A pulse from a ruby laser (lambda = 694.3 nm) has an average power of 80 MW and lasts 4.2 ns. How many photons are emitted in this pulse? _____ photons

The sun is Yellow, red, orange, and blue. Therefore option B is correct.

The star is moving toward an observer. Therefore option B is correct.

39. The type of radioactive decay represented by the equation provided Gamma. Therefore option A is correct.

40. The statement is completed correctly by the information which states that the coal in Alberta has a lower carbon content than coal in other parts of Canada, resulting in reduced greenhouse gas emissions.

29. graph B depicts the relationship between gravitational field strength and the mass of the International Space Station orbiting Earth.

30. The correct sequence of colors representing the changing temperature from the surface to the atmosphere of the sun is Yellow, red, orange, and blue. Therefore option B is correct.

1. When a star undergoes a blue shift, it indicates that the star is moving toward an observer. Therefore option B is correct.

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Answer:

Reaction force. An object at rest on a surface experiences reaction force.

Tension. An object that is being stretched experiences a tension force.

Friction. Two objects sliding past each other experience friction forces.

Air resistance.

Explanation:

Answer with Explanation:

Conntact forces: Frictional force, Muscular force etc

Non-contact : gravitational, electrostatic, and magnetic

I hope   im right!!

Answer:

1080000

Explanation:

300 x 60s=18000m/minute

18000 x 60min=1080000m/h

Explanation:

So, your science teacher has given your class the classic "mousetrap car" assignment: to make, design, and build a small vehicle powered by the snapping action of a mousetrap to make your car travel as far as possible. If you want to come out ahead of all the other students in your class, you'll need to make your car as efficient as possible so you can squeeze every last inch out of your "car". With the right approach, it's possible to streamline your car's design for maximum distance using only common home materials. You could also buy a mousetrap car kit from any craft store and skip wondering if it will work.

Use large rear wheels. Large wheels have greater rotational inertia than small wheels. In practice, this means that once they start rolling, they're harder to stop rolling. This makes large wheels perfect for distance-based contests — theoretically, they'll accelerate less quickly than smaller wheels, but they'll roll much longer and they'll travel a greater distance overall. So, for maximum distance, make the wheels on the drive axle (the one the mousetrap is tied to, which is usually the rear one) very large. The front wheel is a little less important — it can be large or small. For a classic drag racer look, you'll want big wheels in the back and smaller ones in front.

Use thin, light wheels. Thinner wheels have less friction and may go farther if the distance is what you want or need with your mousetrap racer. It's also important to take the weight of the wheels themselves into account — any unneeded weight will ultimately slow your car down or lead to added friction. In addition, it's worth noting that wide wheels can even have a small negative effect on the car's drag due to air resistance. For these reasons, you'll want to use the thinnest, lightest wheels available for your car.

Old CDs or DVDs work fairly well for this purpose — they're large, thin, and extremely light. In this case, a plumbing washer may be used to reduce the hole size in the middle of the CD (to fit the axle better).

If you have access to old vinyl, these also work extremely well, though they may be too heavy for the smallest mousetraps.

Use a narrow rear axle. Assuming your car is a rear-wheel-drive car, each time your rear axle turns, the rear wheels turn. If your rear axle is extremely skinny, your mousetrap car will be able to turn it more times for the same length of string than it would if it were wider. This translates to turning your rear wheels more times, meaning greater distance! For this reason, it's a wise idea to make your axle out of the skinniest material available that can still support the weight of the frame and wheels.

Narrow wooden dowel rods are a great, easily-accessible choice here. If you have access to thin metal rods, these are even better — when lubricated, they usually have less friction.

Create traction by giving the edges of the friction of the wheels. If the wheels slip against the ground when the trap is sprung, energy is wasted — the mousetrap works to make the wheels turn, but you don't get any extra distance. If this happens with your car, adding a friction-inducing material to the rear wheels may reduce their slippage. To keep your weight requirements down, use only as much as is necessary to give the tips of the wheels some grip and no extra. Some suitable materials are:[1]

Electrical tape

Rubber bands

Additionally, placing a piece of sandpaper under the rear wheels at the start line can reduce slippage as the car begins to move (when it is most likely)

We need more 50 g of KNO3

Solubility is the ability of a substance to dissolve in a solvent (usually a liquid) to form a homogeneous solution. It is a property of a substance and can be defined as the maximum amount of a substance that can dissolve in a given amount of solvent at a specified temperature and pressure.

The solubility of the KNO3 at this temperature is 80 g/100 g water. If we have already 3og of the solute then we need an extra 50 g to make a saturated solution.

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Answer:

periscope, an optical instrument used in land and sea warfare, submarine navigation, and elsewhere to enable an observer to see his surroundings while remaining under cover, behind armor, or submerged.

Explanation:

The width of the slit is 0.212 mm.

The wavelength of light is defined as “The distance between the two successive crests or troughs of the light wave”.

We know that the distance between minima is given by :

                                       \(t = (m_{f} - m_{i} ) \alpha x/d\)

where, t = distance between minima

            \(\alpha =\) wavelength

            x = distance of screen

            d = width of slit

            \((m_{f} - m_{i} ) =\) difference between minima

Given, x = 40 cm = 0.4 m

           \(\alpha = 690 nm = 690 * 10^{-9} m\)

           t = 2.60 mm = \(2.60 * 10^{-3} m\)

           \((m_{f} - m_{i} ) =\) 3 -1 = 2

Putting these values in above equation we get d = 0.212 mm

So the width of the slit is 0.212 mm.

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The study of the macroscopic characteristics of materials is known as condensed matter physics.

It attempts to predict the collective behaviours of extremely large quantities of electrons, atoms, or molecules using the well-established rules of microscopic physics.

More unusual condensed phases include the Bose-Einstein condensate found in ultracold atomic systems, the ferromagnetic and antiferromagnetic phases of spins on crystal lattices of atoms, and the superconducting phase displayed by some materials at low temperatures. Condensed matter physicists use experiments to measure different material properties and mathematical models developed by using the physical laws of quantum mechanics, electromagnetism, statistical mechanics, and other theories to understand how these phases behave.

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The statement that must be true of an extended body experiencing a net force of zero is that the center of mass of the extended body is not accelerating.

When an extended body experiences a net force of zero, it means that the vector sum of all the forces acting on the body is zero. According to Newton's second law of motion, F = ma, where F is the net force, m is the mass, and a is the acceleration. Since the net force is zero, the acceleration of the body is also zero. In an extended body, different parts of the body may experience different forces, causing them to accelerate or decelerate. However, the center of mass of the body represents the point where the body's total mass is concentrated. If the net force is zero, the center of mass remains at rest or moves with a constant velocity, indicating that it is not accelerating.

Therefore, the correct statement is that the center of mass of the extended body is not accelerating.

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We will have that kinetic energy is different from potential energy as follows:

Kinetic energy is energy of a moving object, whereas potential energy is energy possessed by matter as a result of its location or structure. [Option C]

The function that is undefined when theta=pi/2 radians is the tangent function. To give a long answer and explain this, we need to understand the properties of the tangent function.

The tangent function is defined as the ratio of the opposite side to the adjacent side of a right triangle. When the angle theta is pi/2 radians, this means that the triangle is a 90-degree angle, and the adjacent side is equal to zero. Since division by zero is undefined, the tangent function is undefined at pi/2 radians.

The function that is undefined when theta = pi/2 radians is the tangent function, represented as tan(theta). This is because tan(theta) is equal to sin(theta)/cos(theta), and at pi/2 radians, cos(theta) equals zero. Since division by zero is undefined, the tangent function is undefined at theta = pi/2 radians.

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Answer:

D. Sound waves

Explanation:

The following options are missing:

A. radio wave

B. X-rays

C. Light waves

D. Sound waves

There are two kinds of waves: longitudinal and transverse.

In longitudinal waves, the vibrations are parallel to the direction of wave travel. Examples of longitudinal waves include: sound waves  and ultrasound waves.

In transverse waves, the vibrations are at right angles to the direction of wave travel. All electromagnetic waves (e.g. light waves, microwaves, radio waves and X-rays) are transverse waves.

The average velocity of the car is approximately 22 km/h.

To find the average velocity of the car, we need to calculate the displacement and divide it by the time taken.

The displacement is the straight-line distance between the initial and final positions of the car. Using the Pythagorean theorem, we can find the displacement:

displacement = √[(55.2 km)^2 + (22.7 km)^2]

displacement ≈ 59.4 km

The time taken is given as 2.7 hours.

Now, we can calculate the average velocity:

average velocity = displacement/time

average velocity = 59.4 km / 2.7 hours

average velocity ≈ 22 km/h (rounded to the nearest whole number)

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Answer:-

The terminal velocity of a steel ball 2 mm in diameter falling through glycerin is 44×10 - ²

cm/s (Given that specific gravity of steel = 8, specific gravity of steel =8, specific gravity of glycerin a 1.3, viscosity of glycerine 8.3 poise.) .

Chemical reactions involve the breaking and formation of chemical bonds between atoms and molecules. These reactions are influenced by factors such as temperature, concentration, and the presence of a catalyst. The rate constant of a chemical reaction is a measure of the reaction rate, which is defined as the change in concentration of a reactant or product per unit time. The rate constant is dependent on the temperature of the reaction system and is affected by the activation energy of the reaction.

In this scenario, the rate constant of the chemical reaction tripled when the temperature was raised from 24°C to 49°C. This change in the rate constant is related to the activation energy of the reaction. The activation energy is the minimum amount of energy required for a reaction to occur. It is determined by the Arrhenius equation, which relates the rate constant to the activation energy and temperature.

Using the Arrhenius equation, we can calculate the activation energy of the reaction as follows:

\(\frac{k_{2} }{k_{1}} = exp((\frac{Ea}{R} )(\frac{1}{T_{1}} -\frac{1}{T_{2}}))\)

where \(k_{1}\) and \(k_{2}\)  are the rate constants at temperatures \(T_{1}\)  and \(T_{2}\) , respectively; Ea is the activation energy of the reaction; R is the gas constant (8.314 J/mol.K).

Substituting the given values, we have:

\(\frac{k_{2} }{k_{1} }  = 3\)
T1 = 24 + 273 = 297 K
T2 = 49 + 273 = 322 K

Solving for Ea, we get:

Ea = \(\frac{(1.0986 × 8.314)}{\frac{1}{297}-\frac{1}{322}  }\)
Ea = 59.2 kJ/mol

Therefore, the activation energy of the chemical reaction is 59.2 kJ/mol.

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Without additional information, it is not possible to rank the stars according to size based solely on their apparent magnitude.

The apparent magnitude of a star refers to its brightness as observed from Earth. However, the apparent magnitude does not directly provide information about the size or physical dimensions of the star.

Therefore, without additional information about the stars' sizes or other properties, it is not possible to rank them according to size from largest to smallest based solely on their apparent magnitude.

Without additional information regarding the stars' sizes or physical properties, it is not possible to rank them according to size from largest to smallest solely based on their apparent magnitude.

Apparent magnitude is a measure of how bright a star appears from Earth, but it does not directly indicate the star's size. The size of a star is determined by its radius or diameter, which is not related to its apparent magnitude.

To determine the size of stars, additional measurements such as their luminosity, distance, or spectral type would be needed.

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The total entropy change during this process is, -16.4 J/°C.

To determine the total entropy change during this process, we need to consider both the entropy change of the iron block and the entropy change of the water in the tank. We can assume that the entire process is adiabatic (i.e., no heat transfer occurs between the system and the surroundings), so the total entropy change of the system is zero.

The entropy change of the iron block can be calculated as,

ΔS_iron = m × Cp_iron × ln(T_f / T_i)

where m is the mass of the iron block, Cp_iron is the specific heat capacity of iron, T_f is the final temperature of the iron block, and T_i is the initial temperature of the iron block.

Assuming that the final temperature of the iron block is the same as the temperature of the water in the tank (i.e., 18°C), we can calculate the entropy change of the iron block as,

ΔS_iron = 25 kg × 0.45 J/g°C × ln(18°C / 350°C)

≈ -16.4 J/°C

The entropy change of the water in the tank can be calculated as,

ΔS_water = m × Cp_water × ln(T_f / T_i)

where m is the mass of the water in the tank, Cp_water is the specific heat capacity of water, T_f is the final temperature of the water, and T_i is the initial temperature of the water.

Assuming that the iron block and the water reach a final temperature of 18°C, we can calculate the entropy change of the water as,

ΔS_water = 100 kg × 4.18 J/g°C × ln(18°C / 18°C)

= 0 J/°C

Therefore, the total entropy change during this process is,

ΔS_total = ΔS_iron + ΔS_water

≈ -16.4 J/°C + 0 J/°C

≈ -16.4 J/°C

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The answer Is kilometers

Answer:

Writing down your goals is motivating.

Writing your goals helps you be more specific.

Writing goals helps clarify what results you are working towards.

These are all true.

Explanation:

The benefits of writing goals are it motivates you and helps clarify what results you are working towards, writing your goals helps you be more specific so, options A, C, and E are correct.

A goal is a target or objective that someone is attempting to reach. The goal can also refer to the finish line of a race or the object that a player is attempting to insert as part of a game.

As a noun, "goal" has other meanings. An aim or objective is a goal if you work hard and persistently to achieve it. You may clarify what you want to accomplish in life by writing down your goals.

Your objectives become concrete and tangible, taking them out of your head. Setting goals in writing helps you to make your future clear. You won't know where you're going or what you want if you don't know what you want.

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The RMS current , Power and Maximum voltage have values 0 to 1 , V1/2 to 0 and infinity to zero.

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Answer: Planets would be pulled into the sun

Explanation:

This is the correct answer.

Answer:

everything is perished isn't it?

hope it helps.

Answer:

isn't it is the answer of your question

hope it is helpful to you

Answer:

330 Hz

Explanation:

edg2020

The best estimate of the frequency Suzy hears after the car passes her is govern by doppler effect and it is 330 Hz.

Frequency is the number of occurrences of a repeating event per unit of time.

The Doppler effect is the change in frequency of a wave in relation to an observer who is moving relative to the wave source.

According to the Doppler Effect, the frequency observed by an observer decreases for source going away.

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The reason why problems involving mechanical energy fail to meet this rule with an exact answer is because mechanical energy is not a conserved quantity in real-world situations.

The law of conservation of mechanical energy states that the total mechanical energy of a closed system, which includes both potential energy(PE) and kinetic energy(KE), remains constant as long as no external forces act on the system.

In an ideal situation, where there is no friction or other external forces acting on the system, the total mechanical energy would remain constant. However, in most real-world situations, there are always external forces present, such as air resistance or friction, that cause some of the mechanical energy to be lost or converted into other forms of energy such as heat or sound. Therefore, it is impossible to have an exact answer when dealing with mechanical energy problems in real-world situations.

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Answer:

please do write it in english

Answer:  A big Yes

Explanation: Viscosity depends strongly on temperature. In liquids, it usually decreases with increasing temperature, whereas, in most gases, Viscosity increases with increasing temperature.

As temperature increases, the average kinetic energy of the molecules also increases; it more easily overcomes the attractive forces between molecules. Therefore, Viscosity decreases with increasing temperature.

For example, when syrup is cold it has a high viscosity and can be difficult to pour. When heated in a microwave, the viscosity decreases and the syrup flows more freely. Similarly, Honey and oil tend to flow better at higher temperatures.

Both cohesion and molecular interchange contribute to liquid viscosity.  With high temperatures, viscosity increases in gases and decreases in liquids, the drag force will do the same.

When a liquid is heated, the kinetic energy of its molecules increases and the intermolecular attraction becomes weaker. Hence, the viscosity of a liquid decreases with an increase in its temperature.

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It is 1.93 metres away from the post.

for vertical motion

\(S= u t + \frac{1}{2} g t^{2}\)

S = 0 +  \(\frac{1}{2} g t^{2}\)

1.7 = \(\frac{1}{2} 9.8 t^{2}\)

t = 0.589 sec

using law of  conservation of momentum, on the horizontal motion

\(m_{bullet} \ v_{bullet i} = m_{bullet} \ v_{bullet f} + m_{tin} \ v_{tin}\)

\(0.0020 = 0.0020 \ 3 \ 720 + 0.11 \ v_{tin}\)

\(v_{tin}\) = 3.273 m/s

S = \(v_{tin} \ t\)

   = 3.273 m/s * 0.589 s

   = 1.93 m

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