Find the angle, in degrees, of the slope of a hill that a 65 kg skier could coast down at a constant speed. μ
s
​
=0.14 and μ
k
​
=0.10 for the skies on wet snow.

Given :

A 2450 kg stunt airplane accelerates from 120 m/s to 162 m/s in 2.10 s.

If the airplane is putting out an average force of \(5.8810\times 10^4 \ N\).

To Find :

The average friction force exerted on the airplane by the air.

Solution :

Acceleration is given by :

\(a = \dfrac{162-120}{2.10}\ m/s^2\\\\a = 20 \ m/s^2\)

Now, force equation is given by :

\(F - F_{friction} = ma\\\\F_{friction} = F-ma\\\\F_{friction} = 58810 - (2450\times 20 )\\\\F_{friction} = 9810\ N\)

Therefore, frictional force exerted in the airplane by the air is 9810 N.

In most US states, drivers are required to stop when a school bus stops, except if it has a median divider, to allow children to cross the road safely.

These laws were established to minimize the likelihood of a child being struck by a motor vehicle while entering or exiting a school bus on a busy road. The majority of school buses are equipped with stop signals and flashing lights to inform drivers when to stop and when it is safe to proceed.

The law, however, varies by state. In some states, drivers must stop both ways, regardless of whether the bus is on the other side of the street or not. In most states, including Georgia, you must stop if you are behind the bus or on the same side of the street.

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Using solid sphere density, the diameter of the sphere is 29.98 cm.

We need to know about the density to solve this problem. Density is a unit that measures how dense an object is. Density can be measured by dividing mass by volume. It can be written as

ρ = m / V

where ρ is density, m is mass and V is volume

From the question above, we know that

ρ = 19.32 g/cm³

m = 273.13 kg = 273130 g

Find the volume of sphere

ρ = m / V

19.32 = 273130 / V

V = 273130 / 19.32

V = 14137.16 cm³

Find the diameter of sphere

V = 4/3 . π . r³

14137.16 = 4/3 . π . r³

r³ = 3373.64

r = 14.99 cm

d = 1/2 r

d = 2 . 14.99

d = 29.98 cm

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Answer:

D. All lunar eclipses reoccur.

Explanation:

Every Saros cycle (19 eclipse years)

Saro was described by Edmond Halley arround the year 1691, which is a period of 223 synodic which can be interepreted as "repitition" it is used by the scientist for eclipse prediction either for the sun or moon eclipse. It is 18years and 11days and some hours.

It should be noted that with this All lunar eclipses reoccur.

To go from point A to point B, you should aim your boat at an angle of approximately 24.42 degrees upstream.

When a boat is moving in a river, the combined effect of the boat's speed in still water and the river's flow affects its trajectory. To determine the angle at which the boat should be aimed, we can use the concept of vector addition.

Let's consider the velocity of the boat in still water as v = 3.50 m/s and the velocity of the river's flow as w = 1.90 m/s. Since the river flows in a certain direction, we can represent its velocity as a vector, pointing downstream. In this case, the boat's velocity vector would be the resultant of its velocity in still water and the river's velocity.

To find the angle at which the boat should be aimed, we need to calculate the angle between the resultant vector (velocity of the boat) and the direction of point B from point A. This angle can be found using trigonometry.

By applying vector addition, we can determine the resultant velocity vector as v + w. The magnitude of this resultant velocity can be found using the Pythagorean theorem:

resultant speed = \(\sqrt(v^2 + w^2)\)

              = \(\sqrt((3.50 m/s)^2 + (1.90 m/s)^2)\)

              ≈ 3.96 m/s

Now, let's calculate the angle using the inverse tangent function:

θ = arctan(w / v)

  = arctan(1.90 m/s / 3.50 m/s)

  ≈ 24.42 degrees

Therefore, to go from point A to point B, you should aim your boat at an angle of approximately 24.42 degrees upstream.

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Answer:

When Tyrell's hands get warm the particles in his hands are moving faster or more rapidly.

Explanation:

The detergent solution used for washing dishes must be at least 110°F (option c) to effectively remove grease and bacteria.

To properly clean dishes, it is important to use a detergent solution at a certain temperature. The minimum temperature requirement ensures that the detergent is effective in breaking down grease and removing bacteria from the dishes.

The temperature of 110°F is often recommended as it provides the ideal balance between effectiveness and safety. At this temperature, the detergent can effectively dissolve and remove oily residues, food particles, and germs from the dishes. It helps to break down and emulsify fats and oils, facilitating their removal during the washing process.

Using hotter water can enhance the cleaning process by improving the detergent's ability to dissolve and remove contaminants. However, it is essential to strike a balance to prevent potential risks such as scalding or damage to delicate items. Therefore, maintaining a minimum temperature of 110°F ensures efficient cleaning while minimizing safety concerns.

It's worth noting that specific dishwasher models or dishwashing guidelines may recommend slightly different temperature ranges. It is advisable to follow the manufacturer's instructions or consult the dishwasher manual for the most suitable temperature settings for optimal dishwashing results.

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\( \mathfrak{\huge{ \mathfrak{  \underline{ Answer }}}\:  ✓ }\)

We know, hot water has more energy than the cold water , so when cold water is added in the beaker then heat transfer occurs from hot water to cold water to balance the Energy, causing the drop of temperature from 70° C to 40° C.

Note : Heat transfers occurs from hotter object to cooler one.

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Answer:

The definition of a regular shape is that all the sides are equal and all the inside angles are equal. An irregular shape doesn't have equal sides or equal angles.

Explanation:

Hope this helps you

Crown me as brainliest:)

Answer:

3125 N

Explanation:

diameter /2 =radius

so r1 =14cm , r2 =35cm

f1/A1 =f2/A2.

f2 = f1 × A2 / A1

=500×1225 pi cm² / 96 pi cm²

f2 =3125N

The answer is weight increases

Answer:

Weight increases

Explanation:

The gravitational force increases as the size of an object increases. On the other hand, the strength of gravity is inversely related to the square of the distance between two objects

The following spectroscopy method does not involve the interaction of organic molecules with electromagnetic radiation:

Mass Spectrometry (MS): Mass spectrometry is a technique that analyzes the mass-to-charge ratio of ions. It does not directly involve the interaction of organic molecules with electromagnetic radiation. Instead, it involves the ionization of molecules and the measurement of their mass-to-charge ratios using magnetic and electric fields.

On the other hand, the following spectroscopy methods do involve the interaction of organic molecules with electromagnetic radiation: Ultraviolet-Visible Spectroscopy (UV-Vis): UV-Vis spectroscopy measures the absorption or transmission of ultraviolet and visible light by organic molecules.

Infrared Spectroscopy (IR): IR spectroscopy measures the absorption or emission of infrared light by organic molecules. It provides information about the molecular vibrations and functional groups present in the molecules.

Nuclear Magnetic Resonance Spectroscopy (NMR): NMR spectroscopy measures the absorption of radiofrequency radiation by atomic nuclei in organic molecules. It provides information about the molecular structure, connectivity, and environment of the nuclei.

It's important to note that different spectroscopy methods have their own applications and provide complementary information about organic molecules.

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Answer:

it's a

Explanation:

hope this helps!!!!!!

Answer:

Given,

speed(v)= 339m/s

frequency(f)=640Hz

Now,

we know,

speed(v)= frequency × wavelength

or, 339=640 ×wavelength

or, wavelength= 339/640

or, wavelength =0.5m.

Therefore, option (A ) is correct...

The property of a transverse wave that stays the same even as the wave's energy and other properties change is the wavelength.

The correct option to the given question is option a.

The wavelength is the distance between two successive points of the wave that are in phase. As the wave's energy and amplitude change, the distance between two successive points of the wave that are in phase remains the same.

This is because wavelength is determined by the frequency of the wave and the speed of propagation. The frequency of the wave is the number of cycles of the wave that occur in one second, while the speed of propagation is the rate at which the wave travels through a medium.

If the frequency of the wave and the speed of propagation remain the same, then the wavelength will also remain the same even as the wave's energy and other properties change. This property is known as the characteristic of the wave.The amplitude is the maximum displacement of a point on the wave from its rest position. The frequency is the number of cycles of the wave that occur in one second. The rest position is the position of the medium when it is not disturbed.

Hence, wavelength of a transverse wave remains same even as the wave's energy and other properties change.

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Answer:

The correct answer is D)

Explanation:

When an electric magnet is brought near a cord with an electric current, the cord will most likely deflect away from the magnet because electric fields flowing through a wire generates its own magnetic field.

Cheers!

15 degrees because a glass of water won't do anything to a bath tub of 15 degree water

Answer:

What we see in the sky

Where are they in the general context of the overview of the Universe?

With the naked eye, the main astronomical objects we can see are the Sun, the Moon, the stars, and some of the planets

All of the stars we see are in the Milky Way galaxy, most of them relatively close to the Sun.

The stars we see in the sky come in a range of brightnesses, partly because stars come in different intrinsic brightnesses, and partly because some are closer than others.

When we look at an astronomical object ``by eye'', we can't tell just by looking how far away it is (because not all objects have the same intrinsic brightness). All we can see is what direction it is in.

As a result, when looking ``by eye'', the positions of stars on the sky are described by their direction only; you can imagine that the sky is a big sphere with astronomical objects located at different positions on it. This is called the celestial sphere

The positions of the stars can be described with a sort of astronomical longitude and latitude, called right ascension and declination.

Constellations are patterns of stars seen in the sky. However, although the stars in any constellation are all in the same general direction in the sky, the different stars in a constellation may be at very different distances from Earth, hence constellations may not be real associations of stars in space, just stars in the same general direction as seen from Earth.

Only the nearest galaxies are visible to the naked eye, as relatively faint smudges of light, although two of the very nearest galaxies, the Magellanic Clouds, are visible are moderately large clouds from the Southern hemisphere.

Motions in the sky

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As we know that there are two types of planets in our solar system, the terrestrial and jovian planets. Terrestrial planets are the planets that are made up of rock or metal and are much denser and smaller than the jovian planets.

The jovian planets are the planets that are made up of gases and are much larger and less dense than the terrestrial planets. Now let's talk about the number of moons each planet has. Each of the six terrestrial planets has at least five moons, while the jovian planets have no moons at all.

The planets of the solar system have been classified into two categories. The first type of planets is the terrestrial planets, also known as rocky planets, and the second type is the jovian planets, also known as gas giants. The terrestrial planets are smaller, denser, and composed mostly of rock and metal. On the other hand, the jovian planets are larger, less dense, and mostly composed of gases such as hydrogen and helium. As per the given question, a solar system has six terrestrial planets and four jovian planets.

Each of the six terrestrial planets has at least five moons, while the jovian planets have no moons at all.This implies that the terrestrial planets are much more likely to have moons than the jovian planets. It is because the gravitational pull of a planet depends on its size and mass. A smaller planet will have less gravitational pull, which means it can easily capture and hold onto a moon in its orbit. In contrast, a larger planet will have a stronger gravitational pull, which can cause it to lose moons or not capture any at all. Therefore, the terrestrial planets can hold onto moons better than the jovian planets.

The number of moons a planet can have depends on its size, mass, and gravitational pull. The terrestrial planets in our solar system have a higher likelihood of having moons because they are smaller, denser, and have less gravitational pull than the jovian planets. The jovian planets have no moons at all because they are larger, less dense, and have a stronger gravitational pull that can cause them to lose moons.

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Sam (85 kg) takes off up a 50-m-high, 10 degree frictionless slope on his jet-powered skis. The skis have a thrust of 220 N. He keeps his skis tilted at 10 degree after becoming airborne. Sam lands about 109.9 meters from the base of the cliff.

To solve this problem, we can use the conservation of energy principle. At the bottom of the slope, all of Sam's energy is in the form of potential energy:

Potential energy = mgh

where m is Sam's mass (85 kg), g is the acceleration due to gravity \((9.81 m/s^2)\), and h is the height of the slope (50 m).

Potential energy = \((85 kg) \times (9.81 m/s^2) \times (50 m) = 41,287.5 J\)

As Sam takes off up the slope, his potential energy is converted to kinetic energy and then to a combination of kinetic and potential energy as he becomes airborne. We can use the conservation of energy to find Sam's speed at the top of the slope:

Potential energy at bottom = Kinetic energy at top

\(mgh = (1/2)mv^2\)

where v is Sam's speed at the top of the slope.

\(v = \sqrt{(2gh)} = \sqrt{(2 \times 9.81 m/s^2 \times 50 m)} = 31.3 m/s\)

Now, we can use Sam's speed and the angle of his skis to find his horizontal velocity:

Horizontal velocity = v cos(theta)

where theta is the angle of the skis after becoming airborne (10 degrees).

Horizontal velocity = 31.3 m/s x cos(10 degrees) = 30.2 m/s

Finally, we can use the horizontal velocity and Sam's hang time to find the distance he travels:

Distance = Horizontal velocity x Hang time

where hang time is the time Sam spends in the air. Hang time can be found using the formula:

Hang time = (2v sin(theta)) / g

Hang time = (2 x 31.3 m/s x sin(10 degrees)) / 9.81 \(m/s^2\) = 3.64 s

Distance = 30.2 m/s x 3.64 s = 109.9 m

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Answer:

A. Commutator

Explanation:

Commutator is part of a motor causes its electromagnet to turn in the same direction consistently, transforming electrical energy into mechanical energy.

Energy is the ability or capability to do tasks, such as the ability to move an item (of a certain mass) by exerting force. Energy can exist in many different forms, including electrical, mechanical, chemical, thermal, or nuclear, and it can change its form.

A commutator is a rotary electrical switch in certain types of electric motors and electrical generators.

Commutator is part of a motor causes its electromagnet to turn in the same direction consistently, transforming electrical energy into mechanical energy.

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Yes - Momentum is a vector quantity because it possesses both magnitude and direction

Ultra = X-ray

Explanation:

how are things going to paint the roof for beginners painting and decorating the whole house so I'm going away with a few sports mates for a couple nights for beginners but will have a look painting at a time and see what is going to be Strong enough

Answer:

 Newton's third law of motion: Your body exerts a downward force on the chair and the chair exerts an upward force on your body.

Explanation:

Explanation:

We need to find the quantum state of a particle can be specified by giving a complete set of quantum numbers (n,l, ml,ms).

We have the principal quantum number, n = 3

The value of l = n-1

l = 0,1,2,3

The value of \(m_l\)

\(m_l=-l\ \text{to}\ +l\\\\m_l=-3,-2,-1,0,1,2,3\)

The value of \(m_s\)

\(m_s=\dfrac{-1}{2},\dfrac{+1}{2}\)

Hence, this is the required solution.

After calculating, you will find the required magnetic field strength for your cyclotron project.
B = m/(q*r*v)
Where B is the magnetic field strength, m is the mass of the proton, q is the charge of the proton, r is the radius of the vacuum chamber, and v is the velocity of the proton.
First, let's calculate the mass and charge of the proton. The mass of the proton is approximately 1.67 x 10^-27 kg, and the charge is 1.6 x 10^-19 C.

Next, we need to find the velocity of the proton. You stated that you would like to accelerate the protons to 0.99c, or 99% of the speed of light. The speed of light is approximately 3 x 10^8 m/s, so 0.99c is approximately 2.97 x 10^8 m/s.
Now, we can plug in our values and solve for B:
B = (1.67 x 10^-27 kg)/(1.6 x 10^-19 C * (150/2) * 2.97 x 10^8 m/s)
The diameter of the vacuum chamber is given as 150, so we need to divide it by 2 to get the radius (r).
Simplifying this equation, we get:
B = 0.312 T
Therefore, you will need a magnetic field strength of approximately 0.312 T to accelerate protons to 99% of the speed of light in a vacuum chamber with a diameter of 150.

The magnetic field strength (B) required for the cyclotron. To achieve this, use the cyclotron equation:
B = (2 * π * m * v) / (q * r)
where:
- m is the mass of the proton (1.67 × 10^-27 kg)
- v is the speed of the protons (0.5 × speed of light = 0.5 × 3 × 10^8 m/s)
- q is the charge of the proton (1.6 × 10^-19 C)
- r is the radius of the vacuum chamber (half of the diameter)
Given a diameter of 150 meters, the radius (r) will be 75 meters. Plug the values into the equation and solve for B:
B = (2 * π * 1.67 × 10^-27 kg * 1.5 × 10^8 m/s) / (1.6 × 10^-19 C * 75 m)

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The specific heat capacity of the unknown liquid is approximately -175 J/kg-K. Note that the negative sign indicates that the liquid is losing heat.

To find the specific heat capacity of the unknown liquid, we can use the principle of conservation of energy.

First, let's calculate the heat gained by the ice:

Q_ice = m_ice * c_ice * ΔT_ice

Where:

m_ice = mass of ice = 0.0270 kg

c_ice = specific heat capacity of ice = 2.09 × 10^3 J/kg-K

ΔT_ice = change in temperature of ice = 14.0°C - 0.0°C = 14.0 K

Q_ice = 0.0270 kg * 2.09 × 10^3 J/kg-K * 14.0 K

Q_ice = 785.04 J

Next, let's calculate the heat lost by the liquid:

Q_liquid = m_liquid * c_liquid * ΔT_liquid

Where:

m_liquid = mass of liquid = 0.280 kg

c_liquid = specific heat capacity of the unknown liquid (to be determined)

ΔT_liquid = change in temperature of the liquid = 14.0°C - 30.0°C = -16.0 K

Q_liquid = 0.280 kg * c_liquid * (-16.0 K)

Q_liquid = -4.48 * c_liquid

Since there is no heat exchange with the surroundings, the heat gained by the ice is equal to the heat lost by the liquid:

785.04 J = -4.48 * c_liquid

Solving for c_liquid:

c_liquid = 785.04 J / (-4.48)

c_liquid ≈ -175 J/kg-K

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Answer:

b. 0.6m/s, 0.7m/s, 0.61m/s, 0.62m/s

Explanation:

Precision of a measurement is the closeness of the experimental values to one another. Hence, experimental measurements are said to be precise if they are close to each other irrespective of how close they are to the accepted value. Precision can be determined by finding the range of each experimental value. The measurement with the LOWEST RANGE represents the MOST PRECISE.

Note: Range is the highest value - lowest value

Set A: 1.5 - 0.8 = 0.7

Set B: 0.7 - 0.6 = 0.1

Set C: 2.4 - 2.0 = 0.4

Set D: 3.1 - 2.9 = 0.2

Set B has the lowest range (0.1), hence, represent the most precise value.

As charge flows, the chemical energy of the battery is dissipated as the time of charge flow increases.

Electric power is defined as the rate at which electric energy is dissipated.

The power of the current flowing through the circuit is calculated as follows;

P = IV

P = I x IR

P = I²R

where;

The electric energy is given as;

E = Pt

E = I²Rt

Thus, we can conclude that as charge flows, the chemical energy of the battery is dissipated as the time of charge flow increases.

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