What is the wavelength of an electron moving at 3. 94 x 107 m/s?.

Answer:

a. Hooke's law is a principle in physics that states that the force required to extend or compress a spring or elastic material is directly proportional to the displacement of its end or deformation.

b. The formula for resistance of a wire is given by:

R = (ρL)/A

where R is resistance, ρ is resistivity, L is length, and A is cross-sectional area.

Given L = 10m, A = 0.1 mm² = 0.1 x 10^-6 m², and ρ = 50 µcm = 50 x 10^-8 Ωm, we have:

R = (50 x 10^-8 x 10) / (0.1 x 10^-6)

R = 5 Ω

Therefore, the resistance of the wire is 5 Ω.

The formula for Young's modulus is given by:

Y = F L / A ΔL

where Y is Young's modulus, F is force, L is length, A is cross-sectional area, and ΔL is the change in length.

Given F = 2 kgf = 2 x 9.81 N, L = 2 m, d = 0.64 mm = 0.64 x 10^-3 m, and ΔL = 0.60 mm = 0.60 x 10^-3 m, we have:

A = πd²/4 = π(0.64 x 10^-3)²/4 = 3.21 x 10^-7 m²

Y = (2 x 9.81 x 2) / (3.21 x 10^-7 x 0.60 x 10^-3)

Y ≈ 1.24 x 10^11 N/m²

Therefore, the Young's modulus of the wire is approximately 1.24 x 10^11 N/m².

Explanation:

Answer:

Friction is defined as the force that opposes the motion of a solid object over another. There are mainly four types of friction: static friction, sliding friction, rolling friction, and fluid friction. Friction and normal force are directly proportional to the contacting surfaces and it doesn’t depend on the hardness of the contacting surface. With the increase in relative speeds, the sliding friction reduces whereas fluid friction increases with the increase in the relative speed, also fluid friction is dependent on the viscosity of the fluid.

In sliding motion, each point on the body has only translational or linear motion. But in case of rolling motion, different points have a combination of linear as well as rotational motion.

Types Of Friction

Static Friction

Sliding Friction

Rolling Friction

Fluid Friction

Static Friction

Answer: +20N

Explanation:

First we look at our given information. You are finding the sum of the forces on the ball and they already give you the magnitude and direction of the forces. This means we can disregard the mass (1kg) of the ball and what the forces are from (gravity and floor pushing on the ball). The only things that matter are magnitude and direction.

Now we have to give each force either a positive or negative sign. I am assuming we are using the ground as a frame of reference. When we move towards a frame of reference, the sign is negative. When we move away from a frame of reference. This means that the upward vector will have a positive sign (+30N) and the downward vector will have a negative sign (-10N).

Now all we have to do is add the two together:

+30 + (-10) = +20

All done!!

When a rigid body rotates about a fixed axis, all the points in the body have the same tangential speed.

Explanation:

Tangential speed is the linear speed of an object moving along a circular path. The centripetal force is the force that acts on an object moving in a circular path and is directed toward the center of the circle. Centripetal force and tangential speed are related to each other.

The centripetal force acting on an object is proportional to the square of its tangential speed. However, the given question, asks for the property that is the same for all the points in the rigid body. All the points in a rigid body rotating about a fixed axis have the same tangential speed. This is because all points in the rigid body move along the same circular path at the same angular speed. Hence, the correct option is 1: tangential speed.

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At pH = 1.20, the concentration of HI must be high and the concentration of H+ must be high as well, so HI is mostly in the form of H+ ions.

At pH = 1.70, the concentration of HI is lower and the concentration of H+ is lower as well, so HI is mostly in the form of HI molecules.

At pH = 2.80, the concentration of HI is even lower and the concentration of H+ is even lower as well, so HI is mostly in the form of HI molecules.

To determine the mass of HI present in a solution at a specific pH, you would need to use the acid dissociation constant (KA) of HI and the concentration of the solution.

Given the pH values, it would be difficult to determine the mass of HI present in 0.300 L of solution without knowing the acid dissociation constant (KA) of HI and the initial concentration of HI in the solution.

The mass of HI refers to the amount of HI (Hydrogen Iodide) present in a solution. It is typically measured in grams. To determine the mass of HI in a solution, you would need to know the concentration of the solution and the volume of the solution. The equation to calculate mass of HI would be: mass = concentration x volume.

It is also important to know that the mass of HI would change depending on the degree of dissociation, the mass of HI would be different in different pH values.

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Without specific information about the molecule in question, it is not possible to determine the electronic states that are accessible from the a1 ground electronic state or the polarizations of the transitions.

The electronic states accessible by electric dipole transitions depend on the specific electronic structure of the molecule, which in turn determines the allowed electronic transitions.

Similarly, the polarization of the transitions will depend on the orientation and symmetry of the molecule and the direction of the electric field vector of the incident light.

Therefore, to determine the electronic states accessible by electric dipole transitions and their polarizations, it is necessary to have more information about the specific molecule and the experimental conditions.

This information can be obtained through various spectroscopic techniques such as UV-visible absorption, fluorescence, or Raman spectroscopy.

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Answer:

You know that catalysts lower the activation energy required for a reaction to occur. With the activation energy lower, the products can also combine more easily. Therefore, the forward and reverse reactions are both accelerated. It changes both rates and usually changes the equilibrium point.

Explanation:

hope it helps

The time taken for the passenger jet to move from 5 km/h to 460 km/h on the run way during the take off is 10.03 s

From the question given above, the following data were obtained:

The time taken for the the passenger jet to move from 5 km/h to 460 km/h can be obtained as follow:

a = (v – u) / t

12.6  = (127.78 – 1.39) / t

12.6 = 126.39 / t

Cross multiply

12.6  × t = 126.39

Divide both sides by 12.6

t = 126.39 / 12.6

t = 10.03 s

Thus, we can conclude that the time taken is 10.03 s

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Answer:

  875

Explanation:

The digits more significant than the last two integer digits are dropped from the pressure reading placed on the upper right of the station model. Generally, the dropped digits will be 9 or 10.

987.5 mb would be recorded as 875 on the model.

Answer:

faces

Explanation:

Answer:

Explanation:

Completing the sentence given ; Only the most reactive metals react with water

Reactivity of metals is a chemical property that measures the rate at which metals easily loses their electrons in substances to form a positive ion in a substance.

The most reactive metals react vigorously with water while the least reactive metals does not react with water and dilute acids vigorously but they slowly react with oxygen.

Examples of very reactive metals are :

Hence we can conclude that Only the most reactive metals react with water.

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Answer:

Sixty percent of all active volcanoes occur at the boundaries between tectonic plates. Most volcanoes are found along a belt, called the “Ring of Fire” that encircles the Pacific Ocean. Some volcanoes, like those that form the Hawaiian Islands, occur in the interior of plates at areas called “hot spots.”

Explanation:

Volcanoes are found around tectonic plates because the convection currents move the plates. Where convection currents diverge near the Earth's crust, plates move apart. Where convection currents converge, plates move towards each other, plates converge and the plates move together, also known as ridge push, therefore mountains and volcanoes are formed

Hope this helps :)

Answer:

Explanation:

1 )

F = k q₁q₂ / r² where k = 9 x 10⁹

So force F₁ =  \(\frac{kq_1q_2}{(\frac{r}{2}+\frac{\sqrt{9} r}{2})^2 }\)

= \(\frac{kq_1q_2}{(\frac{r}{2}+\frac{3 r}{2} )^2 }\)

= k q₁q₂ /4 r²

F₁  =  F / 4

2 ) Electric field due to charge density σ

= σ / ε₀

So net electric field between the plates

=   ( σ₁ - σ₂ )  / ε₀

Force on charge  q

=  ( σ₁ - σ₂ ) q   / ε₀

work done = force x displacement

=  ( σ₁ - σ₂ ) x q x d   / ε₀

Answer:

See the explanation below.

Explanation:

To solve this problem we must apply Newton's second law, which tells us that the sum of forces on a body is equal to the product of mass by acceleration and this force can be calculated by means of the following equation.

F = m*a

where:

F = force [N] (units of Newtons)

m = mass [kg]

a = acceleration [m/s²]

The mass of the tennis ball will always be the same therefore it will never change.

Now clearing a:

\(a=\frac{F}{m}\)

If the mass of the ball remains the same:

\(a = \frac{100}{m} ; a = \frac{200}{m};a =\frac{300}{m}\)

We see that for a force of 300 [N], the acceleration exerted on the ball must be greater. Therefore with the force of 300 [N] the greatest acceleration is achieved.

Answer: Substance 3 is liquid at room temperature

Explanation: The common room temperature is assumed to be 20-22°C, we need to find the substance that will be in liquid state in that temperature.

For Substance 1, the boiling point is -195.975°C, and hence at room temperature, it would be in vapor phase and all liquid would have turned to gas.

For Substance 2, the boiling point is 3.85°C, and hence at room temperature, it would be in vapor phase and all liquid would have turned to gas in this case too.

For Substance 3, the boiling point is 77.85°C, and melting point is -108.15°C, hence at room temperature, it would be in liquid state.

For Substance 4, the melting point itself is 1800°C, due to which at room temperature it would be in solid state.

Answer: I believe the frequency of a wave is 66.6667 Hz :)

Explanation:

\(velocity = \frac{distance}{time} \)

\( \frac{(30 + 10 + 80) \times 1000}{83 \times 60} \)

\( = 0.024m.{s}^{ - 1} \)

Answer:

30 Kilometers per second

Answer:

Because the mechanical advantage of the machine is affected by friction and weight but velocity ratio is not. So, mechanical advantage is less than velocity rate. Thus, the machine's efficiency is less than 100% and can't be a perfect machine

Sound moves faster in the denser regions of the ocean than in the less dense regions of the ocean.

We know that sound is a wave whose medium of propagation isthrough matter. Hence, sound move faster in a dense object than in a less dense object.

As such, sound moves faster in the denser regions of the ocean than in the less dense regions of the ocean.

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Answer:

total current

Explanation:

In a parallel circuit, the current leaves the power source and then splits into multiple branches that have individual components. Each branch operates independently of the other branches, and the current flows through each component and then recombines and enters back into the power source.

Because each branch is independent, the current flowing in each branch can be different, depending on the resistance of the components in that branch. However, the total current entering the circuit is equal to the sum of the currents in each branch, as long as the circuit is properly wired.

So the total current that leaves and reenters the power source in a parallel circuit is equal to the sum of the currents in each branch, and this is known as the total or overall current of the circuit.

Answer:

2m/s

Explanation:

Calculate the slope at any point as the line is linear. i.e. 20/10 = 2/1 m/s

To determine the mass of oxygen that is in 87.7g of magnesium nitrate, we can use the following steps:

Step 1: Find the molecular weight of magnesium nitrate (Mg(NO3)2)Mg(NO3)2 has a molecular weight of:1 magnesium atom (Mg) = 24.31 g/mol2 nitrogen atoms (N) = 2 x 14.01 g/mol = 28.02 g/mol6 oxygen atoms (O) = 6 x 16.00 g/mol = 96.00 g/molTotal molecular weight = 24.31 + 28.02 + 96.00 = 148.33 g/mol. Therefore, the molecular weight of magnesium nitrate (Mg(NO3)2) is 148.33 g/mol. Step 2: Calculate the moles of magnesium nitrate (Mg(NO3)2) in 87.7 g.Moles of Mg(NO3)2 = Mass / Molecular weight= 87.7 g / 148.33 g/mol= 0.590 molStep 3: Determine the number of moles of oxygen (O) in Mg(NO3)2Moles of O = 6 x Moles of Mg(NO3)2= 6 x 0.590= 3.54 molStep 4: Calculate the mass of oxygen (O) in Mg(NO3)2Mass of O = Moles of O x Molecular weight of O= 3.54 mol x 16.00 g/mol= 56.64 g.

Therefore, the mass of oxygen that is in 87.7 g of magnesium nitrate (Mg(NO3)2) is 56.64 g.

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Answer:

25N

Explanation:

soln:

given,

mass(m)=0.5kg

acceleration(a)=50m/s^2

force(F)=?

we know,

F=m*a

or,F=0.5*50

•°•F=25N

The car's velocity is 2 m/s.

Hope you could get an idea from here.

Doubt clarification - use comment section.

The Coriolis force and friction play a critical role in the modification of air movement. The Coriolis force is a result of the Earth's rotation. It has a significant impact on air movements, particularly for large-scale movements such as winds, cyclones, and anticyclones. When the air moves north or south, the Coriolis force deflects the airflow to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.

The Coriolis force and friction play significant roles in modifying air movement in the atmosphere.

The Coriolis force is a result of the rotation of the Earth. As air moves horizontally across the Earth's surface, it experiences an apparent deflection due to the Coriolis force. In the Northern Hemisphere, the Coriolis force causes moving air to deflect to the right, while in the Southern Hemisphere, it causes deflection to the left. This deflection affects large-scale air movements, such as the circulation patterns of high and low-pressure systems and the formation of global wind belts.

Friction, on the other hand, occurs when air encounters the Earth's surface or other objects. It acts to slow down or impede the movement of air. Close to the Earth's surface, friction has a significant impact on air movement, causing the wind to slow down and change direction. Frictional effects are more pronounced near the surface compared to higher altitudes where air encounters less resistance.

The combined influence of the Coriolis force and friction alters the behavior of air movement. Near the surface, friction reduces the wind speed and causes it to flow across isobars (lines connecting points of equal pressure) towards lower pressure areas. This creates a convergence of air near the surface, leading to the upward motion and the development of clouds and precipitation. In the upper levels of the atmosphere, where friction is minimal, the Coriolis force dominates and guides the air into large-scale circulation patterns.

In summary, the Coriolis force causes the deflection of moving air due to Earth's rotation, while friction modifies air movement by slowing it down and altering its direction near the Earth's surface. Together, these factors shape the circulation of air masses, weather systems, and global wind patterns.

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Answer:Δx=v0t + 1/2 at 2

Answer:

I think its A

Explanation:

Not 100 percent sure tho but they do go up and down in big movements.