How do I solve this?

Answer: B) 100N

Explanation:usatestprep

Photon with wavelength 0.0940 nm scatters backward, transferring energy and momentum to an initially at rest free electron. (a) The energy of the scattered photon is approximately 2.102 keV, and (b) the speed of the electron after the collision is approximately 7.679 × 10¹⁴ m/s.

Here is the explanation :

a) To find the energy of the scattered photon, we can use the energy-wavelength relationship for photons:

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

Where:

E is the energy of the photon,

h is Planck's constant (6.626 × 10⁻³⁴ J·s),

c is the speed of light (3.00 × 10⁸ m/s),

λ is the wavelength of the photon.

First, let's convert the wavelength from nanometers to meters:

λ = 0.0940 nm = 0.0940 × 10⁻⁹ m

Substituting the values into the equation, we have:

\(E = \frac{6.626 \times 10^{-34} \cdot 3.00 \times 10^{8}}{0.0940 \times 10^{-9}} \text{ J}\)

Calculating this expression, we find:

E ≈ 2.102 keV

Therefore, the energy of the scattered photon is approximately 2.102 keV.

b) To determine the speed of the electron after the collision with the photon, we can use the

. Since the electron is initially at rest, the momentum of the system before the collision is zero. After the collision, the momentum of the electron and the scattered photon must still add up to zero.

Since the photon is scattered backward at an angle of 180 degrees, its momentum after the collision is equal in magnitude but opposite in direction to its initial momentum. Let's denote the magnitude of the photon's momentum as p.

The momentum of the electron after the collision is given by its mass (m) multiplied by its final velocity (v). Let's denote the final velocity of the electron as \(v_\text{e}\).

Considering the conservation of momentum, we have:

-p + m * \(v_\text{e}\) = 0

Solving for \(v_\text{e}\), we find:

\(v_\text{e} = \frac{p}{m}\)

The momentum of a photon can be calculated using the equation:

\(p = \frac{E}{c}\)

Where:

E is the energy of the photon,

c is the speed of light.

Using the energy value we calculated in part a, we have:

\(p = \frac{2.102 \times 10^{-1}}{3.00 \times 10^{8}} \text{ MeV/m}\)

Calculating this expression, we find:

p ≈ 7.007 × 10⁻¹⁶ kg·m/s

Now, the mass of an electron is approximately 9.109 × 10⁻³¹ kg. Substituting these values into the equation for the final velocity, we have:

\(\begin{equation}v_e = \frac{7.007 \times 10^{-16} \text{ kg·m/s}}{9.109 \times 10^{-31} \text{ kg}}\)

Calculating this expression, we find:

v_e ≈ 7.679 × 10¹⁴ m/s

Therefore, the speed of the electron after the collision with the photon is approximately 7.679 × 10¹⁴ m/s.

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Answer:

Flexible and responsive to the clients requests

Explanation:

Change in design is the alteration of the specification of a product based on present or current requirements, as such change in design can take place at any stage of a product life cycle.

However, it is more cost effective to make changes to the design at the early stages of a product than at the later stages, due to the cost incurred in making adjustments and the previous expenses incurred if the design that was later changed had moved into more advanced stages.

To keep the strength of the electromagnet constant, you can increase the number of turns in the coil by a factor of 2.

The estimated temperature of the radiant wall heater when operating is approximately 257 Kelvin.

To estimate the temperature of the radiant wall heater, we can use the Stefan-Boltzmann law, which relates the power radiated by an object to its temperature.

The formula for power radiated is given by:

P = σ * A * T^4

where P is the power radiated, σ is the Stefan constant (6 x 10^-8 Wm^-2K^-4), A is the surface area of the heater, and T is the temperature in Kelvin.

First, we need to calculate the surface area of the silica cylinder. The formula for the surface area of a cylinder is:

A = 2πrh + 2πr^2

where r is the radius and h is the height (length) of the cylinder.

Given:

Radius, r = 6 mm = 6 x 10^-3 m

Length, h = 0.6 m

Plugging in these values, we can calculate the surface area:

A = 2π(6 x 10^-3 m)(0.6 m) + 2π(6 x 10^-3 m)^2

 = 0.072π m^2

Now, we can rearrange the Stefan-Boltzmann law to solve for temperature T:

T^4 = P / (σ * A)

Given:

Power, P = 1.5 kW = 1500 W

Stefan constant, σ = 6 x 10^-8 Wm^-2K^-4

Surface area, A = 0.072π m^2

Plugging in these values, we get:

T^4 = (1500 W) / (6 x 10^-8 Wm^-2K^-4 * 0.072π m^2)

T^4 ≈ 3.1 x 10^9 K^4

Taking the fourth root of both sides, we find:

T ≈ 257 K

Therefore, the estimated temperature of the radiant wall heater when operating is approximately 257 Kelvin.

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Answer:

13n pushing left

Explanation:

1563 - 1550

Answer:

3 × 10 to the power minus 6 milliseconds

When we convert 3 x 10⁻⁹ s into milliseconds it would be 3 x 10⁻⁶milliseconds

In positional notation, significant figures refer to the digits in a number that is trustworthy and required to denote the amount of something, also known as the significant digits, precision, or resolution.

If a number describing the result of a measurement (such as length, pressure, volume, or mass) includes more digits than the number of digits permitted by the measurement resolution, only the digits allowed by the measurement resolution can be significant figures.

As given in the problem we have to convert 3 x 10⁻⁹ s into milliseconds

1 second = 1×10³ milliseconds

3 x 10⁻⁹ seconds =  (3 x 10⁻⁹)  ×  (1×10³ )

                            = 3 x 10⁻⁶milliseconds

Thus, 3 x 10⁻⁹ s converted into milliseconds it would be 3 x 10⁻⁶ milliseconds

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A helicopter is a type of aircraft which uses spinning blades ( wings) to fly .

Answer:

Step 1: Calculate the amount of sodium hydroxide in moles

Volume of sodium hydroxide solution = 50.0 ÷ 1,000 = 0.05 dm3

Rearrange:

Concentration in mol/dm3 = amount of solute in molvolume in dm3

Amount of solutein mol = concentration in mol/dm3 × volume in dm3

Amount of sodium hydroxide = 0.300 × 0.05

= 0.01 5mol

Step 2: Find the amount of hydrochloric acid in moles

The balanced equation is: NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

So the mole ratio NaOH:HCl is 1:1

Therefore 0.015 mol of NaOH reacts with 0.015 mol of HCl

Step 3: Calculate the concentration of hydrochloric acid in mol/dm3

Volume of hydrochloric acid = 25.00 ÷ 1000 = 0.025 dm3

Concentration in mol/dm3 = amount of solute in molvolume in dm3

Concentration in mol/dm3 = 0.015/0.025

= 0.6 mol/dm3

Step 4: Calculate the concentration of hydrochloric acid in g/dm3

Relative formula mass of HCl = 1 + 35.5 = 36.5

Mass = relative formula mass × amount

Mass of HCl = 36.5 × 0.6

= 21.9 g

So concentration = 21.9 g/dm3

Answer:

Option D. 5Ω e 0.6 A

Explanation:

1. Determination of the equivalent resistance.

We'll begin by calculating the equivalent resistance of resistor B and resistor C. This can be obtained as follow:

Resistor B (R₆) = 2 Ω

Resistor C (R꜀) = 2 Ω

Equivalent Resistance (R₆꜀) =?

R₆꜀ = R₆ × R꜀ / R₆ + R꜀ (parallel connection)

R₆꜀ = 2 × 2 / 2 + 2

R₆꜀ = 4 / 4

R₆꜀ = 1 Ω

Finally, we shall determine the equivalent resistance of the circuit. This can be obtained as follow:

Resistor A (Rₐ) = 2 Ω

Equivalent resistance of resistor B and C (R₆꜀) = 1 Ω

Resistor D (Rₔ) = 2 Ω

Equivalent Resistance (R) =?

R = Rₐ + R₆꜀ + Rₔ (series connection)

R = 2 + 1 + 2

R = 5 Ω

Thus, the equivalent resistance of the circuit is 5 Ω

2. Determination of the total current in the circuit.

Potential difference (V) = 3 V

Equivalent resistance (R) = 5 Ω

Total current (I) =?

V = IR

3 = I × 5

Divide both side by 5

I = 3 / 5

I = 0.6 A

Thus, the total current in the circuit is 0.6 A

Summary:

Equivalent resistance = 5 Ω

Current = 0.6 A

Option D gives the current answer to the question.

Answer:C car

Explanation:

Answer:

24J

Explanation:

The energy output will be the 20% it lost in efficiency:

120-80% = 24J

Rahul should change the lengths of the vectors that point tangent to the circle so that each is the same length.

Uniform Circular Motion:

A uniform circular motion is a motion in a circle where the tangential speed of the object is constant.

In the motion map:

In this motion map,  the length of the vectors pointing tangent to the circle is not constant: this means that the speed is not constant. In order to have a uniform circular motion, the speed must be constant, therefore the lengths of the vectors that point tangent to the circle must be the same.

Thus, we can conclude that Rahul should change the lengths of the vectors that point tangent to the circle so that each is the same length.

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Answer:

15%

Explanation:

Step one:

Given data

Energy source= 300J

Useful energy = 45J

Waste energy = 255J

Required

The efficiency of the solar system

Step two:

The efficiency is computed by factoring only the useful work and the energy source

Efficiency= 45/300*100

Efficiency= 0.15*100

Efficiency= 15%

The cart travels approximately 3.33 meters when a man is pulling a cart having a mass of 2kg and an acceleration of 3 m/s².

To find the distance traveled by the cart, we'll use the work-energy theorem, which states that the work done on an object is equal to the change in its kinetic energy. The formula for work is:
Work = Force x Distance x cos(θ)
Since the man is pulling the cart, the angle (θ) between the force and the distance is 0 degrees, and cos(0) = 1.

So the formula simplifies to:
Work = Force x Distance
The force acting on the cart can be found using Newton's second law of motion:
Force = Mass x Acceleration
Given that the mass of the cart is 2 kg and its acceleration is 3 m/s², we can calculate the force:
Force = (2 kg) x (3 m/s²) = 6 N
Now we can find the distance traveled using the work done (20 J) and the force (6 N):
20 J = (6 N) x Distance
To solve for distance, divide both sides by 6 N:
Distance = 20 J / 6 N = 10/3 meters ≈ 3.33 meters

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The mass of the vessel, m = 74400 kg

The external diameter, d = 5.20 m

Radius, r = 5.2 / 2 = 2.6 m

The volume of the vessel is given by the volume of a sphere

a) The buoyant force (B) is given by the formula:

b) The tension in the cable is given by the equation

Where T represents the tension

T = 739613.35 - 74400(9.8)

T = 10493.35

Answer: thermal energy

Explanation:

Answer:

Camaflouge

Explanation:

When animals blend in with their surroundings to hide from predators.

Ex: A squirrel climbing a tree that is the same color of its fur.

An artic fox lying in the snow.

A bee getting pollen.

Stick bugs blending in with shrubs and trees.

The bullet takes 0.0025 seconds to pass through the wooden plank of 5 cm thickness when it is traveling horizontally with an initial speed of 30 m/s and a final speed of 10 m/s.

The time taken by the bullet to pass through the wooden plank can be determined using the equation of motion for constant acceleration.

Given:
Initial speed (u) = 30 m/s

Final speed (v) = 10 m/s

Distance (s) = 5 cm = 0.05 m

To find the time taken (t), we need to calculate the acceleration (a) first. We can use the equation:

v² = u² + 2as

Rearranging the equation, we have:

a = (v² - u²) / (2s)

Substituting the given values:

a = (10² - 30²) / (2 * 0.05)

Simplifying the expression:

a = (-800) / (0.1)

a = -8000 m/s²

The negative sign indicates that the acceleration is in the opposite direction of the initial velocity.

Next, we can use the equation of motion:

v = u + at

Substituting the values:

10 = 30 + (-8000) * t

Simplifying the equation:

-8000t = -20

Dividing by -8000:

t = 20 / 8000
t = 0.0025 s

Therefore, the time taken by the bullet to pass through the wooden plank of 5 cm thickness is 0.0025 seconds.


To find the time taken by the bullet to pass through the wooden plank, we need to calculate the acceleration first using the equation of motion.

By rearranging the equation and substituting the given values, we can find the acceleration.

Then, using the equation of motion again, we can solve for time.

The negative sign in the acceleration indicates that it is in the opposite direction of the initial velocity.

The resulting time is 0.0025 seconds.

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To determine the value of ΔG° for the dissociation of acetic acid, we can use the equation:

ΔG° = -RT ln(K)

where ΔG° is the standard Gibbs free energy change, R is the gas constant (8.314 J/(mol·K)), T is the temperature in Kelvin, and K is the equilibrium constant.

Given:

Equilibrium constant (K) = 1.75x10^(-5)

Temperature (T) = 25°C = 298 K

Plugging these values into the equation, we have:

ΔG° = - (8.314 J/(mol·K)) × (298 K) × ln(1.75x10^(-5))

Calculating the value, we find:

ΔG° ≈ - (8.314 J/(mol·K)) × (298 K) × (-10.867)

ΔG° ≈ 2.27 kJ/mol

Therefore, the value of ΔG° for the dissociation of acetic acid is approximately 2.27 kJ/mol. Option C (2.28 kJ/mol) is the closest choice to this value.

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Answer:

greater then five

Explanation:

Answer:

Equal to 5

Explanation:

Newton's third law. Hit the baseball or kick the soccer ball with a small amount of force. The ball will not travel very far. Then, hit or kick the ball with a large amount of force and watch what happens. The ball will have an equal and opposite reaction to the amount of force it his hit with.

Answer:

BOIIII english????

Explanation:

A joint that allows movements in many directions around a central point is known as a ball-and-socket joint.

This type of joint is formed by a ball-shaped surface of one bone fitting into a cup-like depression of another bone. The ball-and-socket joint allows movement in all directions, including flexion, extension, abduction, adduction, and rotation. Examples of ball-and-socket joints in the human body include the hip joint and the shoulder joint. The hip joint connects the thigh bone (femur) to the pelvic bone and is responsible for supporting the weight of the upper body and enabling a wide range of movements, such as walking, running, and jumping. The shoulder joint, also known as the glenohumeral joint, connects the upper arm bone (humerus) to the shoulder blade (scapula) and allows movements such as lifting the arm above the head, reaching behind the back, and rotating the arm.

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Students watched a cartoon either alone or with others and then rated how funny they found the cartoon to be.

Independent Variable:  student alone or with others

Dependent Variable:   how funny student thought the cartoon was

Answer:

Independent Variable: Watching cartoon alone or with others

Dependent Variable: how funny they found the cartoon to be

Explanation:

A dependent variable is the variable being tested. The change in the value of dependent variable depends on the independent variable.

An independent variable is used to test the effects on dependent variable and its does not depend on any variable.

In the above example the dependent variable is how funny the cartoon was. This is being tested and it is tested by independent variable i.e. Students watching cartoon either alone or with others. So the cartoon is funny or not depends on watching cartoon alone or with friends.

The relationship between mass and kinetic energy is K.E ∝ m and K.E ∝ v².

The kinetic energy of an object exists as the energy that it maintains due to its motion. It is defined as the work required to accelerate a body of a disseminated mass from rest to its stated velocity. Having acquired this energy during its acceleration, the body preserves this kinetic energy unless its speed changes.

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The integral of 1/(1 + x²) is (1/2)ln|1 + x²| + C where C is the constant of integration.

Integration is a mathematical process of finding the antiderivative of a function. To integrate the given expression 1/(1 + x²), we will use the substitution method.

Let u = 1 + x², du/dx = 2x dx, then dx = du/2x and the integral becomes:

∫1/(1 + x²) dx = ∫1/u * (1/2x) du= (1/2)∫1/u du

The antiderivative of 1/u is ln|u| + C, where C is the constant of integration.

Therefore, the final solution of the integral is (1/2)ln|1 + x²| + C.

Let us work through the steps:

Step 1:Let u = 1 + x² and then differentiate both sides with respect to x to obtain du/dx. du/dx = 2x

Substitute 2x dx = du into the integral ∫1/(1 + x²) dx to get the integral in terms of u:∫1/u * (1/2x) du = (1/2) ∫1/u du

Step 2:Calculate the antiderivative of 1/u, which is ln|u|. Thus, the final solution is (1/2)ln|1 + x²| + C, where C is the constant of integration. The constant C will vary depending on the initial conditions of the problem.

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Answer: black holes

Explanation:

The amount of energy (in joules) required to warm 4.37 g of silver by ΔT degrees Celsius can be calculated using the equation Q = 1.0488 * ΔT.

The specific heat capacity (C) of a substance is the amount of energy required to raise the temperature of 1 gram of that substance by 1 degree Celsius. In this case, the specific heat capacity of silver is 0.24 J/g°C.

To calculate the energy required to warm 4.37 g of silver, we need to multiply the mass (m) by the specific heat capacity (C) and the change in temperature (ΔT). The change in temperature is not provided in the question, so we'll assume it is given.

Let's assume the change in temperature is ΔT°C. The formula to calculate the energy (Q) is:

Q = m * C * ΔT

Substituting the given values:

Q = 4.37 g * 0.24 J/g°C * ΔT

The units of grams cancel out, and we are left with:

Q = 1.0488 J/°C * ΔT

So, the amount of energy (in joules) required to warm 4.37 g of silver by ΔT degrees Celsius can be calculated using the equation Q = 1.0488 * ΔT.

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The apparent weight of a 72 kg passenger at the lowest point of a circle is 0 N (weightless).

The apparent weight of an object is the force exerted on it by a supporting surface. Apparent weight is determined by the gravitational force acting on an object and the normal force acting on it. In the case of a passenger at the lowest point of a circle, the normal force is equal to the gravitational force, thus the apparent weight is 0 N. At the lowest point of a circle, the gravitational force and the normal force acting on an object are in the same direction, and the gravitational force is acting in the opposite direction of the normal force, so the two forces cancel out each other, resulting in an apparent weight of 0 N. The passenger will feel weightless.

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