Anybody good in physics topic WAVE?

A converging lens, also known as a positive lens, is a type of lens that has the ability to focus light rays to a single point, known as the focal point. This property can be utilized to ignite a piece of carbon paper.

When using a converging lens to burn carbon paper, care must be taken to position the lens such that sunlight (or another light source) is focused on the paper. As the light is focused, its intensity rises until it eventually reaches a temperature high enough to burn the carbon paper. The lens serves as a magnifying glass in this process, focusing the light beams onto a pinpoint area of the carbon paper and creating heat that eventually ignites the paper.

The size and temperature of the point of ignition will depend on the lens's distance from the paper, its size, and the angle at which the light rays are directed. The "fire by reflection" or "camera obscura" principle refers to this phenomenon. The principle of refraction, which asserts that light changes direction as it passes through various media with differing refractive indices, can be demonstrated in this way.

It is feasible to create a concentrated point of heat hot enough to ignite the carbon paper by employing a converging lens to focus the light.

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The elastic potential energy stored in the spring is 2.8611 J

Given- Force constant= 5.5 N/m

length of spring= 2.50m

Elongation = 3.52m

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Answer:

brokies+99+00+00=00

Explanation:

An automobile battery has more mass as compared to a king-size pillow.

Mass is defined as the measure of the amount of matter contained in a body. On the other hand, weight is defined as the amount of force particularly gravitational force acting on a body.

Although the weight of the same body can be different for different cases which if were the case we couldn't use weight to tell which body has more mass, but here we are considering the weight is being compared in identical conditions and hence, the body which has more weight has more mass. Which in our case is a car battery.

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The gravity of the planet is be determined from Newton's law of universal gravitation as 7.48 m/s².

The gravity of the planet can be determined by applying Newton's second law and Newton's law of universal gravitation.

F = mg = GmM/R²

g = GM/R²

where;

g = (6.67 x 10⁻¹¹ x 6.9 x 10²⁴)/( 7844000²)

g = 7.48 m/s²

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Answer:

Explanation:

The mass of the object can be found by using the formula

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

f is the force

a is the acceleration

From the question we have

\(m = \frac{44}{15.3} \\ = 2.875816...\)

We have the final answer as

Hope this helps you

Answer:

2.9

Explanation:

In the equation you get 2.88 but you round that to the nearest tenth so you get 2.9

The correct answer is B. brighter. Absolute magnitude is the measure of the intrinsic brightness of a star.

It is defined as the apparent magnitude a star would have if it were located at a distance of 10 parsecs (32.6 light-years) from Earth.If two stars have the same absolute magnitude, it means they have the same intrinsic brightness. However, the apparent brightness of a star depends not only on its intrinsic brightness but also on its distance from Earth. The farther a star is, the fainter it appears.In this scenario, star A is nearer, which means it is closer to us and, therefore, appears brighter than star B, even though they have the same absolute magnitude.

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The speeds of the vertically launched sphere and horizontally launched sphere will not necessarily be the same when they hit the floor, even if they are launched from the same height and at the same initial speed.

When a sphere is launched vertically upwards, it will slow down due to the force of gravity acting against it, until it reaches the highest point of its trajectory and momentarily stops. Then, it will accelerate back downwards towards the ground, increasing in speed until it hits the floor. The speed at which it hits the floor will depend on its initial speed, the height it was launched from, and the acceleration due to gravity.

On the other hand, when a sphere is launched horizontally, it will continue to move at a constant speed in the horizontal direction, while also being accelerated downwards due to the force of gravity. The resulting motion is a projectile motion with a parabolic trajectory. The speed at which it hits the floor will depend on its initial horizontal speed, the height it was launched from, and the acceleration due to gravity.

Therefore, the speeds of the vertically and horizontally launched spheres when they hit the floor will depend on a variety of factors and cannot be determined without more information about the specific conditions of the launches.

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4.21 mH is the self-inductance of the inductor.

A passive two-terminal electrical device known as an inductor, also known as a coil, choke, or reactor, stores energy in a magnetic field as electric current passes through it. According to Faraday's law of induction, the time-varying magnetic field generates an electromotive force (e.m.f.) (voltage) in the conductor as the current through the coil varies. Lenz's law states that the induced voltage has an opposing polarity (direction) to the change in current that caused it. Inductors so reject any changes in the current flowing through them. Inductance, which is the ratio of voltage to current change rate, is a property of inductors.

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A skydiver weighing 180 lb (including equipment) falls vertically downward from an altitude of 5000 ft and opens the parachute after 10 s of free fall. Assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.75|v| when the parachute is closed and is of magnitude 12|v| when the parachute is open, where the velocity v is measured in ft/s.

a. The speed of the skydiver when the parachute opens is 71.06 m/s.

b. The distance fallen before the parachute opens is 1,610 ft.

c. The limiting velocity \(v_L\) after the parachute opens is 66.71 m/s.

a. To find the speed of the skydiver when the parachute opens, we can use the concept of net force and Newton's second law of motion. The net force acting on the skydiver is given by:

\(F_n_e_t = m * a,\)

where \(F_n_e_t\) is the net force, m is the mass of the skydiver, and a is the acceleration.

Initially, during free fall, the net force is the difference between the weight of the skydiver and the force of air resistance:

\(F_n_e_t = m * g - F_a_i_r\)

where g is the acceleration due to gravity.

When the parachute opens, the force of air resistance changes to 12|v|, where v is the velocity of the skydiver.

For free fall:

\(m * g - F_a_i_r_c_l_o_s_e_d = m * a,\)

When the parachute opens:

\(m * g - F_a_i_r_o_p_e_n = m * a,\)

Since both equations are equal to m * a, we can set them equal to each other:

\(m * g - F_a_i_r_c_l_o_s_e_d = m * g - F_a_i_r_o_p_e_n\\F_a_i_r_o_p_e_n - F_a_i_r_c_l_o_s_e_d = m * g\).

Substituting the given values:

12|v| - 0.75|v| = 180 lb * g,

11.25|v| = 180 lb * g.

Converting the weight from lb to kg:

m = 180 lb * (1 kg / 2.205 lb) ≈ 81.63 kg.

Converting the acceleration due to gravity from ft/s² to m/s²:

g = 9.8 m/s².

11.25|v| = 81.63 kg * 9.8 m/s².

Solving for |v|:

|v| = (81.63 kg * 9.8 m/s²) / 11.25 ≈ 71.06 m/s.

Therefore, the speed of the skydiver when the parachute opens is approximately 71.06 m/s.

b. To find the distance fallen before the parachute opens, we can use the equation of motion:

\(d = v_0 * t + (1/2) * a * t^2\)

where d is the distance fallen, \(v_0\)is the initial velocity, t is the time, and a is the acceleration.

In this case, the skydiver falls for 10 s with an initial velocity of 0 ft/s and an acceleration of g. Substituting the values:

d = 0 ft/s * 10 s + (1/2) * (32.2 ft/s²) * (10 s)² ≈ 1,610 ft.

Therefore, the distance fallen before the parachute opens is approximately 1,610 ft.

c. The limiting velocity (\(v_L\)) is the maximum velocity the skydiver can reach after the parachute opens. It occurs when the force of air resistance is equal in magnitude to the weight of the skydiver.

\(m * g = F_a_i_r_o_p_e_n.\)

Substituting the given values:

180 lb * g = 12|\(v_L\)|.

Simplifying the equation:

|\(v_L\)| = (180 lb * g) / 12.

Converting the weight from lb to kg:

m = 180 lb * (1 kg / 2.205 lb) ≈ 81.63 kg.

Converting the acceleration due to gravity from ft/s² to m/s²:

g = 9.8 m/s².

|\(v_L\)| = (81.63 kg * 9.8 m/s²) / 12 ≈ 66.71 m/s.

Therefore, the limiting velocity (\(v_L\)) after the parachute opens is approximately 66.71 m/s.

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Answer:

Explanation:

Condensing is the word used to indicate the change of state of a substance from vapor to liquid, as in this case. During condensation, the substance releases thermal energy to the environment, therefore the kinetic energy of the molecules in the vapor decreases until they become closer to each other and they start to be affected by the intermolecular forces and so the substance becomes a liquid.

Answer:

False

Explanation:

Therefore, the greatest upward acceleration the elevator can have is approximately 25 m/s².

To determine the greatest upward acceleration the elevator can have, we need to consider the forces acting on it.

The force exerted by the cable is equal to the weight of the elevator, which can be calculated as the mass multiplied by the acceleration due to gravity (9.8 m/s²):

Force = Mass × Acceleration due to gravity

Force = 600 kg × 9.8 m/s²

Force = 5880 N

Since the cable can exert a maximum upward force of 15,000 N, the force exerted by the cable should be equal to or less than this maximum value:

Force ≤ 15,000 N

So we have:

5880 N ≤ 15,000 N

To find the maximum upward acceleration, we rearrange the equation:

Acceleration = Force ÷ Mass

Acceleration = 15,000 N ÷ 600 kg

Acceleration ≈ 25 m/s²

Therefore, the greatest upward acceleration the elevator can have is approximately 25 m/s².

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If the height of the image formed is 4cm, the distance of the image from the mirror is - 24 cm

According to mirror formula,

\(\frac{1}{f} = \frac{1}{v} + \frac{1}{u}\)

f = Focal length

v = Image distance

u = Object Image distance

m = Magnification

\(h_{o}\) = Object height

\(h_{i}\) = Image height

f = - 8 cm

u = - 12 cm

\(h_{o}\) = 2 cm

\(h_{i}\) = 4 cm

1 / ( - 8 ) = 1 / v - 1 / 12

1 / v = - 1 / 24

v = - 24 cm

The formula used to relate focal length with image and object length is mirror formula. This formula can be used for both plane mirror and spherical mirrors such as concave and convex mirrors.

Therefore, the distance of the image from the mirror is - 24 cm

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The direction of the 'true' wind is Southwest.

The 'true' wind direction in which a sailor is sailing can be calculated using the apparent wind and the boat's velocity. If a sailor sailing due north at 5 knots observes an apparent wind moving at 5 knots directly from the boat's starboard side (i.e. at 90°), the direction of the 'true' wind can be calculated as follows:

Let us assume the angle between the direction the sailor is sailing and the direction of the apparent wind is θ. Applying the law of cosines:

5² = 5² + V² - 2 × 5 × V × cosθ ⇒ V² - 10V cosθ + 20 = 0

Solving this quadratic equation for V, we get:

V = 10 cosθ ± √(100 cos²θ - 80)

Since the velocity of the boat is 5 knots and that of the apparent wind is also 5 knots, the true wind velocity can be expressed as the hypotenuse of a right-angled triangle with the legs equal to 5 knots.

The direction of the 'true' wind will be the direction from which the wind blows. Let us assume that the direction of the 'true' wind is Φ. Using the law of sines:

5 / sinθ = V / sin(180 - (θ + Φ)) ⇒ sin(θ + Φ) = (5 / V) sinθ ⇒ sin(θ + Φ) = [5 / (10 cosθ + √(100 cos²θ - 80))] sinθ

The direction of the 'true' wind can be calculated as follows:

True wind direction = 90 - Φ

If we substitute Φ in this equation, we get:

True wind direction = 90 - sin⁻¹[(5 / (10 cosθ + √(100 cos²θ - 80))) sinθ]

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Answer:

If it is a true mixture, the mixing enthalpy is negligible, and there is no reaction or phase change, then you can do this using exclusively the temperatures of the individual compounds and their heat capacities. Any other process that takes place needs to be taken into account separately.

The solution can be found by understanding that we’re only using state variables. You can design any complicated process that starts with the starting situation and ends up at the ending situation, and the state variables will be the same. And sometimes a complicated process is easier to calculate than the simple one-step process, like here when mixing multiple components.

One way that will work is to start by bringing all compounds to the lowest temperature of either of the compounds. All but one of the compounds must be cooled down for this; make sure to calculate for each of the components how much energy is released. Now, mix all the components together. In the simplest situation sketched above you can calculate the heat capacity of the mixture by adding all the heat capacities of the components. Use this total heat capacity to calculate how much you can heat up the mixture using the energy you saved in cooling down the components earlier. This will be your desired end situation.

In case there are any phase changes or other processes in between, you need to take the energy needed for those into account too but in very similar ways.

The correct answer is SCALE.

Reason:

This is because the experimental data you are interested in is mass and scale is the instrument that is used to measure mass. To use the scale, measure the mass of your water before you put it inside the sun and measure the mass again after you remove it from the sun. The difference in mass is the quantity of water that is evaporated.

There are different type of scale and the one that you use will depend on the size of the material that you want to measure.

How do we gather data from an experiment?

Experiments are carried out for researchers to collect data. These data then can be analysed or processed to produce meaningful conclusions. There are four major ways to collect data: surveys, observation, computer simulation and experiment.

What are the two examples of data gathering methods for experimental research?

Observational Study. This type of study is carried out over a long period.

Simulations. This procedure uses mathematical, physical, or computer models to replicate a real-life process or situation. ...

Surveys.

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The Dynamic Systems Theory (DST) of motor development proposes that developmental changes result from a complex interplay of many forces rather than from the acquisition of particular steps or stages.

The core idea of the DST is that sophisticated movements like walking do not appear all at once, but rather evolve through gradual changes in the underlying components of the behavior, such as changing muscle activity, improved posture and a decrease in the number of errors made. According to the DST, the appearance of developmental accomplishments is the result of subtle interactions between cognitive strategies, motor activities, environmental conditions and the individual's set of motor skills.

To put it another way, the DST is about learning to coordinate sophisticated behaviors in response to the changing requirements of the task, the environment, and one's own motor abilities. Ultimately, the DST helps explain motor development by viewing it as part of an overarching and evolving system comprised of multiple parts and influences.

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Complete question is :

explain what is according to the dynamic systems theory of motor development?

Answer:

Work is ability if application of energy.

Such as pushing a wheel barrow through a distance ( Newton's third law )

Work is the ability to do something.

Answer:

0.000000002 m=2.0*10⁻⁹ m

Explanation:

Scientific notation allows us to write very large or very small numbers in abbreviated form. This notation simply consists of multiplying by a power of base 10 with a positive or negative exponent.

A number written in scientific notation has the form:

a*10ⁿ

where:

So to write the number 0.000000002 in scientific notation, the following steps are performed:

So, you get: 0.000000002 m=2.0*10⁻⁹ m

The antenna is a tool to transmit and receive electromagnetic waves. It is shaped into a specific design to radiate electromagnetic energy. It has a null zone that represents an area in the radiation pattern.

The following is the complete response to the queries:

1. The function of an antenna is to transmit and receive electromagnetic waves.

2. Wire antennas are made of conductive wire that is shaped into a specific design to radiate electromagnetic energy. Aperture antennas use an opening in a conductive surface to radiate or receive electromagnetic waves.

3. Reflector antennas use a curved surface to reflect electromagnetic waves toward the direction of interest.

4. The main purpose of array antennas is to increase the directivity and gain of an antenna system by combining multiple antennas.

5. Side lobes are the undesirable radiation patterns that occur on the sides of the main lobe in an antenna's radiation pattern.

6. The null zone represents an area in the radiation pattern where the radiation intensity is at its minimum.

7. The stray factor is a measure of how much of the energy radiated by an antenna is lost due to factors like impedance mismatch or other inefficiencies. Beam efficiency is a measure of how much of the energy radiated by an antenna is directed toward the main lobe.

8. Gain is a measure of how much an antenna amplifies the incoming signal compared to a reference antenna. Directivity is a measure of how well an antenna concentrates the radiated energy in a particular direction.

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Answer:

Solution given:

frequency[f]=60,500,000Hz

velocity[V]=300,000,000m/s

wave length=?

we have

wave length=\( \frac{V}{f} \)

=\( \frac{300,000,000}{60,500,000} \)

=\( \frac{3000}{605} \)=4.96 m

Option A.4.96m

Answer:

4.96

Explanation:

Wavelength = Speed ( velocity ) over Frequency

If frequency = 60,500,00 and Velocity = 300,000,000

Then, Wavelength = \(\frac{300,000,000}{60,500,00}\) which is equivalent to 4.96

a. Her reaction time is approximately 0.256 seconds.

b. The estimated minimum average speed of nerve impulses from her eye to her brain and then to her hand is approximately 3.801 m/s.

a. To calculate the reaction time, we need to consider the time it takes for the meterstick to fall. We can use the equation of motion for free fall:

h = (1/2) * g * \(t^{2}\)

Where:

h = height fallen (0.32 m)

g = acceleration due to gravity (approximately 9.8 m/\(s^{2}\))

t = time taken (reaction time)

Rearranging the equation to solve for t:

t = \(\sqrt{(2h / g)}\)

Substituting the given values:

t = \(\sqrt{(2 * 0.32 m / 9.8 m/s^2)}\)

t ≈ 0.256 s

Therefore, her reaction time is approximately 0.256 seconds.

b. To estimate the minimum average speed of nerve impulses from her eye to her brain and then to her hand, we need to calculate the total distance traveled and divide it by the total time taken.

Distance from eye to brain = 0.074 m

Distance from brain to hand = 0.9 m

Total distance = 0.074 m + 0.9 m = 0.974 m

Total time = reaction time = 0.256 s (from part a)

Average speed = Total distance / Total time

Average speed = 0.974 m / 0.256 s

Average speed ≈ 3.801 m/s

Therefore, the estimated minimum average speed of nerve impulses from her eye to her brain and then to her hand is approximately 3.801 m/s.

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Gas X, when held in a sealed chamber at STP, will have an approximate volume of 22.4 L.

At STP (Standard Temperature and Pressure), which is defined as 0 degrees Celsius (273.15 Kelvin) and 1 atmosphere of pressure, one mole of any ideal gas occupies a volume of 22.4 liters. This is known as the molar volume of a gas. It is a constant value that allows us to easily calculate the volume of a given amount of gas at STP.

The molar volume of 22.4 liters can be derived from the ideal gas law equation, PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature. At STP, the pressure is 1 atmosphere, and if we assume we have one mole of Gas X, we can rearrange the equation to solve for V:

V = (nRT) / P

Substituting the values for STP (n = 1 mole, R = 0.0821 L·atm/mol·K, P = 1 atm, T = 273.15 K) into the equation, we get:

V = (1 mol * 0.0821 L·atm/mol·K * 273.15 K) / 1 atm

 = 22.4 L

Therefore, the approximate volume of Gas X in a sealed chamber at STP is 22.4 L.

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Answer:

 P /K = 1,997 10⁻³⁶  s⁻¹

Explanation:

For this exercise let's start by finding the radiation emitted from the accelerator

       \(\frac{dE}{dt}\) = \(\frac{q^{2} a^{2} }{6\pi \epsilon_{o} c^{2} }\)

the radius of the orbit is the radius of the accelerator a = r = 0.530 m

let's calculate

       \frac{dE}{dt} = [(1.6 10⁻¹⁹)² 0.530²] / [6π 8.85 10⁻¹² (3 108)³]

      P= \frac{dE}{dt}= 1.597 10⁻⁵⁴ W

Now let's reduce the kinetic energy to SI units

       K = 5.0 10⁶ eV (1.6 10⁻¹⁹ J / 1 eV) = 8.0 10⁻¹⁹ J

the fraction of energy emitted is

      P / K = 1.597 10⁻⁵⁴ / 8.0 10⁻¹⁹

      P /K = 1,997 10⁻³⁶  s⁻¹

Answer:

Anyone can sit in a corner office and delegate tasks, but there is more to effective leadership than that. Effective leaders have major impacts on not only the team members they manage, but also their company as a whole. Employees who work under great leaders tend to be happier, more productive and more connected to their organization – and this has a ripple effect that reaches your business's bottom line

Explanation:

:)

Answer:

Mechanics: A branch of physics in which we study about the object and properties of an object in form of a motion under the action of the force.