Which image illustrates the bouncing of a light wave off of a surface?
A
B
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A. A
B. B
C. C

A particle starts from rest and is acted on by a net force that does work at a rate that is proportional to the time t. The speed of the particle is proportional to √t.

Work is a change in kinetic energy, it should be noted. Power will therefore be determined as follows:

Power = Work / Time = force × velocity

Work = the change in kinetic energy = 1/2 mv2

If work is proportional to time:

W = t

1/2 mv2 = t

v2 = t

v (speed) = √t

Speed is the rate and direction of an object's movement, as well as the rate and duration at which an object is moving along a path. In all other positions, speed is a scalar value while pace is a vector.

Power is inversely related to t. Because the force is constant, the velocity will be a function of t. As a result, the particle's speed is proportional to √t.

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The maximum acceleration will be 4.9 m/s², if the truck has four wheels and the static friction coefficient is 1.

Let the mass of the truck, M

Let the force require to overcome the static friction is F.

Let the acceleration in the forward direction is a.

Coefficient of static friction, μ = 1

4 wheels(2 rear and 2 front wheels) will share the equal force of friction resistance. Force of friction will be equal to the forward force applied by the truck.

That will be F₁/2 = F₂/2 = F

F₁/2 = F₂/2 = μMg/2 = F

μMg/2 = Ma

a = μg/2

a = (1×9.81)/2

a = 4.9 m/s²

--The give question is incomplete, the complete question is:

"The truck has four-wheel drive, and the cabinet is wooden, what is it's maximum acceleration (in m/s2), if the coefficient of static friction is 1?"

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Exactly, 1 Joule of energy per second is what is used to define a Watt. Joules and seconds, respectively, are the SI units for time and work. A power of 1 Joule per second was used to define a Watt.

A one newton (N) force applied over a one meter distance does one joule's worth of work (or energy) (m).. To put it simply, it requires approximately 1 joule of energy to raise a 3/4 pound weight 1 foot off the ground or to drag something 1 foot using a parallel pulling force of 3/4 pound. According to this definition from physics, 1 volt is the same as 1 joule of electric potential energy divided by 1 coulomb of charge. The power unit is the watt. According to this, 1 joule of labor is completed in 1 second. It is, in essence, the ability of an appliance to use energy at a rate of 1 joule per second.

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Answer:

Explanation:

For a block understanding simple harmonic oscillation,

the maximum amplitude(A) = 7.5cm

                      A  = 0.075m

Let angular frequency be (w)

Then,max acceleration of platform = w²A……   {where, A is amplitude}

and, Fictitious force experienced by platform = mw²A

At mean position, acceleration, a=0

⇒N=mg (N = normal reaction)

Below the mean positon, acceleration is upwards (towards the mean position)

∴N−mg=ma or

 N=m(g+a)

Above the mean position, acceleration is downwards (towards the mean position)

∴mg−N=ma or

  N=m(g−a)

In this case, N decreases as 'alpha' increases. At the extreme position acceleration is maximum (=ω²A) so N is minimum. When the block leaves contact with the plank N becomes zero.

So,

       0= m(g-w²A)

       w²A=g

       w=√g/A

       w=√9.8/0.075

       w=11.43 rad/ sec

In Hz,

       w= 11.43/2π = 1.82Hz

So, maximum frequency at which the block will stay on the platform is 1.82Hz

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Let us consider a planet of mass M and radius R. A spaceship is sent to investigate it. While hanging motionless in space at a distance of 5R from the centre of the planet, the spaceship fires an instrument package of mass m, which is much smaller than the mass of the spaceship.

We need to find out the angle θ for which the package just grazes the surface of the planet. The gravitational force between the planet and the instrument package of mass mis given by,Gravity of the planet on the instrument package = G(Mm)/(r^2)Here, M is the mass of the planet and r is the distance between the planet's centre and the instrument package. Since the spaceship is stationary, the gravitational force between the planet and the spaceship is equal to the centrifugal force, and the force on the instrument package must be equal and opposite to the difference of the gravitational and centrifugal forces.

The equation of motion of the instrument package is given by,mg - G(Mm)/(r^2) + (mv^2)/r = 0where g is the acceleration due to gravity at the surface of the planet and v is the velocity of the instrument package at the surface of the planet. At the point where the package just grazes the surface of the planet, the velocity of the package is zero. Thus,(mv^2)/r = 0As the mass of the instrument package is very small, the velocity of the spaceship can be assumed to be constant. Hence, we can write,v^2 = (GM)/(5R) The above expression gives the angle θ for which the instrument package just grazes the surface of the planet.

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Answer:

A plant cell contains a large, singular vacuole that is used for storage and maintaining the shape of the cell. In contrast, animal cells have many, smaller vacuoles. Plant cells have a cell wall, as well as a cell membrane. Animal cells simply have a cell membrane, but no cell wall.

hope this helps :)

Answer:

Compare animal cell and plant cell: Both are eukaryotic cells, both contain membrane bound organelles. Both contain similar membranes such as cytosol and cytosketal elements.

Explanation:

A tablespoon is a common unit of measurement used in cooking and baking to measure volume. One tablespoon is equal to approximately 1/2 fluid ounce.

When measuring ingredients for a recipe, it's important to be precise in order to achieve the desired outcome. Knowing the equivalent measurement of a tablespoon in ounces can be helpful, especially when converting recipes from one unit of measurement to another.

One tablespoon is equivalent to approximately 0.5 ounces. This means that two tablespoons are equal to about 1 ounce. To convert tablespoons to ounces, multiply the number of tablespoons by 0.5. For example, if a recipe calls for four tablespoons of an ingredient, that is equivalent to approximately 2 ounces.

It's important to note that the conversion of tablespoons to ounces is not always exact and may vary slightly depending on the recipe and the accuracy of the measurement. However, using the conversion factor of 0.5 ounces per tablespoon is a good starting point and should provide reasonably accurate results in most cases.

In conclusion, a tablespoon is a standard unit of measurement used in cooking and baking to measure volume, and one tablespoon is equal to approximately 0.5 ounces.

To convert tablespoons to ounces, multiply the number of tablespoons by 0.5. It's important to note that the conversion of tablespoons to ounces may not always be exact and may vary slightly depending on the recipe and the accuracy of the measurement, but using the conversion factor of 0.5 ounces per tablespoon is a good starting point.

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Answer:

Explanation:

2F-F=ma, so F=ma or .17=(13x10-3kg)a then a=13.07m/s2

The initial acceleration will be 13.08 \(m/s^{2}\)

Therefore,

The above equation says that the acceleration, a, is equal to the difference between the initial and final velocities, \(v_{f} -v_{i}\)

divided by the time Δt.

The initial acceleration will be 13.08 \(m/s^{2}\)

F=ma, where

F is Force, F net= 0.17 N

m is the mass of the object, m= 13 g= 0.013 kg

a is acceleration, a =?

0.17= (0.013 kg) × a

⇒ a = \(\frac{0.17}{0.013} = 13.08 m/s^{2}\)

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Answer:

d. 0.48

Explanation:

The example provided, where Isaac Newton showed that the same laws govern motion in both realms of Earth and space, best fits the theory of explanation known as Causal Unifications'.

Causal Unifications theory aims to explain phenomena by identifying common causes or underlying principles that apply to seemingly distinct phenomena. In this case, Newton's discovery of the laws of motion demonstrated that the same fundamental principles govern both celestial and earthly motion.

To summarize, the example of Isaac Newton demonstrating that the same laws govern motion on Earth and in space aligns with the Causal Unificationist theory of explanation, which seeks to identify common causes or underlying principles that apply to seemingly distinct phenomena. By discovering the laws of motion, Newton provided a unified explanation for motion in both realms, challenging the previous belief in separate laws for celestial and earthly motion.

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Momentum=mass*velocity=40,000*11=440,000 kg m/s.

The word "momentum" is frequently used in sports. A squad that is moving forward and has momentum will be difficult to stop. A team that is genuinely moving forward and gaining momentum will be challenging to stop.

A physics phrase, momentum describes the amount of motion that an item has. The momentum belongs to a sports team that is actively playing. An object has momentum if it is moving or in motion.

The definition of momentum is "mass in motion." Since every item has mass, if it is moving, it must have momentum because its mass is in motion.

Therefore, Momentum=mass*velocity=40,000*11=440,000 kg m/s.

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Graph A does.

The work you do to carry the ball up to the top of the cliff is the total energy it has.

Before you drop it, all that energy is potential energy.  

Once you drop it, the potential energy starts to turn into kinetic energy as it falls.  

When it hits the ground, its kinetic energy is exactly the amount of potential energy it had at the top, and it has no more potential energy.

The total (potential + kinetic) energy is the same amount all the way down. Energy isn't created or destroyed.

The graph that shows the ball's total energy and the elapsed time as the ball falls to the ground is graph A.

For a body that is falling from a height, the potential energy of the body is being converted to kinetic energy. We must note that the total mechanical energy of the body is constant.

As such, the graph that shows the ball's total energy and the elapsed time as the ball falls to the ground is graph A.

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The wavelength = v/f in a medium and the wavelength 0 = c/f in vacuum are related when the preceding velocity expression is combined with the definition of index of refraction:

Because frequency does not vary as light travels from one medium to another, it cancels out in the equation above. A block of Lucite is exposed to a laser beam incident from the air with a vacuum wavelength of 632.8 nm. The photograph's line of sight is parallel to the plane in which light travels. Refractive index is also equal to c/v, or the ratio of the speed of a particular wavelength of light in a vacuum to that same wavelength's speed in a substance.

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The force constant of the spring is 30.6N and the unloaded length of the spring is 0.57m.

The force constant (k) of the spring is calculated by the equation

k = (mass× gravity) / (change in length).

In this question, the mass is the difference between the two masses (2.10 kg - 0.300 kg = 1.800 kg),

And the change in length is the difference between the two lengths (0.750 m - 0.180 m = 0.570 m).

Therefore, the force constant of the spring is

(1.800 kg × 9.8 m/s²) / (0.570 m) = 30.6 N/m.

The unloaded length of the spring is determined by subtracting the length of the spring when the 0.300 kg mass hangs from it (0.180 m) from the length of the spring when the 2.10 kg mass hangs from it (0.750 m). Therefore, the unloaded length of the spring is

0.750 m - 0.180 m = 0.570 m.

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An example of gas is Air.

Common examples of gases are oxygen, carbon dioxide nitrogen hydrogen helium steam dry ice, etc. Gases are considered much less dense than solids and liquids because the particles they contain are much more dispersed. It's a mixture of different gases. The air in Earth's atmosphere is composed of approximately 78% nitrogen and 21% oxygen.

Air also contains small amounts of other gases such as carbon dioxide neon and hydrogen. Gas is a sample of matter that conforms to the shape of the container and assumes a uniform density within the container, regardless of the amount of matter in the container, even in the presence of gravity. Gas is a substance that is completely gaseous at normal temperature and pressure.

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Answer:

Gravitational potential energy = (mass) x (gravity) x (height)

Kinetic energy (of a moving object) = (1/2) (mass) x (speed)²

When the pendulum is at the top of its swing, its potential energy is

(mass) x (gravity) x (height)

= (5 kg) x (9.8 m/s²) x (0.36 m)

= (5 x 9.8 x 0.36) joules

17.64 joules .

Energy is conserved ... it doesn't appear or disappear ... so that number is exactly the kinetic energy the pendulum has at the bottom of the swing, only now, it's kinetic energy:

17.64 joules = (1/2) x (mass) x (speed)²

17.64 joules = (1/2) x (5 kg) x (speed)²

Divide each side by 2.5 kg:

17.64 joules / 2.5 kg = speed²

Write out the units of joules:

17.64 kg-m²/s² / 2.5 kg = speed²

(17.64 / 2.5) (m²/s²) = speed²

7.056 m²/s² = speed²

Take the square root of each side: Speed = √(7.056 m²/s²) = 2.656 m/s.

Looking through the choices, we're overjoyed to see that one if them is ' 2.7 m/s '. Surely that's IT !

Hope this will help you ...

Answer:

Explanation:

speed of sound in 24 degrees celsius

345.48m/s

hence 345.48m/s x 3s = 1036.44m

Answer:

200

Explanation:

has to be long this us just random words anseer is b. 100

Answer:

60m/s

Explanation:

momentum = Mass × Velocity

Initial Momentum = 12 × 10

= 120

Final Momentum = 12×15

=180

Change in Momentum = 180 - 120

= 60m/s

Answer:

Explanation:

formula for change in momentum = F =∆p/∆t

F∆t = ∆p

∆p = m(v - Vo)

∆p = 12(15-10)

=12(5)= 60

Answer:

Direct current

Explanation:

Because it cannot reverse, and it's optimum for usage by electric home appliances.

Unlike Alternating current which reverses, and can cause electric appliances to burn out.

Answer:

The resultant force working on the helicopter can be calculated using the formula:

Resultant force = mass x acceleration

We know that the mass of the helicopter is 3000 kg and the acceleration is the acceleration due to gravity, which is 10 m/s^2.

The force of lift that opposes the weight of the helicopter is equal to:

Resultant force = 3000 kg x (10 m/s^2 + 25 m/s^2)

Resultant force = 3000 kg x 35 m/s^2 = 105,000 N

So the resultant force working on the helicopter is 105,000 N, this is the force that the helicopter's engines need to exert to overcome the force of gravity and maintain its constant speed of 25m/s.

The following information is provided in the problem: A sled with a weight of 19.7 kg is pulled with a force of 42.0 N at an angle of 43.0° across ground where μ₁ = 0.130. We need to find out the normal force that is exerted on the sled.

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Let us assume that the initial direction of the ball, i.e., from the pitching machine to the batter as the negative direction, and the final direction of the ball is the positive direction.

Given,

The mass of the baseball, m=0.148 kg

The initial velocity of the baseball, u=-26 m/s

The final velocity of the baseball, v=39 m/s

The momentum of the ball before the batter hits it is given by,

On substituting the known values,

The momentum of the ball after the batter hits it is given by,

On substituting the known values,

The change in the momentum is given by,

On substituting the known values,

Thus the change in the momentum of baseball is 9.62 kg·m/s

This is true because the process of dry ice sublimating and the puddle freezing both involve chemical bonds breaking.

In the case of dry ice (solid CO2), the sublimation process occurs when the CO2 molecules absorb enough energy to break the bonds holding them together in a solid state. This energy is supplied by the surrounding air, causing the CO2 to transition directly from a solid to a gas.

In the case of the puddle freezing, the water molecules lose energy and slow down, allowing hydrogen bonds to form between the molecules. As more and more bonds form, the liquid transitions to a solid (ice). The breaking of hydrogen bonds in the liquid and the formation of new bonds in the solid are chemical processes that represent a breaking and forming of chemical bonds.

"

Complete and correct question

I dry ice sublimating and becoming a ga and a puddle freezing into ice on a clod night both involve chemical bond breaking

True or false

"

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The statement "serving size is based on the amount of food that is customarily eaten at one time" is true.

Serving sizes are designed to represent the typical portion of a food item that an individual would consume in a single sitting. These sizes are often standardized across various types of food products to provide consumers with a consistent and reliable means of understanding and comparing the nutritional content of the items they consume.

To explain this further, serving sizes are determined by regulatory agencies and are based on average consumption data. They serve as a basis for the nutritional information presented on food labels, helping people to better understand how the food they eat contributes to their daily nutritional intake. This information is essential for making informed choices about the foods they consume and maintaining a healthy and balanced diet.

In conclusion, serving sizes provide an essential reference point for individuals to assess the nutritional content of their meals and make informed decisions about their dietary habits. By basing serving sizes on the amount of food that is customarily eaten at one time, these measurements offer a practical and accurate way for consumers to understand the impact of their food choices on their overall health and well-being.

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Answer:

D. None of the the statements above are correct.

Explanation:

Microscopes and telescopes are major instruments that have contributed hugely to our current understanding of the micro- and macroscopic worlds. The invention of these devices led to numerous discoveries in disciplines such as physics, astronomy, and biology, to name a few. In this section, we explain the basic physics that make these instruments work.

Answer:

d. is the answer hope it helps

When electrons are emitted from the cathode, they can have zero velocity, one velocity, or a range of velocities depending on the conditions under which they are emitted.

For example, in a vacuum tube, electrons are emitted from the cathode due to thermionic emission and they typically have a range of velocities.

However, in a photoelectric effect experiment, electrons are emitted from the cathode due to the absorption of photons and they typically have a well-defined velocity determined by the energy of the incident photons.

Similarly, in a field emission experiment, electrons are emitted from the cathode due to a high electric field and they typically have a high velocity.

Therefore, the velocity of the electrons emitted from the cathode depends on the mechanism of emission and the conditions under which they are emitted.

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. For a diode with Jsc = 42 mA/cm² at 120 mW solar power, the estimated conversion efficiency at 300K is 19.5%.

In order to calculate the solar cell conversion efficiency, we need to know the value of Voc (open circuit voltage) and the value of Isc (short circuit current) of the diode as a solar cell.

Assuming that the diode has an ideal diode equation, we can use the following equations to calculate Voc and Isc:

Voc = (kT/q)ln(Iph/I0 + 1)
Isc = Iph

where k is the Boltzmann constant, T is the temperature in Kelvin, q is the elementary charge, Iph is the photocurrent generated by the solar radiation, and I0 is the diode saturation current.

Since we know that Jsc = 42 mA/cm² at 120 mW solar power, we can calculate the photocurrent as:

Iph = Jsc * (area of diode) = 42 * 10⁻³ * (1 cm²) = 0.042 A

Assuming an ideality factor of 1, we can estimate I0 as:

I0 = Isc / exp(qVoc / kT) = 0.042 / exp(qVoc / kT)

Solving for Voc, we get:

Voc = (kT/q)ln(Isc / I0 + 1) = (kT/q)ln(1 + Isc / 0.042)

Substituting the values, we get:

Voc = (1.38 * 10⁻²³ * 300 / 1.6 * 10⁻¹)ln(1 + 42 / 0.042) = 0.56 V

Therefore, the solar cell conversion efficiency can be calculated as:

Efficiency = (Pout / Pin) = (Isc * Voc / Pin) = (0.042 * 0.56 / 0.12) = 19.5%



The solar cell conversion efficiency of a diode used as a solar cell can be calculated using the values of open circuit voltage (Voc) and short circuit current (Isc). Assuming an ideal diode equation, we can estimate the values of Voc and Isc using the values of photocurrent generated by the solar radiation and the diode saturation current. Once we have these values, we can calculate the conversion efficiency as the ratio of output power to input power. For a diode with Jsc = 42 mA/cm² at 120 mW solar power, the conversion efficiency at 300K is estimated to be 19.5%.


In conclusion, a diode can be used as a solar cell and the solar cell conversion efficiency can be calculated using the values of Voc and Isc. Assuming an ideal diode equation and estimating the values of photocurrent and diode saturation current, we can calculate the values of Voc and Isc and then estimate the conversion efficiency as the ratio of output power to input power. For a diode with Jsc = 42 mA/cm² at 120 mW solar power, the estimated conversion efficiency at 300K is 19.5%.

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At constant temperature pressure is inversely proportional to volume, so pressure will increase.

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