At highway speeds, a particular car is capable of an acceleration of about 1.6 m/s?. At this rate,
does it take the car to speed up from 80 km/hr to 110 km/hr? Round your answer to
Two significant figures

Answer:

Explanation: The answer is 87.5 km per hour

Answer: 87.5 Km average speed per hour

Explanation:

350 / 4 = 87.5

In ptolemy's system the planets orbit the earth and not the sun ,  the system explain the retrograde motion of planets like jupiter as planets move on two sets of circles, a deferent and an epicycle. It held that the planets moved along small circles that moved on larger circles around Earth, and that the combined motion sometimes resulted in backward motion.

Retrograde motion, in astronomy, actual or apparent motion of a body in a direction opposite to that of the (direct) motions of most members of the solar system or of other astronomical systems with a preferred direction of motion.

Retrograde motion is an apparent change in the movement of the planet through the sky. It is not real in that the planet does not physically start moving backwards in its orbit. It just appears to do so because of the relative positions of the planet and Earth and how they are moving around the Sun.

Claudius Ptolemy , argued that planets move on two sets of circles, a deferent and an epicycle. This explained retrograde motion while keeping the planets in their circular orbits around the Earth.

It held that the planets moved along small circles that moved on larger circles around Earth, and that the combined motion sometimes resulted in backward motion.

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A good candidate to use a method to find distance would be any variable star. The correct option is C.

Intrinsic radiance is the brightness of a star if it were not dimmed by distance or intervening gas or dust. In contrast to apparent brightness, which is measured at a distance.

The luminosity of a star is a measurement of the energy emitted by it (in the form of light) per unit time. Because this value is independent of distance, astronomers use it to calculate the intrinsic brightness of a star.

The magnitude of a star increases with its proximity to us. That is, a star's apparent magnitude is its magnitude as measured from Earth.

Thus, the correct option is C.

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Your question seems incomplete, the probable complete question is attached below:

Using first order perturbation theory the correction to the ground state energy of the hydrogen atom is -13.6 eV. The perturbation is V^(r) = ϕ(r) - V^0(r)

To determine the correction to the ground state energy of the hydrogen atom using first-order perturbation theory, we need to calculate the perturbation V^ and then use it to compute the energy correction.

The perturbation V^ arises from the difference between the actual potential ϕ(r) and the potential due to a point-like proton, which is the potential used in the Hamiltonian H^0 of the hydrogen atom. Therefore, we have:

V^(r) = ϕ(r) - V^0(r)

where V^0(r) is the potential due to a point-like proton, given by:

V^0(r) = - Q/(4πϵ_0 r)

Note that the negative sign comes from the fact that the proton has a positive charge.

Now, let's substitute the expression for ϕ(r) in the equation for V^(r) and simplify:

V^(r) = { Q/(8πϵ_0 R) } ( 3 - r^2/R^2 ) for r ≤ R

V^(r) = - { Q/(4πϵ_0 r) } for r > R

The first expression applies for distances r less than or equal to the radius R of the homogeneous charge distribution, while the second expression applies for distances greater than R.

To calculate the energy correction, we need to evaluate the expectation value of V^ with respect to the ground state wave function ψ_1s of the hydrogen atom, which we assume to be known:

ΔE = ⟨ψ_1s| V^ |ψ_1s⟩

Using the radial part of the 1s wave function, which depends only on the distance r from the proton, we can write:

ΔE = 4π ∫_0^∞ r^2 ψ_1s(r) V^(r) ψ_1s(r) dr

The integral limits cover the entire range of possible distances from the proton.

To evaluate this integral, we need to use the expression for the 1s wave function of the hydrogen atom, which is:

ψ_1s(r) = (1/πa^3)^(1/2) e^(-r/a)

where a is the Bohr radius.

Substituting this into the expression for ΔE and performing the integral, we obtain:

ΔE = { Q^2 a^3 / (2 πϵ_0 R^3) } [ 1 - (15/4) (a/R)^2 ]

Note that the correction is proportional to Q^2, the square of the proton charge, and inversely proportional to R^3, the cube of the radius of the charge distribution. This makes sense, as a larger charge or a smaller radius of the distribution should result in a larger perturbation.

Finally, substituting the values for Q and R, we obtain:

ΔE = 5.6 x 10^-22 eV

This correction is very small compared to the ground state energy of the hydrogen atom, which is -13.6 eV. However, it is still measurable in experiments and is an important correction to take into account in some contexts.

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To make 4 amperes flow through a resistance of 20 ohms, 80 volts of voltage are required.

Ohm's law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them. In other words, the greater the voltage, the greater the current that flows through a given resistance.

The voltage required to make 4 amperes flow through a resistance of 20 ohms can be calculated using Ohm's law:

Voltage (V) = Current (I) x Resistance (R)

Therefore, V = 4 A x 20 Ω = 80 V

So, to make 4 amps flow through a resistance of 20 ohms, 80 volts of electricity are required.

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An earthen wire is a metal sheet of woven wire or other similar device with reguarly spaced openings of uniform size, mounted in a  frame and use in spreading earthen material according to size.

Answer:

An earthing wire is, A wire that provides an electrical connection to the ground.

Explanation:

Answer:

V = 0.87 volt

Explanation:

Given that,

Charge, \(q=7.3\times 10^{-17}\ C\)

Electric potential energy, \(U=6.4\times 10^{-17}\ J\)

We need to find the value of electric potential at a point. The relation is as follows :

\(V=\dfrac{U}{q}\)

Where

V is electric potential

So,

\(V=\dfrac{6.4\times 10^{-17}}{7.3\times 10^{-17}}\\\\V=0.87\ V\)

So, the value of the electric potential at a point is equal to 0.87 Volts.

The outside diameter or side dimension of the vibrating element must be at least 19 mm but not greater than 38 mm is true. A vibration sensor is a system that is used to identify the condition of machinery and prevent it from being harmed. It keeps track of vibrations in the machinery and sends an alert if it exceeds a set threshold.

A sensor that detects vibrations in the environment or within a physical structure is known as a vibration sensor. Vibration sensors are commonly utilized in the maintenance of rotating equipment like pumps, motors, and other machinery to predict failure before it happens.

Based on the vibration being observed, these sensors may detect a range of defects, from unbalance and misalignment to bearing wear and looseness.

The outside diameter or side dimension of the vibrating element must be at least 19 mm but not greater than 38 mm. Hence, the given statement is true. This size range is important for the sensor to be able to pick up on the machinery's small vibrations and changes.

Anything smaller than 19 mm will not detect vibrations with the same precision, and anything larger than 38 mm will be more difficult to install in tight locations.

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Answer:

Work done = 838470 Joules.

Explanation:

Given the following data;

Power = 19 hp

Time = 1 minute to seconds = 60 seconds.

Next, we would convert the unit of power in "hp" to "Watt."

1 Watt = 0.00135962 horsepower

x Watt = 19 horsepower

Cross-multiplying, we have;

19 = 0.00135962x

x = 19/0.00135962

x = 13974.5 Watts.

Now, to find the work done in moving the mower;

Work done = power * time

Substituting into the formula, we have;

Work done = 13974.5 * 60

Work done = 838470 Joules.

Explanation:

The energy of a photon is given by :

\(E=\dfrac{hc}{\lambda}\)

Where

h is Planck's constant

c is the speed of light

\(\lambda\) is wavelength

or

\(E=hf\), f is the frequency

Energy is directly proportional to the frequency of an object.

The energy transported by a wave is directly proportional to the square of the amplitude.

The light year is defined as the amount of distance travelled by the light in one year.

When we talk about very large units of distance we come across the word light year.

Let us say that we took a light source and we allowed the light coming out from it to move in a straight direction. Now the amount of distance that this light will cover in the duration of one year called as the light year.

Light year is a very very large unit of measuring the distances this is why it is only used when we talk about astronomical objects like the distance between sun and earth or the distance between sun and moon at 17.

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Answer:

3.91 s

Explanation:

From the question,

The height of the helicopter is given as

h = 3t²......................... Equation 1

After 5 seconds, The height of the helicopter is given as

h = 3(5²)

h = 3×25

h = 75 m.

Note: The small mailbag falls under gravity.

Hence,

h = ut + 1/2(gt²)....................... Equation 2

Where u = initial velocity of the mailbag, t = time, h = height, g = acceleration due to gravity of the mail bag.

Given: h = 75 m, u = 0 m/s ( at the maximum height).

Constant: g = 9.8 m/s²

Substitute these values into equation 2

75 = 0(t) +1/2(9.8t²)

solve for t

1/2(9.8t²) = 75

4.9t² = 75

t² = 75/4.9

t² = 15.31

t = \(\sqrt{15.31}\)

t = 3.91 s

Answer:

Acceleration due to Gravity:

Explanation:

Here g is acceleration due to gravity. So C. 3.8 m/s2

Answer: The speed of the object traveling should be met with the opposite reaction, thus making something like a basketball bounce as high as the force applied to the ball, making both surfaces push off each other until kinetic energy ( form of energy that an object or a particle has by reason of its motion) is lost.

In corrosion fatigue is: "d) the surface remains bright after fracture."

Corrosion fatigue is a phenomenon that occurs when a material is subjected to cyclic loading in a corrosive environment, leading to the degradation of the material. During corrosion fatigue, the surface of the material can exhibit various changes and characteristics.

Option d) states that "the surface remains bright after fracture." This statement is incorrect. In corrosion fatigue, the surface of the material does not remain bright after fracture. Instead, it often exhibits characteristic signs of corrosion, such as pitting, cracking, or discoloration. The combination of cyclic loading and the corrosive environment leads to the formation and propagation of cracks, which ultimately results in failure.

The other options mentioned in the question (a, b, c) are also incorrect or irrelevant to corrosion fatigue. The number of cycles for failure does not necessarily increase as the stress is increased (option a). The effect of environmental factors and mechanical factors can vary depending on the specific situation (option b). The endurance limit of a material is not sharply reduced in corrosion fatigue (option c).

Therefore, the correct statement is option - d.

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Answer:

Explanation:

The average speed of an object can be found by using the formula

\(v = \frac{d}{t} \\ \)

d is the distance

t is the time taken

We have

\(v = \frac{3400}{20} = \frac{340}{2} \\ \)

We have the final answer as

Hope this helps you

The area of the planet with the highest specific humidity varies based on the season. The correct option is (C) it varies based on season.

Specific humidity refers to the actual amount of moisture present in the air, usually measured in grams of water vapor per kilogram of air. The specific humidity is influenced by various factors such as temperature, air pressure, and geographical location.

The highest specific humidity on the planet is not fixed and varies based on seasons. The specific humidity tends to be higher in areas where warm and moist air masses converge. During different seasons, these convergence zones shift due to the Earth's tilt and the resulting changes in solar radiation.

In general, areas near the equator experience high specific humidity due to the warm and moist tropical air masses. However, during certain seasons, specific humidity can also be high in other regions such as the poles, where there may be increased moisture content due to melting ice or seasonal patterns.

Therefore, the area of the planet with the highest specific humidity is not static and can change based on the season and specific climatic conditions.

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The currents through the 8 ω resistor at the instant that the switch is closed is 0.744 A.

Thus, In a full electrical circuit, current is the rate at which electrons move past a certain point. Current = flow, at its most fundamental level.

The international unit for measuring current is an ampere (AM-pir), sometimes known as an amp. It describes how many electrons (sometimes referred to as "electrical charge") travel past a certain point in a circuit over a specified period of time.

In a circuit, a current of 1 ampere corresponds to the movement of 1 coulomb of electrons, or 6.24 billion billion (6.24 x 1018) electrons, past a single location in 1 second and current. The currents through the 8 ω resistor at the instant that the switch is 0.744 A.

Thus, The currents through the 8 ω resistor at the instant that the switch is closed is 0.744 A.

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Option D is the correct answer. The hot disks observed around young stars provide strong evidence for the solar nebula theory, which is widely accepted as the best explanation for the origin of our own solar system and others like it.

The observation that seems to suggest the solar nebula theory is correct is that young stars are found to have hot disks that surround them. These disks are thought to be the remnants of the protoplanetary disk from which the planets in our own solar system formed. The disks are observed at infrared wavelengths, indicating that they are warm and radiating heat. This observation is consistent with the idea that the solar system formed from a spinning cloud of gas and dust that collapsed under its own gravity, forming a protostar at the center and a surrounding disk. As the protostar continued to accrete material from the disk, planets formed in the disk by accretion and gravitational interactions. This is the solar nebula theory in a nutshell. Therefore, option D is the correct answer. The hot disks observed around young stars provide strong evidence for the solar nebula theory, which is widely accepted as the best explanation for the origin of our own solar system and others like it.

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Answer:

649 N

Explanation:

W = force X distance

2920 = force * 4.5

2920/4.5 = force = 649 N

The maximum speed she can tolerate at the low point of her swing is 10.78 m/s.

Given that,

Mass of the carpenter = 61.7 kg

Length of the rope = 11.5 m

Capable force = 1229 N

Centripetal force acting on the body, F = mv²/r = 61.7* v²/11.5 = 5.37 v²

Gravitational force acting on her is

F = mg = 61.7* 9.81 = 605.28 N

Equating the summation of centripetal force and gravitational force with total capable force,

5.37 v² + 605.28 = 1229

5.37 v² = 623.72

v² = 116.15

v = 10.78 m/s

Thus, the maximum speed she can tolerate at the low point of her swing is 10.78 m/s.

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The value that completes the box plot distribution of wind speed statement is 48 km/h.

To determine the value that completes the statement, locate the median, which represents the 50th percentile. From the plot, the median (50th percentile) is at approximately 42 km/h.

The box extends from the first quartile (25th percentile) to the third quartile (75th percentile), so determine the range of speeds that contains 50% of the measurements by finding the difference between the median and the first quartile, and then adding it to the median.

The plot estimates that the difference between the median and the first quartile is approximately 6 km/h. Therefore, 50% of the speeds are between 36 km/h and (42 + 6) km/h, which simplifies to 36 km/h and 48 km/h.

So the value that completes the statement is 48 km/h.

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Answer: For example you can tell that metal are metal because of their luster (shine) and their hardness. There are other ways to classify objects by physical properties

- Chilio

The hydrostatic force against one side of the triangular plate can be expressed as an integral.

Let's denote the depth of the plate below the surface of the water as h and the weight density of water as ρ.

The hydrostatic force can be calculated using the formula:

F = ∫(ρgh)dy,

where h is a function of y, the vertical position along the side of the plate.

In this case, the triangular plate has a height of 4 ft, and the top is 2 ft below the surface of the water. Since the plate is submerged vertically, the depth h can be expressed as h = 2 + y. The limits of integration will be from y = 0 to y = 4, corresponding to the full height of the plate.

Substituting the value of h into the integral, we have:

F = ∫(ρg(2 + y))dy.

Now we need to evaluate this integral using the given weight density of water (ρ = 62.5 lb/ft^3) and the acceleration due to gravity (g = 32.2 ft/s^2).

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The heat loss is 173.17 W.  The temperature at the interface between the metal and the insulation is 727 K.

Given data:

Diameter of the inner wall of the tube = ID = 0.0254 m

Diameter of the outer wall of the tube = OD = 0.0508 m

Thermal conductivity of stainless steel tube = a = 21.63 W/m-K

Thickness of the insulation layer = B = 0.0254 m

Thermal conductivity of the insulation material = k = 0.2423 W/m-K

Temperature of the inside wall of the tube = Ti = 811 K

Temperature of the outside wall of the insulation = To = 310.8 K

Length of the pipe = L = 0.305 m

Calculate the heat loss:

Heat loss can be calculated using the formula,

Q = ((Ti - To) / ((1/a) ln(OD/ID) + B/k)) * (2πL)Q = ((811 - 310.8) / ((1/21.63) ln(0.0508/0.0254) + 0.0254/0.2423)) * (2π × 0.305)Q = 173.17 W

Therefore, the heat loss is 173.17 W.

Calculate the temperature at the interface between the metal and the insulation:

Temperature at the interface can be calculated using the formula,

Q = ((Ti - Tint) / (1/a + B/k)) * (2πL)The value of Q is already known as 173.17 W.

Tint = Ti - Q / (2πL) * (1/a + B/k)Tint = 811 - 173.17 / (2π × 0.305) * (1/21.63 + 0.0254/0.2423)Tint = 727 K

Therefore, the temperature at the interface between the metal and the insulation is 727 K.

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Answer:

larger

Explanation:

just trust me

The smaller the mass of an object, the smaller its inertia, because the inertia of any object is directly proportional to the mass of the object

The ability of an object to resist changes in motion is known as inertia. The amount of inertia is directly related to an object's mass; in fact, as we frequently observe, the heavier an object is, the harder it is to change its direction of motion.

A straightforward illustration: While it is relatively simple to stop a tennis ball that has been thrown in our direction, we are aware that it is more difficult to stop a large truck that is moving in the same direction at the same speed. This is because the truck has a much higher mass than the tennis ball and a higher moment of inertia. As a result, inertia rises as mass does.

Since the inertia of any object is directly proportional to its mass, the smaller its mass, the less inertia it will have.

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The answer to the question, "What is something that you use almost every day that is a polymer?" is:D) plastic
Plastic is the most common example of a polymer that we use daily in various forms, such as bags, bottles, and containers.

Polymers are materials made up of repeating units or monomers, and plastic is one of the most common types of polymers used in everyday life. Plastic can be found in items such as water bottles, food containers, and packaging materials. It is a versatile material that can be molded into various shapes and forms, making it a popular choice for many applications.

Plastic is a polymer, which means it's composed of long chains of molecules. Other options are incorrect because:

A) Metal is not a polymer; it's an element or an alloy of different elements.
B) Gas is a state of matter and not a polymer.
C) Water is a compound  and not a polymer.
E) Wood is a natural material mainly composed of cellulose, which is a natural polymer, but it is not a primary example of a polymer when compared to plastic.

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The wavelength corresponding to photons with a frequency of 1.039x1015 s-1 is approximately 289.44 nm.

To find the wavelength corresponding to a given frequency, we can use the formula: wavelength = speed of light/frequency. The speed of light is approximately 3x10^8 m/s. We need to convert the frequency from s-1 to Hz, so 1.039x10^15 s-1 is equivalent to 1.039x10^15 Hz.

Plugging these values into the formula, we have wavelength = (3x10^8 m/s) / (1.039x10^15 Hz). Simplifying the expression, we find the wavelength to be approximately 2.89x10^-7 m. To convert this value to nanometers (nm), we multiply by 10^9, resulting in approximately 289.44 nm.

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