The amount of matter in an object is mass or weight

Recall the formula of refractive index

\(\sf \mu =\dfrac{sini}{sinr}\)

As per the diagram

At AD angle of incidence i is

\(\\ \rm\Rrightarrow \gamma=sin^{-1}\left(\dfrac{1}{\dfrac{n_1}{n_2}}\right)\)

\(\\ \rm\Rrightarrow \gamma=sin^{-1}\left(\dfrac{n_2}{n_1}\right)\)

At AB's imaginary boundary line

Use snell's law

\(\\ \rm\Rrightarrow \dfrac{\mu_1}{\mu_2}=\dfrac{sin\alpha}{sin\beta}\)

\(\\ \rm\Rrightarrow \mu_1sin\alpha=\mu_2sin\beta\)

\(\\ \rm\Rrightarrow n_2sin\alpha=n_1sin\left(\dfrac{\pi}{2}-\gamma\right)\)

\(\\ \rm\Rrightarrow n_2sin\alpha=n_1cos\left(sin^{-1}\left(\dfrac{n_2}{n_1}\right)\right)\)

\(\\ \rm\Rrightarrow sin\alpha=\dfrac{n_1}{n_2}cos\left(sin^{-1}\dfrac{n_2}{n_1}\right)\)

\(\\ \rm\Rrightarrow \underline{\boxed{\bf{\alpha=sin^{-1}\left[\dfrac{n_1}{n_2}cos\left(sin^{-1}\dfrac{n_2}{n_1}\right)\right]}}}\)

Option A

It is certainly true that a warm engine is more fuel efficient than a cold one and it is because  the engine warms up to an efficient temperature faster than a cold one.

This is also referred to as motor and is known as a machine which is designed or set up to convert one or more forms or types of energy into mechanical energy.

In the case of a warm engine , there is usually more fuel efficiency than a cold one when compared which is because engine warms up to an efficient temperature faster thereby saving fuel in the vehicle or machine involved.

This is therefore the reason why it is often recommended that you let your car engine run idle to warm up before driving, especially on cold winter days thereby making it the correct choice.

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Answer:

hydrochlorine +12÷B to the power of 4 -× y reapeated zminus 2 to the power of 9

Answer:

Stupid

Explanation:

Because there is never a answer when we are trying to find one

(a) The theoretical pressure head is 9.90 m, and the actual pressure head is 7.70 m. (b) The blade outlet angle Bzy is approximately 22.40°.

(a) For the first scenario:

Given:

Rotating speed (n): 1450 rpm

Flow rate (Q): 0.0833 m^3/s

Outer diameter of impeller (D2): 360 mm

Inner diameter of impeller (D1): 138 mm

Blade outlet angle (B2y): 30°

Flow cross-sectional area at impeller outlet (A2): 0.023 m^2

Circulation coefficient (K): 0.7

Assuming Cu (blade outlet velocity coefficient): 0

To calculate the theoretical pressure head, we can use the following equation:

Ht = (Q * K) / (g * A2)

where Ht is the theoretical pressure head, Q is the flow rate, K is the circulation coefficient, g is the acceleration due to gravity (approximately 9.81 m/s^2), and A2 is the flow cross-sectional area at impeller outlet.

Plugging in the given values, we have:

Ht = (0.0833 * 0.7) / (9.81 * 0.023) = 9.90 m

To calculate the actual pressure head, we can use the following equation:

Ha = (Q * K) / (g * A2) - (Cu^2 / (2 * g))

Since Cu is assumed to be 0, the second term in the equation becomes 0.

Plugging in the values, we have:

Ha = (0.0833 * 0.7) / (9.81 * 0.023) = 7.70 m

(b) For the second scenario:

Given:

Outer diameter of impeller (Dz): 350 mm

Blade outlet width (b2): 12.7 mm

Rotating speed (n): 1200 rpm

Flow rate (Q): 1.27 m^3/min

Pressure difference at inlet and outlet: 272 kPa

Circulation coefficient (K): 0.9

Hydraulic efficiency (mn): 70%

Assuming Ciu (blade inlet velocity coefficient): 0

To calculate the blade outlet angle (Bzy), we can use the following equation:

Bzy = arcsin(2 * mn * Q) / (π * Dz * b2 * sqrt(2 * g * (p2 - p1)))

where Bzy is the blade outlet angle, mn is the hydraulic efficiency, Q is the flow rate, Dz is the outer diameter of the impeller, b2 is the blade outlet width, g is the acceleration due to gravity, and p2 - p1 is the pressure difference at the inlet and outlet.

Plugging in the given values, we have:

Bzy = arcsin((2 * 0.70 * 1.27) / (π * 350 * 12.7 * sqrt(2 * 9.81 * 272))) ≈ 22.40°

(a) The theoretical pressure head is 9.90 m, and the actual pressure head is 7.70 m in the first scenario.

(b) The blade outlet angle Bzy is approximately 22.40° in the second scenario.

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Answer:

B. the object will begin to move

Explanation:

If energy is transferred the object will definitely change so it CANNOT be "A". If you add energy the object will have more force so it CANNOT be "C". The mass of an object can't increase just by giving an object energy so it CANNOT be "D"

When energy is transferred to an object, the object is most likely to move either it gains a kinetic energy or it undergo a thermal vibration if thermal energy is applied.

Energy can be transferred from its high energetic area to less . All forms of energy can be transferred like this.For example, heat energy can be transferred through various modes such as conduction, convection, radiation etc.

When an object gain some energy its particles starts to vibrate and move apart. This makes the intermolecular force of attraction between molecules weaker than before and they tend to be more reactive.

The energy transferred to an object does not make any change in mass, or any of its innate properties or does not apply any force. Therefore, option B is correct.

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Answer:

You need to add a picture:)

To measure the temperature of frying oil, you should attach a high-temperature immersion probe to your thermocouple or thermistor.


1. Choose a high-temperature immersion probe: This type of probe is designed to withstand high temperatures and is suitable for measuring the temperature of hot liquids like frying oil.
2. Ensure compatibility: Make sure the immersion probe is compatible with your thermocouple or thermistor. Consult the manufacturer's specifications for guidance.
3. Attach the probe: Connect the immersion probe to your thermocouple or thermistor according to the device's instructions.
4. Insert the probe into the frying oil: Carefully immerse the tip of the probe into the hot oil, ensuring it does not touch the bottom or sides of the pan.
5. Monitor the temperature: Observe the temperature reading on your thermocouple or thermistor to ensure the oil is at the desired temperature for frying.
By following these steps, you'll be able to accurately measure the temperature of frying oil using a thermocouple or thermistor with a high-temperature immersion probe.

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Answer:

10km/h describe its velocity

Explanation:

Velocity =distance /time

It defined as the rate of change of the object's position with respect to a frame of reference and time.

If you travel a distance of 10 Km in 1 hour then 10 km/h is your velocity.

Velocity can be explained as a vector measurement of the direction and rate of motion of an object. The velocity of an object can be specified as the rate of change in the object’s position w.r.t. time.

Velocity can be defined as a vector parameter as it consists of both magnitude and direction. The velocity can be determined from the formula mentioned below:

v = d / t

where v is the velocity, d represents the distance covered, and t is the time.

Although the S.I. unit for the measurement of velocity is m/s or, miles per hour (mph), and kilometers per hour (kph).

Given, the distance traveled, d = 10  km

The time is taken, t = 1 hr

The velocity, v = d/t = 10 km/1 h = 10 km/h

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Answer:

Models are used to study atoms because we can never really see an atom up close, and a model is like a super magnified version of the atom. Plus, its easier to study from them because we can pin point the different characteristics of the atom (Protons, Neutrons, etc.)

Explanation:

Hope this helps! :>

Answer:

I believe its because the molecules are to small to see with the human eye and because the process would be very dangerous and somebody could get hurt.

Answer:

The speed of the comet at the surface of the star is approximately 1,208,694.7 m/s

Explanation:

Question parameter obtained online; The mass of the star, M = 5 × 10³¹ kg

Explanation;

The given mass of the comet, m = 2 × 10⁸ kg

The initial velocity of the comet, v → 0

The distance of the comet from the star, d = 700,000,000 km

The gravitational potential at d = G·M·m/d

The kinetic energy of the comet, K.E. = m·v²/2

The kinetic energy of the comet at d = m·(0)²/2 = 0

The gravitational potential at the surface of the star, R = G·M·m/R

The kinetic energy of the comet at the surface of the star, R = m·(v)²/2 = 0

Where;

M = The mass of the star = 5 × 10³¹ kg

\(M_{Sun}\) = The mass of the Sun = 1.989 × 10³⁰ kg

M/\(M_{Sun}\) = 5 × 10³¹/(1.989 × 10³⁰) ≈ 25

G = The universal gravitational constant = 6.67430 × 10⁻¹¹ N·m²/kg²

R = The radius of the star

Therefore, we have;

m·(0)²/2 - G·M·m/d = m·v²/2 - G·M·m/R

∴ v = √((G·M·m/R - G·M·m/d)×2/m) = √(2·G·M(1/R - 1/d))

Therefore; v = (2 × 6.67430 × 10⁻¹¹ × 5 × 10³¹ × (1/R - 1/700,000,000,000))

v = 81696389149.1×√(1/R - 1/700,000,000,000).

The speed of the comet at the surface of the star, v = 81696389149.1×√(1/R - 1/700,000,000,000)

The mass radius relationship is given as follows;

\(\dfrac{R}{R_{Sun}} = 1.30 \times \left(\dfrac{M}{M_{Sun}} \right)^{\dfrac{1}{2} }\)

\(R = R_{Sun} \times 1.30 \times \left(\dfrac{M}{M_{Sun}} \right)^{\dfrac{1}{2} }\)

The radius of the Sun = 696,340,000 M

∴ R ≈ 696,340,000 × 1.3 × √(25.14) = 4538865694.76

R = 4538865694.76 m

v = 81696389149.1×√(1/4538865694.76 - 1/700,000,000,000) ≈ 1208694.7  m/s

Answer:

9.8

Explanation:

distance=vt

1.40*7=distance

The force formula is defined by Newton's second law of motion: The force exerted by an object is equal to its mass x acceleration: F = m ⨉ a.

Using this formula, must use SI units. Newtons for force, kilograms for mass, and meters/second squared for acceleration. A force is a push or pull on an object caused by its interaction with another object. Whenever there is an interaction between two objects, there is a force acting on each object. When the interaction stops, the two objects no longer receive forces. A force is a push or pull that tends to change the rest or uniform motion of an object, or to change the direction or shape of an object. This will accelerate the object. The SI unit is Newton.

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Answer:

b. Red light is transmitted through and reflected by the glass

Explanation:

Give me brainliest plz!

All of the wavelengths of the red light are absorbed when it passes through a translucent red glass window, but the red light is transmitted and reflected.

Therefore, the correct answer is option b) Red light is transmitted through and reflected by the glass.

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A geostrophic flow is a type of motion in the atmosphere or ocean that is influenced by the Coriolis force and the pressure gradient force. The Coriolis force arises due to the rotation of the Earth and causes the fluids to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.

The pressure gradient force, on the other hand, is responsible for the movement of air or water from high pressure to low pressure regions. In a geostrophic flow, these two forces are balanced, resulting in a steady and straight flow along the contour lines of constant pressure.

The geostrophic flow is an important concept in meteorology and oceanography as it helps to explain the large-scale circulation patterns of the Earth's atmosphere and oceans. This type of flow can be observed in high-altitude winds, ocean currents, and weather systems such as hurricanes and cyclones. Understanding the dynamics of geostrophic flow is crucial for predicting weather patterns and studying the Earth's climate system.

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Answer:

Mechanical energy in Joules:

348,041,980

The total mechanical energy of the airplane is equal to 348,041,980 Joules.

Given the following data:

Scientific data:

To calculate the total mechanical energy of the airplane:

The total mechanical energy possessed by this airplane is equal to the sum of both the potential energy and kinetic energy at the given altitude.

Mathematically, the total mechanical energy is given by this formula:

\(E = \frac{1}{2}mv^2 + mgh\)

Substituting the given parameters into the formula, we have;

\(E = \frac{1}{2}\times 14300 \times 214^2 + 14300 \times 9.8 \times 147\\\\E=7150 \times 45796 + 20600580\\\\E= 327441400 + 20600580\)

E = 348,041,980 Joules.

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In a simple electrical circuit, if it contains a battery, a light bulb, and a properly connected ammeter, the ammeter has a very low internal resistance because it is connected in series with the circuit.

An electrical circuit is made up of a combination of resistors, voltage sources, and current sources that are interconnected in a closed loop. It is used to generate an electric current in a complete circuit and can be as straightforward as a battery connected to a bulb or as complicated as a full-scale electronic circuit.

Ammeters are measuring devices that are used to measure current in a circuit. The ammeter should be connected in series with the circuit to allow current to flow through it. An ammeter with a very low internal resistance should be used since any extra resistance in the ammeter can change the current being measured.

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Answer:

Explanation:

The work done by an object can be found by using the formula

From the question

force = 1,000 N

distance = 20 m

We have

workdone = 1000 × 20

We have the final answer as

Hope this helps you

Answer:

fortnite

Explanation: it is fortnite

Answer:

speed of the toy truck

Explanation:

The type of model of the universe in which many of the ancient Greeks believed that the earth was the stationary center of the universe is called geocentric model.

In this model, the Earth is considered to be at the center, with the Sun, Moon, planets, and stars orbiting around it. This geocentric view of the Universe was prevalent in ancient Greek cosmology and was also adopted by other civilizations, such as ancient Babylonian and medieval European societies. One of the most influential proponents of the geocentric model was the Greek philosopher Aristotle. It was not until the 16th century when the heliocentric model, with the Sun at the center of the Solar System, was proposed by astronomers such as Nicolaus Copernicus and later confirmed by observations and discoveries made by Galileo Galilei and others.

The question should be:

Many of the ancient Greeks believed that the Earth was the stationary center of the Universe. What type of model of the Universe is this?

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Among the compounds mentioned, sodium benzoate is the least water-soluble.

Water solubility refers to the ability of a substance to dissolve in water. The solubility of a compound depends on various factors, including its chemical structure and polarity. Comparing the compounds mentioned, benzoic acid is moderately soluble in water, while NaCl (sodium chloride) and HCl (hydrochloric acid) are highly soluble. On the other hand, sodium benzoate is the least water-soluble compound among them.

Sodium benzoate is the sodium salt of benzoic acid. The addition of a sodium ion to the benzoate molecule reduces its solubility in water compared to benzoic acid alone. This change in solubility can be attributed to the altered polarity and intermolecular interactions resulting from the presence of the sodium ion.

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Answer:

0.67 km

Explanation:

Given that,

The speed of a wave, v = 10 km/s = 10000 m/s

The frequency of a wave, f = 15 Hz

We need to find the wavelength of the wave. The speed of wave in terms of wavelength and frequency is given by :

\(v=f\lambda\\\\\lambda=\dfrac{v}{f}\\\\\lambda=\dfrac{10000}{15}\\\\=666.66\ m\)

or

= 0.67 km

So, the wavelength of the wave is 0.67 km.

Displacement of diver , d = 6000-1260 = 4740 m.

Let, time taken be t .

By equation of motion :

\(v^2-u^2=2gs\\\\v=\sqrt{2gs}\\\\v=\sqrt{2\times 9.8\times 4740}\ m/s\\\\v=304.8\ m/s\)

Now , by equation :

v = u +gt

304.8 = 0 + 9.8t

t = 31.1 seconds

Hence, this is the required solution.

Answer:

A

Explanation:

accel =  Δv /  Δ t  =  12/6 = 2 m/s^2

Answer:

the final volume of the gas is 1.923 L.

Explanation:

Given;

initial pressure, P₁ = 8.4 atm

initial volume of the gas, V₁ = 1.9 L

final pressure of the gas, P₂ = 8.3 atm

The final volume of the gas is calculated by applying Boyle's law as follows;

P₁V₁ = P₂V₂

V₂ = P₁V₁ / P₂

V₂ = (8.4 x 1.9) / 8.3

V₂ = 1.923 L

Therefore, the final volume of the gas is 1.923 L.

Answer:

  36 years

Explanation:

Given the equation of Kepler's third law as T² = a³, you want to know the period of an asteroid that has an orbital radius of 11 au.

Solving the given equation for t, we find ...

  T = a^(3/2) . . . . . . take the 1/2 power

Then for a=11, the period in years is ...

  T = 11^(3/2) ≈ 36.48

The period of the asteroid is about 36 years.

The speed of the object after 1 second and 2 seconds is 9.8 m/s and 19.6 m/s respectively.

The equation of motion to be used for calculation of velocity is -

v = u + at, where v and u are final and initial velocity, a is acceleration and t refers to time. Keep the value for each case to find the final velocity. The value of a will be acceleration due to gravity which is 9.8 m/s².

After 1 second

v = 0 + 9.8 × 1

v = 9.8 m/s.

After 2 seconds

v = 0 + 9.8 × 2

v = 19.6 m/s.

Hence, the required velocities are 9.8 and 19.6 m/s.

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