For a skateboard with a negative acceleration, which of the following statements is always true?

1. The initial velocity of the skateboard will be greater than it’s final velocity.
2. The skateboard will have a negative displacement.
3. The final velocity of the skateboard will be positive.
4. The final velocity of the skateboard will be negative
5. The skateboard is losing speed

Polymers that have grafting refer to the process of attaching a side chain or branch to the main polymer chain, resulting in a branched structure.

This branching can occur at multiple points along the main chain, resulting in a complex and highly branched structure. On the other hand, polymers that have branching refer to the natural occurrence of branches along the main polymer chain, without the addition of side chains.

This branching can occur randomly, resulting in a more linear or slightly branched structure. polymers with grafting involve the intentional addition of side chains to the main chain, resulting in a highly branched structure, while polymers with branching refer to the natural occurrence of branches along the main chain.

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Answer:

To answer your question:

a) The formula to calculate the number of wavelengths within a laser pulse is:

number of wavelengths = pulse duration / wavelength

Plugging in the values given in the question, we get:

number of wavelengths = 38 ps / 1062 nm

Converting picoseconds to seconds and nanometers to meters, we get:

number of wavelengths = 38 x 10^-12 s / 1062 x 10^-9 m

number of wavelengths = 0.0358

Therefore, there are approximately 0.0358 wavelengths within the laser pulse.

b) To fit only one wavelength, the pulse duration would need to be equal to the wavelength. The formula to calculate the pulse duration is:

pulse duration = wavelength

Plugging in the value given in the question, we get:

pulse duration = 1062 nm

Converting nanometers to picoseconds using the speed of light ©, we get:

pulse duration = wavelength / c

pulse duration = 1062 x 10^-9 m / 3 x 10^8 m/s

pulse duration = 3.54 x 10^-12 s

Therefore, the pulse would need to be approximately 3.54 ps long to fit only one wavelength.

I hope this helps

The change in the momentum of the ball after the ball bounces back at a speed of 10 m/s, given that its initial speed is 10 m/s is 5 Ns (option A)

First, we shall list out the given parameters from the question. Details below:

The change in the momentum of the ball can be obtained as follow:

Change in momentum = m(v + u) (since there is a rebound)

Change in momentum = 0.25 × (10 + 10)

Change in momentum = 0.25 × 20

Change in momentum = 5 Ns

Thus, we can conclude that the change in the the momentum of the ball is 5 Ns (option A)

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Answer: yes

Explanation:

yes

The density of the object is 1203 kg/m³.

Density is degree of consistency measured by the quantity of mass per unit volume.

Given,

Weight in Air = 94.1 N

Weight in water = 15.8 N

We need to calculate the volume of the object

using formula of buoyant force

Fb = W(air) - W(water) = 94.1 - 15.8 = 78.3 N

Fb = ρgh

Put the value into the formula

78.3 = 1000 X V X 9.8

V = 78.3/(1000X9.8) = 7.98 X 10⁻³

To calculate density

using the formula of buoyant force

Fb = ρVg

ρ = Fb/Vg = 78.3/(7.98 X 10⁻³ X 9.8) = 1203 kg/m³

Therefore, density of the object is 1203 kg/m³

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The blue spaceship will appear blue-shifted to you.

The phenomenon of blue-shifting occurs when an object, such as the blue spaceship in this scenario, is moving toward an observer at a high rate of speed.

Due to the Doppler effect, the wavelengths of light emitted by the moving object get compressed, resulting in a shift towards shorter wavelengths, which corresponds to the blue region of the electromagnetic spectrum. As a result, the light from the blue spaceship will appear bluer or bluer than it would if the spaceship were stationary or moving away at a slower speed.

This blue-shifted appearance is a consequence of the relative motion between the observer and the spaceship, and it is similar to how the pitch of a siren or the sound of a car engine alters as it approaches you.

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Answer:

blue

Explanation:

blue is the only color being reflected, meaning it's the only one that will be visible

Megan drives her car 2.0 km to the gas station, 4.0 km to the shopping mall to drop her mother off, and 4.5 km back home. The trip takes 20.0 min. Megan's average speed for the entire trip is 4.38 m/s. Option C is correct.

To calculate average speed, we divide the total distance traveled by the total time taken. In Megan's case, she drives 2.0 km to the gas station, 4.0 km to the shopping mall, and 4.5 km back home, totaling 10.5 km. The trip takes 20.0 minutes, which is equivalent to 20.0/60 = 0.333 hours.

To find the average speed in m/s, we need to convert the distance to meters and the time to seconds. Since\(1 km = 1000 m\) and \(1 hour = 3600 s\), Megan's total distance is 10.5 km × 1000 m/km = 10500 m, and the total time is 0.333 hours × 3600 s/hour = 1198.8 s.

Now, we divide the total distance by the total time: 10500 m / 1198.8 s ≈ 8.75 m/s.

Therefore, Megan's average speed for the entire trip is approximately 8.75 m/s.

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Answer:

200kg is the answer to the question

Option d is correct. all of the above. In projecting statements, the analyst makes judgments about various aspects of the firm's financial decisions and strategies, including working capital policies, cash reserves, and capital expenditures.

These projections involve making estimations and assumptions based on historical data, industry trends, and the company's future plans.

a. Working capital policies: Working capital refers to the funds a company uses for day-to-day operations and managing its short-term obligations. The analyst assesses the firm's working capital policies, such as how it manages its current assets and liabilities, to project future cash flows and liquidity.

b. Cash reserves: Cash reserves refer to the amount of cash and cash equivalents a company holds to meet its immediate financial obligations or take advantage of investment opportunities. The analyst considers the firm's cash position, cash flow projections, and cash management strategies to project future cash reserves.

c. Capital expenditures: Capital expenditures (CapEx) represent the funds invested by a company in long-term assets, such as property, plant, and equipment. The analyst evaluates the firm's CapEx plans, growth strategies, and investment decisions to project future capital expenditures.

When projecting statements, the analyst considers multiple factors, including working capital policies, cash reserves, and capital expenditures. These judgments are essential for estimating future financial performance and evaluating the firm's financial health and investment potential. By analyzing these aspects, the analyst provides insights into the firm's financial outlook and helps stakeholders make informed decisions.

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Work Shown:

PE = potential energy

KE = kinetic energy

m = mass

g = acceleration of gravity

h = height of the object

PE = m*g*h = 40,000 joules

---------

If the car is halfway down the hill, then that means the height of the car is h/2 instead of h

We can then say:

m*g*(h/2) = (m*g*h)/2 = (40,000)/2 = 20,000 J

is the amount of potential energy at this location. The amount of kinetic energy must be the remaining amount that adds to this, to get 40,000 J again.

Put another way: The 40,000 J of PE to start off with, when KE = 0, means we have a total energy of 40,000 J

---------

So,

PE+KE = total energy

PE+KE = 40,000 J

20,000 J + KE = 40,000 J

KE = (40,000 J) - (20,000 J)

KE = 20,000 J when the car is halfway down the hill.

Answer:

Sustainable energy is essential to meet uncontrolled rising demand for energy, reduce pollution and shift to resources that can be used again and again.

Explanation:

Considering the Sustainable Goals floated by United Nation, it is essential for all countries to improve their score in all the SD goals.

One of the SD goal is to shift to sustainable energy.

Sustainable energy is essential from following three points

- Reuse of energy source again and again to outcome the fear of resource depletion

- Sustainable energy source shall ensure cleaner environment

- Sustainable energy sources are also essential to meet the rising consumption of energy with time all across the globe.

Some common examples are - Solar energy, Wind Energy, Energy from nuclear fuels etc.

One way that Ms. Morimoto’s perspective is the same as President Truman’s is the belief that working peace is something we all do.

This is referred to as the officer in whom the chief executive power of a nation is vested and in most climes he/she is voted in after a election and the tenure could be four years etc.

The way in which Ms. Morimoto’s perspective is the same as President Truman’s is the belief that working peace is something we all do. This helps to prevent different types of conflict and in severe cases war which is therefore why it should be embraced.

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Answer:

2 lol

Explanation:

Explanation:

can u pls ask the question again? No full information! I mean are you required the time it takes or what ?

Energy from the battery is changed into electrical energy, which is then used to power the fan and create kinetic energy as the blades spin.

In an electric circuit, energy is changed from one form to another. When a battery is connected to a fan, energy from the battery is changed into electrical energy. This electrical energy is then used to power the fan and create kinetic energy, or energy of motion, as the blades spin.

The energy from the battery is stored in the form of chemical energy. This chemical energy is then changed into electrical energy, which is the energy required to power the fan. This electrical energy passes through the fan, causing the blades to spin. As the blades spin, kinetic energy is generated in the form of the movement of the blades.

The energy in the electric circuit is constantly changing from one form to another. The battery converts chemical energy into electrical energy, and the fan converts electrical energy into kinetic energy. This is the process of energy transformation, which allows us to convert energy from one form to another in order to use it to power appliances.

The electric circuit created by the students is a simple way to illustrate this process of energy transformation. The battery provides the initial source of energy, which is then converted into electrical energy. This electrical energy is then used to power the fan and create kinetic energy. This kinetic energy is then used to move the fan

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Answer:

Energy from the battery is changed into electrical energy, which is then used to power the fan and create kinetic energy as the blades spin.

Connection of an electric circuit

Explanation:

The linear speed of the cd is 353.8 m/s. The result is obtained by using the equation of angular speed in relation to linear speed.

An angular speed is a speed of an object in rotational motion. The angular speed in relation to linear speed is

ω = vr

Where

A cd is in a rotational motion. It has angular and linear speed.

Find the linear speed!

The radius of the cd is

r = ½d

r = ½(130) mm

r = 65 mm

r = 0.065 m

We change the unit of angular speed to rad/s.

ω = 220 rpm

ω = 220 × 2π/60 rad/s

ω = 7.33π rad/s

The linear speed will be

ω = vr

7.33π = v(0.065)

v = 23/0.065

v = 353.8 m/s

Hence, the cd has the linear speed of 353.8 m/s.

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Answer:

False

Explanation:

velocity is more important than speed

Velocity is defined as the speed with direction.

This statement is true.

Velocity is different from speed look below at the differences.

Speed is defined as the ratio between distance over time while velocity is given as the ratio of displacement i.e. speed with direction over time.

Example: Velocity is the rate of motion, speed, or action. An example of velocity is a car driving at 75 miles per hour in the north direction.

Thus, the given statement is true.

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This statement is true. Recordable optical discs, also known as write-once discs, can only be written to once, after which the data becomes permanent and cannot be erased or overwritten. The process of writing data onto these discs involves using a laser to burn tiny pits into the surface of the disc, which represent the data that is being stored. Once these pits are burned, they cannot be reversed or erased, as the disc does not have the capability to rewrite or re-burn data.

This is in contrast to rewritable optical discs, which can be erased and rewritten multiple times. These discs use a different type of material that can be heated and cooled to alter the reflective properties of the disc surface, allowing data to be written and erased multiple times.

In summary, recordable optical discs are useful for situations where permanent storage of data is required, while rewritable optical discs are more appropriate for situations where data needs to be updated or changed frequently.

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Answer:

120N

Explanation:

The question gives us Mg = 200 N and in this equation Mg is equal to the normal force. Kinetic friction is calculated by normal force * coefficient of kinetic friction. Therefore kinetic friction = 200N * 0.6 = 120N

The information given on the X-axis of the graph attached is the years from 1920-2005 (option B).

A graph in mathematics or statistics is a data chart (graphical representation of data) intended to illustrate the relationship between a set (or sets) of numbers (quantities, measurements or indicative numbers) and a reference set.

A graph consists of two axes namely; X-axis and Y-axis. The x-axis on a graph is usually drawn left to right and usually shows the range of values of an independent variable.

On the other hand, the Y-axis is the axis on a graph that is usually drawn from bottom to top and usually shows the range of values of variable dependent on one other variable.

Therefore, according to the graph illustrated above, the x-axis shows the years from 1920-2005.

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Answer: sum of the electric field energy density and magnetic field energy density.

Explanation:

The total energy stored in an electromagnetic wave is equal to the sum of energy stored in the electric and magnetic fields. In that case, the energy stored per unit volume, or energy density of the electromagnetic wave, is the sum of the electric field energy density and magnetic field energy density.

Identification of compounds can benefit from density. It is also a useful feature since it connects (or acts as a conversion factor between) a substance's mass and volume. Volume and mass are extended (or extrinsic) qualities of matter that are quantity dependent.

The force of an air mass acting on the earth's surface is known as atmospheric pressure. Remember that wind currents are created when the densities of two separate air masses differ.

Our wind currents are driven by the atmospheric pressure density, and denser air exerts a higher pressure than less dense air. Compared to the cold and dry air, the warm and humid air is less dense. The less dense air will then float on top of the thicker air in certain regions.

Therefore, Warm air masses rise while cold air masses descend because they are less dense.

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The star's surface temperature is approximately 6100 K.

Peak electromagnetic wavelength of 475.00 nm, we can make use of Wien's displacement law which relates the peak wavelength of a black body to its temperature as follows;

λmaxT = 2.898 × 10^-3

where λmax is the peak wavelength and T is the surface temperature of the black body.

Therefore, to find the surface temperature of the star we can substitute the values into the equation as follows;

λmaxT = 2.898 × 10^-3T

= 2.898 × 10^-3 / λmax

= 2.898 × 10^-3 / 475.00 x 10^-9

= 6100 K.

Therefore, the star's surface temperature is approximately 6100 K.

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Answer:

Yes it is possible to have acceleration opposing direction of velocity

Explanation:

1) when you brake the car , the velocity will decrease making the the acceleration to decrease ,it is called decelerating

2) if you imagine the effect of a resistive force or a frictional force than the acceleration is in opposite direction is possible.

The rate of heat that must be supplied to the engine for it to produce 5 hp of power is 7635 btu/h.

The formula for the efficiency of a completely reversible heat engine:

Efficiency = 1 - (Tc/Th)

where Tc is the temperature of the cold sink and Th is the temperature of the hot source. Since the engine is completely reversible, it operates at the maximum possible efficiency, which means:

Efficiency = 1 - (Temperature_sink / Temperature_source)
Efficiency = 1 - (500/1500) = 2/3

We also know that power (P) is related to the rate of heat transfer (Q) by the formula:

P = Q x efficiency

We can rearrange this formula to solve for Q:

Q = P / efficiency

Plugging in the given values, we get:

Q = (5 hp x 2545 btu/hp) / (2/3) = 7635 btu/h

Therefore, the heat must be supplied to the engine at a rate of approximately 19080.69 BTU/h for it to produce 5 hp of power.

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Answer:

Earth's magnetic field aligns the magnet in the compass with its north pole. A second method is to observe the night sky in the polar regions. Northern and Southern Lights are produced by the interaction of the Earth's magnetic field with solar radiation.

Hope this helps!!!

Answer:

The Answer is gonna be B. The normal force (magnitude and direction)

Answer:

solution given ;

mass[m]=55kg

acceleration due to gravity [g]=10m/s²

weight[W]=mg=55×10=550 Newton

First you get the data:

Time conversion: hours to seconds:

\(\bf{2\not{h}*\left(\dfrac{3600 \ seg}{1\not{h}}\right)=7200 \ seg }\)

We calculate the distance, using the formula:

                           \(\bf{d=t*v }\)

                           \(\bf{d=3600\not{seg}*3\frac{m}{\not{m}} }\)

                           \(\bf{d=21600 \ m}\)

Answer: I travel to 21600 meters.