If an atom absorbs a photon
a) the photon must have the right energy for the atom's energy levels.
b) the atom will gain energy.
c) other photons summoning to the same total energy may later be emitted.
d) the atom will move to a higher energy level.

When working through these problems, think about the heat in terms of movement of the molecules of water.

Heat is transferred from the water to the surroundings --- water molecules slowing down.

Heat is transferred to the water from the surroundings --- water molecules heating up.

Heat transfer is the transfer of energy due to the difference of temperature between two different places. The main discussion in heat transfer is how the energy in heat can move places and the rate of transfer under certain conditions. Heat transfer includes the processes of inflow and outflow of heat. In industrial processes, heat transfer is used to achieve the required temperature in the industrial process and maintain the required temperature throughout the process.

Heat transfer from one object to another can occur by conduction, convection, and radiation. The determinant of heat transfer is the temperature difference. The direction of heat transfer starts from a medium with a high temperature to a medium with a lower temperature. Heat transfer can occur with a single process or multiple processes.

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Petroleum is a non-renewable resource, which means that it cannot be replenished. Because of this, its usage needs to be planned properly to make sure that there is sufficient availability for present and future needs

The optimal level of use of petroleum can be achieved by several ways which are listed below:

1. Reduce wastage: The optimal level of petroleum use can be achieved by reducing wastage. We should aim to use petroleum products efficiently to minimize wastage and ensure that the resource is not used up too quickly.

2. Develop alternative energy sources: Another way to achieve the optimal level of petroleum use is to develop alternative energy sources. Renewable energy sources like solar, wind, and hydro can be developed to supplement petroleum.

3. Increase efficiency: The third way to achieve the optimal level of petroleum use is to increase efficiency. We can achieve this by improving the efficiency of vehicles and machinery that consume petroleum products.

4. Conservation: Conservation can also help achieve the optimal level of petroleum use. We can conserve petroleum by using it judiciously and avoiding unnecessary use. We can also reduce our reliance on petroleum products by using alternatives like public transport or bicycles.

5. Develop sustainable transportation: Developing sustainable transportation can also help achieve the optimal level of petroleum use. We can develop transportation systems that are more efficient, rely on alternative energy sources, and reduce the amount of petroleum consumed.

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Answer:2n

Explanation:10/5=2

Answer:

You must exert a force of 4.5 N on a book to slide it across a table.

Explanation:

The maximum horizontal force that can be applied to the lower block without the upper block slipping is approximately 10.29 N.

To determine the maximum horizontal force that can be applied to the lower block without the upper block slipping, we need to consider the force of static friction between the two blocks.

The maximum force of static friction (F_static_max) can be calculated using the equation:

F_static_max = μ * N

where μ is the coefficient of static friction and N is the normal force between the blocks.

In this case, the normal force (N) is equal to the weight of the upper block, which can be calculated as:

N = m * g

where m is the mass of the upper block and g is the acceleration due to gravity.

Given that the two blocks are identical and each has a mass of 3 kg, the normal force is:

N = (3 kg) * (9.8 m/s^2) = 29.4 N

Now we can calculate the maximum force of static friction:

F_static_max = (0.35) * (29.4 N) ≈ 10.29 N

Therefore, the maximum horizontal force that can be applied to the lower block without the upper block slipping is approximately 10.29 N.

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Answer:

T

Explanation:

true, Mechanical waves are waves that transfer energy through material medium

Answer:

True

Explanation:

Mechanical waves are an oscillation of matter that transfers energy through a medium. The oscillation does not cause movement of the matter. The mechanical wave will travel until all the initial amount of energy is transferred. Sound waves and ocean waves are examples of mechanical waves.

Answer:

The SI unit of current is Ampere(A)

Answer:

Ampere ( A)

Explanation:

the S.I unit of current is Ampere(A)

The color of light that travels faster in crown glass is red.

The speed of light in crown glass is the speed of light in a vacuum divided by the index of refraction of crown glass.

The speed of light traveling in vacuum = 3 times 10 to the 8 meters per second

The index of refraction of the crown glass for red light = 1.513

The index of refraction of the crown glass for blue light = 1.529

Therefore:

The speed of red color = 1.983 times 10 to the 8 meters per second

The speed of blue color = 1.962 times 10 to the 8 meters per second

Hence, the red light travels faster.

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The force constant of the spring is 200.696 N/m & The height the object achieves when the spring releases its energy is 2.5087 m

The spring constant is the force needed to stretch or compress a spring, divided by the compressive or expansive distance. It's used to determine stability or instability in the spring, and therefore the system it's intended for. we know,

F = kx

Therefore,

k = F/x

We also know that the force being exerted on the spring is equal to the mass of the object. Hence, F = mg = 5.13 * 9.8 N = 50.174 N and we know compression due to the mass is 0.25m. Therefore,

K = 50.174/0.25 N/m

K = 200.696 N/m

Therefore, The Spring Constant is 200.696 N/m

On release, the spring potential energy gets converted to kinetic energy. Hence, on release, the height attained by the object is given by:

h = \(1/2 kx^{2}\)

We know that k=200.696 N/m and x=0.25 m. Therefore the height is:

h = \(1/2 (200.696 N/m)(0.25 m)^{2}\)

h = 2.5087 m

Therefore, the force constant of the spring is 200.696 N/m & The height the object achieves when the spring releases its energy is 2.5087 m

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Answer:

It will take the marathon runner about 28.27 s to run 158 m at a pace of 5.5 m/s

Explanation:

Time = Displacement / Velocity

Since everythign is already in the same terms (meters, adn seconds) we dont have to convert everything just plug it in

Time = 158 m / 5.5 m/s

time = 28.27 s

Answer:

If you want to be flexible, go to yout ube and search Anna Mcnulty. She is the best teacher for flexiblity and she is only 18!

Explanation:

When the spring is then cut into two halves and one of the halves is compressed by 0.20 m, the potential energy in the spring is 10 J.

The spring constant of the spring is the energy stored in the spring due to its elasticity.

E = ¹/₂kx²

where;

k = 2E / x²

k = ( 2 x 10 J ) / ( 0.2 m )

k = 500 N/m

When the spring is then cut into two halves and one of the halves is compressed by 0.20 m, the potential energy in the spring is calculated as;

E =  ¹/₂kx²

E =  ¹/₂(500)(0.2)²

E = 10 J

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Answer:

The frequency of the wave is 5 Hz (Hertz), which means it oscillates or cycles 5 times in one second.

Explanation:

The frequency of a wave is the number of times the wave oscillates or cycles in a given period of time. The period of a wave is the time it takes for the wave to complete one cycle.

The period of the wave is given as 0.2 seconds. To calculate the frequency, we can use the formula:

Frequency (f) = 1 / period (T)

So in this case:

f = 1 / 0.2 seconds

The frequency of the wave is 5 Hz (Hertz), which means it oscillates or cycles 5 times in one second.

Formula for frequency:

\(f=\dfrac{1}{T}\)

frequency(measured in Hertz) = 1 / period(measured in seconds)

__________________________________________________________

Given:

\(T=0.2s\)

\(f=?\)

__________________________________________________________

Finding frequency:

\(f=\dfrac{1}{T}\)

\(f=\dfrac{1}{0.2}\)

__________________________________________________________

Answer:

\(\fbox{f = 5 Hertz}\)

The density (ρh) of hot air inside the balloon, assuming it is uniform throughout, can be expressed in terms of Th, Tc  and ρc (density of surrounding air) using the ideal gas law as follows: ρh = (ρc * Tc) / Th

The ideal gas law states that for a given amount of gas, the product of its pressure (P) and volume (V) is proportional to the product of its temperature (T) and the number of moles (n). Mathematically, it can be expressed as:

PV = nRT

Where R is the ideal gas constant.

Since we are considering a balloon filled with hot air, the pressure and volume inside the balloon remain constant. Therefore, we can modify the ideal gas law to relate the densities of hot air (ρh) and surrounding air (ρc) to their respective temperatures:

(ρh * V) / Th = (ρc * V) / Tc

Here, V represents the volume of the balloon, which cancels out on both sides of the equation.

Simplifying the equation:

ρh / Th = ρc / Tc

Rearranging the equation to solve for ρh:

ρh = (ρc * Tc) / Th

The density (ρh) of hot air inside the balloon, assuming it is uniform throughout, can be calculated using the ideal gas law. The expression for ρh in terms of Th (temperature of hot air), Tc (temperature of surrounding air), and ρc (density of surrounding air) is given as: ρh = (ρc * Tc) / Th.

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We may utilize the physics of refraction to establish the true position of the fish from the point on the surface that seems to be in line with the picture of the fish.  The light beams from the fish are refracted at the water.

air contact and appear to emanate from a place above the fish's true position. We can compute the true depth of the fish using trigonometry to be roughly 1.13 meters. When a green light shines on a purple outfit, the costume turns black. This is due to the fact that purple is a mixture of red and blue light, but green light does not include any of these hues. As a result, when green light is shone on a purple item,water no color is produced. The item seems black because it corresponds to the green wavelength. The angle of incidence of the laser beam entering the glass should be larger than or equal to the critical angle of the glass to reduce losses in a fiber optic. The critical angle for a 632 nm laser beam in glass with a refractive index of 1.5 may be computed using Snell's law to be around 41.8 degrees. To eliminate reflection losses, the laser beam must enter the glass at an angle of 41.8 degrees or more.

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Answer:

yes.................

Answer:

Unbalanced forces are not examples of Newton's third law because not all opposite reactions are unbalanced forces.

Explanation:

A scientific law is an established principle that explains a phenomenon or behavior in the natural world. It is a concise statement that summarizes the results of many observations and experiments and is widely accepted as true because it has been confirmed over and over again.

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Answer: When volume is constant, pressure is directly proportional to temperature. When temperature is constant, pressure is inversely proportional to volume. When pressure is constant, volume is directly proportional to temperature.

Explanation:

When 22.0 grams of HCl are dissolved in 90.0 grams of water, a solution is created that contains 19.6% of that solution's mass.

The formula for determining the percent by mass of any substance contained in any solution is:

% mass is equal to (mass of substance / total mass of solution) 100 percent.

Therefore, 22g of HCl (solute) and 90g of water are the respective mass units (solvent)

22 + 90 = 112 g is the solution's mass.

Putting values together, we obtain % mass = (22 / 112)100% = 19.6%.

Consequently, 19.6% of the needed mass is mass.

The mass percentage that indicates the mass of solute contained in a given mass of solution can be used to characterize the composition of the solution. In terms of mass or moles, the solute's concentration is expressed.

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Answer:

b. d. f.

Explanation:

Got it right on Edge

Answer:

2. Gina gathers information about a court case.

4. Hana interviews and advises a person who has been accused of a crime.

6. Dewayne creates the paperwork for a business contract.

The convection coefficient for air flow over a steel casting is determined to be \(300 W/m^2\°C\) based on temperature measurements using thermocouples.

To determine the convection coefficient associated with air flow over the surface of the thick steel casting, we can use Newton's Law of Cooling, which relates the heat transfer rate to the temperature difference between the surface and the surrounding fluid. The equation is given as:

q = h × A × ΔT

where:

q is the heat transfer rate,

h is the convection coefficient,

A is the surface area through which heat is being transferred, and

ΔT is the temperature difference between the surface and the fluid.

In this case, we have two thermocouples inserted in the steel casting at distances of 10 mm and 20 mm from the surface. Since the casting is thick, we can assume that the temperatures measured by the thermocouples represent the temperature at those respective distances from the surface.

Given:

Thermal conductivity of steel (k) = 15 W/m.K

Temperature at 10 mm distance from the surface \((T_1)\) = 50°C

Temperature at 20 mm distance from the surface \((T_2)\) = 40°C

Air temperature (T∞) = 100°C

Now, we can calculate the temperature difference between the surface and the air:

ΔT = \(T_{surface\) - T∞

For the thermocouple at 10 mm distance:

ΔT1 = 50°C - 100°C = -50°C

For the thermocouple at 20 mm distance:

Δ\(T_2 = 40\°C - 100\°C = -60\°C\)

Next, we can calculate the temperature gradient along the thickness of the casting:

\(dT/dx = (T_2 - T_1) / (x_2 - x_1)\)

Where:

\(x_1 = 10 mm\)

\(x_2 = 20 mm\)

dT/dx = (40°C - 50°C) / (20 mm - 10 mm) = -1°C/mm

Since the thermal conductivity (k) is given, we can relate the heat transfer rate to the temperature gradient using Fourier's Law of Heat Conduction:

q = -k × A × (dT/dx)

To simplify the equation, let's assume the surface area (A) is 1 \(m^2\):

\(q = -15 W/m.K * 1 m^2 * (-1\°C/mm)\)

Now, we need to convert the temperature gradient from °C/mm to °C/m:

\(q = -15 W/m.K * 1 m^2 * (-1\°C/mm) * (1000 mm/m)\)

\(= 15000 W/m^2\)

Finally, we can use the heat transfer rate (q) and the temperature difference (ΔT) to calculate the convection coefficient (h) using Newton's Law of Cooling:

q = h × A × ΔT

\(15000 W/m^2 = h * 1 m^2 * (-50\°C)\)

\(h = -15000 W/m^2 / (-50\°C)\)

\(= 300 W/m^2C\)

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Electrons are one of the constituents of atoms. It is negatively charged particles and the atom has the same number of protons and electrons.

Matter is made up of atoms. Atoms are made up of protons, electrons, and neutrons. The protons are positively charged particles, electrons are negatively charged particles, and neutrons are neutrally charged particles. Protons and neutrons are present inside the atoms from the nucleus. The electrons are revolving around the nucleus due to attractive force.

The characteristics of the electrons are: Electrons are identified by J.J Thomson by using cathode rays. The electrons are negatively charged particles. The mass of an electron is 9.11×10⁻³¹Kg and the charge of an electron is 1.6×10⁻¹⁹C. They are the fundamental block of all atoms. Cathode beams are the source of electrons.

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PART A: A child applies a 20.0 N force tangentially to the edge of the merry-go-round for 25.0 s. If the merry-go-round is initially at rest,

what is its angular speed after this 25.0 s interval?

w=Angular acceleration is given by the formulaα = τ / Iwhereα is the angular accelerationτ is the torque and is the moment of inertia of the objectThe torque is given byτ = F × where is the force and is the radius of the object. Now, we can use the formulas:α = τ / Iω = α × twhereω is the final angular velocity is the time taken part B: How much work did the child do on the merry-go-round? The work done by the child will be equal to the change in the kinetic energy of the system. It is given by: W = Kf - Ki Where, W is the work done is the final kinetic energy and Ki is the initial kinetic energy. PART C:

What is the average power supplied by the child?

P=Power is the rate at which work is done. It is given by the formula: P = W / where is the work done and t is the time takenSubstitute the values to get the answer. PART AThe moment of inertia, I = 3000 kg/m2The radius, r = 2.70 mThe force applied, F = 20.0 NTime, t = 25.0 sTorque,τ = F × r= 20.0 N × 2.70 m= 54 NmA angular acceleration,α = τ / I= 54 Nm / 3000 kg/m2= 0.018 rad/s2Final angular velocity,ω = α × t= 0.018 rad/s2 × 25.0 s= 0.45 rad/sinus, the angular speed after 25.0 s interval is 0.45 rad/s.PART BInitial velocity, Ui = 0Final velocity, Uf =?Mass of child and merry-go-round, M =?We have the final angular velocity,ω = 0.45 rad/We can use the formula, U = R × ωwhere R is the radius of the merry-go-round. U = 2.70 m × 0.45 rad/s= 1.215 m/kinetic energy of the system, Kf = (1/2) × M × Uf2Initial kinetic energy, Ki = (1/2) × M × Ui2Since it is initially at rest, Ui = 0.Kf = (1/2) × M × Uf2Thus,W = Kf - Ki= (1/2) × M × Uf2Substitute the values to get the answer.PART CWe has the work done, W =?Time, t = 25.0 sSubstitute the values to get the answer. P = W / t=? / 25.0 s=?Thus, the average power supplied by the child is? W.

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Explanation:

it requires energy

hope it helps

The average force on the puck by the stick is 448 N

To find the average force on the hockey puck, we can use the impulse-momentum theorem:

Impulse = Change in momentum

The impulse on the puck can be calculated as:

Impulse = mass x change in velocity
Impulse = 0.16 kg x (9 m/s - (-5 m/s))
Impulse = 0.16 kg x 14 m/s
Impulse = 2.24 N*s

The change in velocity is negative because the puck is moving in the opposite direction after the impact.

The impulse on the puck is equal to the average force multiplied by the time of contact:

Impulse = average force x time
2.24 N*s = average force x 0.005 s
average force = 2.24 N*s / 0.005 s
average force = 448 N

Therefore, the average force is 448 N.

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