge after reflection, thus they will never cross on the mirror's object side. Convex mirrors therefore create fictitious pictures that are situated somewhere beyond the mirror.

Convex and plane mirrors only create virtual pictures. A true image can only be produced using a concave mirror, and only if More than a focal length separates the item from the mirror's surface.

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Answer:

The star's luminosity rises above its previous level. Because it is so cool, the surface will be red, and it will be much farther away from the center than it was during the earlier stages of star evolution. Despite its lower surface temperature, the red giant has a large surface area, which makes it very luminous.

Answer:

Hope it helps you :)

Explanation in the pic above.

The velocity of the object when it reaches the ground will be 76.68 m/s.

The second equation of motion is given by -

S = ut + 1/2 at²

Given is the Eiffel tower which is 300 meters tall.

Height of tower [S] = 300 meters

Acceleration of object [a] = + 9.8 m/s²

Initial velocity [u] = 0 m/s

Assume that its velocity when it reaches the ground is v m/s.

Effect of air friction = Negligible

Using the third equation of motion -

v² - u² = 2aS

v² = 2gS

v² = 2 x 9.8 x 300

v² = 5880

v = √5880

v = 76.68 m/s

Therefore, the velocity of the object when it reaches the ground will be 76.68 m/s.

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Answer:

y = 33.93 10⁵ m

Explanation:

This is an interference exercise, for the contributory interference is described by the expression

           d sin θ = m λ

let's use trigonometry for the angle

           tan θ = y / L

how the angles are small

          tan θ = sin θ / cos tea = sin θ

we substitute

         sin θ = y / L

        d y / L = m λ

         y = m λ L / d

the light fulfills the relation of the waves

       c = λ f

       λ = c / f

       λ = 3 10⁸ /375

       λ = 8 10⁵ m

first order m = 1

let's calculate

        y = 1  8 10⁵  4030 10-9 / 950 10-9

        y = 33.93 10⁵ m

Answer:

a

Explanation:

Answer:

fbddb

Explanation:

dsbse

Answer:

The gas will change to a liquid

Explanation:

Basically condensation happens

The farthest bright galaxies that modern telescopes are currently capable of seeing are up to several billions of light-years away. The exact distance depends on various factors such as the sensitivity and resolution of the telescope, observational techniques, and the brightness of the galaxy itself.

Modern telescopes, such as the Hubble Space Telescope and large ground-based observatories equipped with advanced instruments, have greatly advanced our ability to observe and study distant galaxies. These telescopes can detect and capture the light from galaxies that existed when the universe was relatively young.

Through deep field observations and gravitational lensing techniques, astronomers have been able to observe galaxies that are more than 13 billion light-years away. These observations provide valuable insights into the early universe and its evolution.

It's important to note that the term "bright" is relative and can vary depending on the context and specific criteria used for brightness. Additionally, ongoing advancements in telescope technology continue to push the limits of observation, and future telescopes and space missions are expected to enable us to see even farther into the universe.

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Answer:

d. 2.14 x 10⁻⁴ kg/m³

Explanation:

Density is defined as the mass of an object per unit volume occupied by that object. The formula of density is, therefore, given as follows:

\(\rho = \frac{m}{V}\)

where,

ρ = density of platinum band = ?

m = mass of platinum band = 3 x 10³ kg

V = Volume displaced by Platinum band = 1.4 x 10⁷ m³

Therefore,

\(\rho = \frac{3\ x\ 10^{3}\ kg}{1.4\ x\ 10^{7}\ m^{3}}\\\\\rho = 2.14\ x\ 10^{-4}\ kg/m^{3}\)

Hence, the correct option is:

d. 2.14 x 10⁻⁴ kg/m³

Answer:

Space

Explanation:

Solar energy is energy from the Sun. This energy is in form of radiation heat and light. When solar energy reaches a surface it bounces off. This is because they are radiation waves.

When it reaches a velocity of 32 m/s, it is 571.2m high above the ground.

What does velocity refer to?

Velocity is the direction speed of an item in motion as a measure of the rate at which its location is changing as seen from a certain point of view and as measured by a specific unit of time.

The movement of an object that has been launched into the air is known as projectile motion. Only gravity is felt by the item after the initial force that launches it. Projectile and trajectory both refer to the same thing: an object.

Given

Initial velocity ,u =  84m/s

Final velocity, v =  32m/s

Gravity ,g = -10m/s (upward motion, against gravity )

We know, v = u + gt

32 = 84 -10t

10t  = 84-32

t = 5.2 s

Now using, s = ut +1/2 gt^2

s = [84*5.2] +1/2[10*5.2^2]

s = 436 + 135.2

s = 571.2m

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Billy jumps upward with a velocity of 4.2 m/s off a 6m high diving board.  . Billy will take 0.43 sec  to hit the water

The branch of physics that defines motion with respect to space and time, ignoring the cause of that motion, is known as kinematics.

using equation of kinematics

v = u + g*t

sign convention

positive y direction (upward) = +

negative y direction ( downward )  = -

v = u - g*t

0 = 4.2 - ( 9.8 * t )

t = 4.2 / 9.8

t = 0.43 sec

Billy will take 0.43 sec  to hit the water

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Fibers of the sweater lose electrons because electrons are leave it.

One of the ways of charging a body is by friction. Charges are transferred from one body to another when an object is rubbed against another. This is charging by friction.

A sweater has negative charges hence when the balloon is rubbed against the sweater, fibers of the sweater lose electrons because electrons are leave it.

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A baseball with the same kinetic energy as that of the Glashow resonance. Speed in 1.86 m/s would correspond to this energy.

To compare the energy of the Glashow resonance event with that of a baseball, we need to calculate the speed corresponding to the same kinetic energy.

To calculate the speed corresponding to the kinetic energy, we can use the equation:

\(Kinetic energy=\frac{1}{2} Mv^{2}\)

Given that the mass of the baseball is 146 g (0.146 kg), we can rearrange the equation to solve for velocity:

Since the Glashow resonance requires about 1,000 times more energy than what's produced in the most powerful colliders on Earth, we can assume the energy to be 1,000 times greater than the kinetic energy of the baseball.

By substituting the values into the equation and solving for velocity, we can find the speed in m/s that corresponds to the Glashow resonance energy. The calculation will provide the necessary value for comparison.

\(Velocity=\sqrt{\frac{2 K.E}{M} }\)

Velocity=\(\sqrt{\frac{2*1000}{146} }\)

Velocity=1.86 m/s

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Based on the equation, its inertia moment of a cones is 32.4 when regard to its axis.

The best way to grasp mass is the amount of material that any item or body is made of. There is mass in just about everything we are able to see. A seat, a chair, a bed, a ball, a glass, and even air are examples of items with mass. Whether anything is heavy or light depends on its mass.

Simply put, mass is indeed a measurement of a body's amount of matter. Matter is everything that has both volume and mass. Although mass cannot be seen, it can be quantified or quantified. Not all matter is visible.

This following formula can be used to represent the inertia moment of a solid cone;

I = 3 MR2/ 10

 = 3*3*6²/10

 =32.4

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Explanation:

c) aceleración

At 0.0804 km altitude the 1% of the mass of the atmosphere lies above and 99% of the mass lies below. Assumptions made are the global mean surface pressure of 1000 hPa is a representative value and the scale height is assumed to be constant throughout the entire atmosphere.

First, we need to calculate the pressure at the desired percentiles (1% and 99%) relative to the surface pressure.

For 1% of the mass lying above, we consider the pressure to be 1% of the surface pressure:

1% of 1000 hPa = 0.01 × 1000 hPa

= 10 hPa.

For 99% of the mass lying below, we consider the pressure to be 99% of the surface pressure:

99% of 1000 hPa = 0.99 × 1000 hPa

= 990 hPa.

Next, we use the exponential relationship between pressure and altitude:

P = P0 × exp(-z/H),

where P is the pressure at a given altitude, P0 is the surface pressure, z is the altitude, and H is the scale height.

To find the altitude z at which the pressure is equal to 10 hPa (1% of the surface pressure), we rearrange the equation:

10 hPa = 1000 hPa × exp(-z/H).

Taking the natural logarithm (ln) of both sides, we have:

ln(10 hPa / 1000 hPa) = -z / H.

ln(0.01) = -z / 8 km.

z = -8 km × ln(0.01).

Evaluating the expression:

z = -8 km × (-4.605)

= 36.84 km.

Therefore, 1% of the mass of the atmosphere lies above an altitude of approximately 36.84 km.

Similarly, to find the altitude z at which the pressure is equal to 990 hPa (99% of the surface pressure), we follow the same procedure:

990 hPa = 1000 hPa × exp(-z/H).

ln(990 hPa / 1000 hPa) = -z / H.

ln(0.99) = -z / 8 km.

z = -8 km × ln(0.99).

Evaluating the expression:

z = -8 km × (-0.01005)

= 0.0804 km.

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Answer:

1²/3 hours or ⁵/3 hours

Explanation:

Time = Distance ÷Speed

Therefore time = 20miles ÷ 12 miles per hour

=⁵/3 hours

The net enclosed charge is approximate \(2.71 * 10^{-8} C\).

The net enclosed charge within the surface is related to the electric flux by Gauss's law:

\(\phi = Q/\epsilon_0\)

where Q is the net enclosed charge and ε0 is the electric constant.

In this problem, the electric field is given by:

E = 3.0x i + 4.0 j

The flux through each face of the cube is given by:

Φ = E ⋅ A

where A is the area of the face.

Since the cube has sides of equal length, we can take x = y = z = s, where s is the length of the side of the cube.

Therefore, the area of each face is:

\(A = s^2\)

The flux through each face of the cube is then:

\(\phi_x = E_x A = 3.0sx^2\\\\\phi_y = E_y A = 4.0sy^2\\\\\phi_z = 0\)

The total flux through the cube is the sum of the fluxes through each face:

\(\phi_{total} = \phi_x + \phi_y + \phi_z = 3.0s^2 + 4.0s^2 + 0 = 7.0s^2\)

We are given that the net flux through the cube is 24 N⋅m²/C, so we can use Gauss's law to find the net enclosed charge:

\(Q = \phi \epsilon_ 0 = (24 Nm^2/C) / (8.85 * 10^{-12} N^{-1}m^{-2}C^2)\\Q = 2.71 * 10^{-8} C\)

Therefore, the net enclosed charge is approximate \(2.71 * 10^{-8} C\).

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Answer:

25N

Explanation:

The force the head of the nail is doing on the hammer is 25N. This is based on the newton's third of law of motion.

It states that "action and reaction are equal but opposite in direction".

A body exerting a force of 25N on another will get a reaction force of an equal but negative magnitude of force in the opposite direction.

The answer is 200 joules.

Answer:

Its answer is 200joule.

Explanation:

Hope it's helpful for you

The question is asking whether it is possible to find a magnetic vector potential for a given uniform surface current flowing in the xy plane and generating a magnetic field for different regions of space.

To determine whether it is possible to find a magnetic vector potential for the given scenario, we need to consider the conditions that must be satisfied. In general, a magnetic vector potential A can be found if the magnetic field B satisfies the condition ∇ × A = B. This is known as the magnetic vector potential equation.

In the given situation, the magnetic field is different for the regions above and below the xy plane. For z > 0, the magnetic field is described as B = MoK -î, and for z < 0, it is described as B = -MoK -î. To find the magnetic vector potential, we need to determine if there exists a vector potential A that satisfies the equation ∇ × A = B in each region.

By calculating the curl of A, we can check if it matches the given magnetic field expressions. If the curl of A matches the magnetic field expressions for both regions, then it is possible to find a magnetic vector potential for the given scenario. However, if the curl of A does not match the magnetic field expressions, then it is not possible to find a magnetic vector potential that satisfies the conditions.

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Answer:

8000cm³/hr

Explanation:

Given parameters:

Volume of the liquid draining off per hour   = 8000cm³

Time taken to drain off  = 1hr

Unknown:

Flow rate  = ?

Solution:

Flow rate is the volume of fluid that passes per unit of time.

 Flow rate  = \(\frac{volume of fluid}{time taken}\)  

 Flow rate  = \(\frac{8000cm^{3} }{1hr}\)  

Flow rate  = 8000cm³/hr

This produces a uniform magnetic field inside the solenoid, which is useful in a variety of applications, such as in electromagnets, MRI machines, and particle accelerators.

In a solenoid, the current flows along the length of the coil in the direction of the axis of the solenoid. This is typically referred to as the "longitudinal" direction.

The magnetic field produced by a solenoid is oriented in a specific direction, which depends on the direction of the current. The magnetic field lines form closed loops around the individual turns of the coil, and the direction of the magnetic field inside the solenoid can be determined using the "right-hand rule".

If you grasp the solenoid with your right hand such that your fingers curl in the direction of the current, then your thumb will point in the direction of the magnetic field inside the solenoid. In other words, the magnetic field inside the solenoid is oriented along the axis of the coil, in the same direction as the current flowing through the coil. This produces a uniform magnetic field inside the solenoid, which is useful in a variety of applications, such as in electromagnets, MRI machines, and particle accelerators.

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The magnitude of the impulse imparted to the golf ball can be determined using the impulse-momentum principle, which states that the impulse experienced by an object is equal to the change in momentum it undergoes.

The momentum of an object can be calculated by multiplying its mass by its velocity.

Given:

Mass of the golf ball (m) = 0.050 kg

Initial velocity of the golf ball (u) = 0 m/s (since it starts from rest)

Final velocity of the golf ball (v) = 70.0 m/s

The change in momentum (Δp) can be calculated as:

Δp = m * (v - u)

Substituting the given values:

Δp = 0.050 kg * (70.0 m/s - 0 m/s)

Δp = 0.050 kg * 70.0 m/s

Δp = 3.50 kg·m/s

Therefore, the magnitude of the impulse imparted to the golf ball is 3.50 kg·m/s.

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The magnitude of the impulse imparted to the golf ball is 3.5 N·s.

Impulse is defined as the change in momentum of an object. The magnitude of impulse can be calculated using the formula:

Impulse = Δp = m * Δv

Where:

Δp is the change in momentum,

m is the mass of the golf ball, and

Δv is the change in velocity.

Given:

Mass of the golf ball, m = 0.050 kg

Initial velocity, v₁ = 0 m/s (assuming the ball was at rest initially)

Final velocity, v₂ = 70.0 m/s

The change in velocity is Δv = v₂ - v₁ = 70.0 m/s - 0 m/s = 70.0 m/s.

Substituting the values into the formula, we get:

Impulse = m * Δv = 0.050 kg * 70.0 m/s = 3.5 N·s.

Therefore, the magnitude of the impulse imparted to the golf ball is 3.5 N·s.

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Answer:

Eelas = 5 [J]

Explanation:

Elastic energy is associated with the ability that has a spring or any other material with elastic properties.

We can calculate the elastic energy by means of the following equation:

\(E_{elas}=\frac{1}{2} *k*x^{2}\)

where:

k = constant spring = 2.5 [N/m]

x = distance stretched = 2 [m]

\(E_{elas}=\frac{1}{2} *2.5*(2)^{2}\\E_{elas}=5[J]\)