You are in a tall building looking out the window. You notice an object falling at 8 m/s. How fast is the objects falling 3 seconds after you notice it

Answer:

F = 20 N

Explanation:

Given:

m = 0.12 kg

H = 2.3 m

S = 0.067 m

g = 9.8 m/s²

____________

F - ?

1)

Potential energy over grass:

Wp = m*g*H = 0.12*9.8*2.3 ≈ 2.7 J

2)

Work against the friction force of the grass:

A = F₁*S

3)

According to the law of conservation of energy:

A = Wp

F₁*S = Wp

F₁ = Wp / S = 2.7 / 0.067 ≈ 40 N

4)

Average grass resistance strength:

F = F₁ / 2 = 40 / 2 = 20 N

Answer:

392 Newtons

Explanation:

In order to find the weight, you have to multiply the mass by the gravitation constant (9.8), which gives us 40.0 * 9.8 = 392 Newtons.

Answer:

Use the drop-down menus to complete the statements.

All protists live in environments that are

✔ wet

.

All protists must

✔ reproduce

.

All protists have

✔ a nucleus

.

All protists make or consume

✔ food

Explanation:

I got it right hope its the right one

Answer:

Use the drop-down menus to complete the statements.

All protists live in environments that are  

✔ wet

.

All protists must  

✔ reproduce

.

All protists have  

✔ a nucleus

.

All protists make or consume  

✔ food

.

Explanation:

Answer:

Earthquakes are likely to occur along the San Andreas Fault.

Explanation:

When the planet Mars is, on average, about 228 million km from the Sun, the correct option is about 1.52 hours.

The time it takes light from the Sun to reach Mars when the planet Mars is, on average, about 228 million km from the Sun is about 12.7 minutes.

The given question can be solved using the formula; Time = Distance / Speed of light

Given that Distance of Mars from the Sun = is 228 million km

The speed of light = 300,000 km/sNow, let's plug in the values in the formula.

Time = Distance / Speed of light = 228 × 106 km / 300,000 km/s = 760 secondsTherefore, the time taken for light to reach Mars from the Sun is 760 seconds.1 hour is equal to 3600 seconds.

Therefore, the time taken for light to reach Mars from the Sun is about 760 / 3600 hours = 0.21 hours or about 1.52 hours.

Hence, the correct option is about 1.52 hours.

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"The silver paint on a conducting sheet forms an equipotential". The statement is correct.

An equipotential is a surface where all points on it are at the same electric potential.

In the case of a conducting sheet coated with silver paint, the paint acts as a conductor, allowing charges to flow through it easily.

When a potential difference is applied to the conducting sheet, charges will flow until the potential is the same throughout the sheet.

As a result, the silver paint forms an equipotential surface where all points on it have the same electric potential.

This means that there is no potential difference between any two points on the surface, and any charge placed on the surface will be distributed evenly across it.

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Acid rain is formed when sulfur dioxide and/or nitrogen oxide are present in the atmosphere and it may cause respiratory diseases.

Acid rain is a type of precipitation of water containing suspended particles that make it have a pH lower than 7, which is generally due to the presence of sulfur dioxide and/or nitrogen oxide.

Acid rain is highly toxic and this type of precipitation may cause respiratory diseases by prolonged exposure.

In conclusion, acid rain is formed when sulfur dioxide and/or nitrogen oxide are present in the atmosphere and it may cause respiratory diseases.

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Explanation:

a) Velocity and acceleration of a car are parallel when the car is moving along a straight line in the same direction. For example, when a car is gaining speed as it moves forward in a straight line, both velocity and acceleration are directed in the same direction.

b) Velocity and acceleration of a car are anti-parallel when the car is moving along a straight line in the opposite direction. For example, when a car slows down while moving in a straight line, its acceleration is directed opposite to the direction of its velocity, or the other way around.

Answer:

a)

There is only one case where velocity and acceleration are parallel only when they are moving in the same direction.

b)

There are 3 cases where velocity and acceleration are antiparallel.

(i) When both are moving in different direction

   It means :

(ii) When the object is slowing down, where velocity and acceleration are in the opposite direction.

(iii) In case of motion reversal.

Explanation:

William Herschel thought he had found a comet when he spotted the green disk of Uranus.

Uranus is the seventh planet located far away from the Sun. It is a gaseous planet which was discovered in 1781, mistaken by a comet but after two years it was accepted as a planet. After decades of observations and only one close visit by a spacecraft, which shows us that Uranus has unique atmosphere.

Atmosphere of Uranus is mostly made up of hydrogen and helium as well as a small amount of methane and traces of water and ammonia. The presence of methane gas gives blue colour to Uranus so we can conclude that Uranus is the planet which was thought first a comet by William Herschel.

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Answer:

\(559\).

Explanation:

Integrate \(a(t)\) with respect to time \(t\) to find an expression for velocity:

\(\begin{aligned} v(t) &= \int a(t)\, d t \\ &= \int (6\, t + 8)\, d t && (\text{power rule}) \\ &= 3\, t^{2} + 8\, t + C_{v} \end{aligned}\).

Note that since this integral is indefinite, the expression for \(v(t)\) includes a constant \(C_{v}\).

Find the value of \(C_{v}\) using the fact that \(v(0) = 2\). Specifically, substitute \(t = 0\) into the expression \(v(t) = 3\, t^{2} + 8\, t + C_{v}\) and solve for \(C_{v}\!\):

\(v(0) = 3\, (0)^{2} + 8\, (0) + C_{v} = C_{v}\).

\(v(0) = 2\).

\(C_{v} = 2\).

In other words, \(v(t) = 3\, t^{2} + 8\, t + 2\).

Similarly, integrate \(v(t)\) with respect to \(t\) to find an expression for position:

\(\begin{aligned} s(t) &= \int v(t)\, d t \\ &= \int (3\, t^{2} + 8\, t + 2)\, d t\\ &= t^{3} + 4\, t^{2} + 2\, t + C_{s} \end{aligned}\).

Similarly, find the value of constant \(C_{s}\) using the fact that \(s(0) = 6\):

\(s(0) = (0)^{3} + 4\, (0)^{2} + 2\, (0) + C_{s} = C_{s}\).

\(s(0) = 6\).

\(C_{s} = 6\).

In other words, \(s(t) = t^{3} + 4\, t^{2} + 2\, t + 6\). Substitute in \(t = 7\) and evaluate to find the position of the particle at that moment:

\(s(7) = 7^{3} + 4\, (7)^{2} + 2\, (7) + 6 = 559\).

The pοsitiοn of the particle at time t = 7 is 559 units.

Tο find the pοsitiοn at time t = 7, we need tο integrate the given acceleratiοn functiοn tο οbtain the velοcity functiοn and then integrate the velοcity functiοn tο οbtain the pοsitiοn functiοn.

Given:

Acceleratiοn functiοn: a(t) = 6t + 8

Initial pοsitiοn: s(0) = 6

Initial velοcity: v(0) = 2

First, let's integrate the acceleratiοn functiοn tο οbtain the velοcity functiοn:

v(t) = ∫(a(t)) dt

= ∫(6t + 8) dt

= 3t^2 + 8t + C

Tο find the cοnstant οf integratiοn (C), we can use the initial velοcity v(0) = 2:

2 = 3(0)² + 8(0) + C

C = 2

Sο, the velοcity functiοn becοmes:

v(t) = 3t² + 8t + 2

Next, let's integrate the velοcity functiοn tο οbtain the pοsitiοn functiοn:

s(t) = ∫(v(t)) dt

= ∫(3t² + 8t + 2) dt

= t³ + 4t² + 2t + C'

Tο find the cοnstant οf integratiοn (C'), we can use the initial pοsitiοn s(0) = 6:

6 = (0)³ + 4(0)² + 2(0) + C'

C' = 6

Sο, the pοsitiοn functiοn becοmes:

s(t) = t³ + 4t² + 2t + 6

Finally, we can find the pοsitiοn at time t = 7:

s(7) = (7)³+ 4(7)² + 2(7) + 6

= 343 + 196 + 14 + 6

= 559

Therefοre, the pοsitiοn at time t = 7 is 559 units.

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In a tensile force measurement using a strain gauge, the strain gauge is typically attached to the surface of the material experiencing the tensile force. The strain gauge is a resistive sensor that changes its electrical resistance in response to the deformation or strain of the material.

When a tensile force is applied to the material, it causes the material to deform. This deformation results in a change in the length and cross-sectional area of the material. The strain gauge, being bonded to the surface of the material, also experiences this deformation, which causes a change in its resistance.
The relationship between the change in resistance (∆R) and the tensile force (P) can be derived using the concept of strain and the gauge factor (GF) of the strain gauge. The gauge factor is a constant that represents the sensitivity of the strain gauge and is typically provided by the manufacturer.
The relationship is given by the equation:
∆R = GF * R * ε
Where:
∆R is the change in resistance of the strain gauge,
GF is the gauge factor of the strain gauge,
R is the initial resistance of the strain gauge,
ε is the strain experienced by the material.
To determine the change in resistance for a strain gauge installed on a beam being pulled axially by a 50 kN tensile force, additional information is required. Specifically, the length of the beam and the modulus of elasticity (E) of the material. With this information, the strain (ε) can be calculated using the equation
ε = δL / L
Where:
δL is the change in length of the beam,
L is the initial length of the beam.
Once the strain is determined, the change in resistance can be calculated using the derived relationship ∆R = GF * R * ε, where GF and R are given as 2 and 1200, respectively.

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To define the system so that the energy changes are all transformations internal to an isolated system, we need to choose a closed system that does not exchange energy with the surroundings. The most appropriate option would be to select only the diver as the system.

This means that the energy transformations that occur during the dive, such as gravitational potential energy converting to kinetic energy as the diver falls, and kinetic energy converting to thermal energy as the diver hits the water, will all be internal to the system and not influenced by external factors such as the Earth or the water in the pool. Therefore, the answer is option (a) - Include the diver.
To define the system so that the energy changes are all transformations internal to an isolated system when a diver leaps from a high platform, speeds up as she falls, and then slows to a stop in the water, you should include the diver, Earth, and the water in the pool (option b). This way, the gravitational potential energy, kinetic energy, and the energy dissipated in the water are all accounted for within the system, ensuring all energy transformations are internal.

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Explanation:

The physics principle that goes to aerial spinning and twisting can be related to the conservation of angular momentum. ... Since momentum cannot be changed mid-air, he must decrease his rotational mass in order to increase his angular velocity. To increase his angular velocity the snowboarder tucks in his arms

Answer:

Because the boarders can not Change momentum in mid air

The relationship between the speed of light and the refractive index of a medium is essential in understanding the propagation of light in different materials.

The refractive index (n) of a medium is defined as the ratio of the speed of light in vacuum (c) to the speed of light in the medium (v). Mathematically, n = c/v. When light passes through a medium, it slows down due to interactions with atoms or molecules in the material, resulting in a decrease in speed compared to its velocity in a vacuum. The refractive index determines how much light is bent or refracted as it enters a different medium, impacting phenomena like refraction, reflection, and dispersion. This relationship plays a crucial role in various applications, such as optics, telecommunications, and the study of wave behavior in different media.

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--The complete Question is, What is the relationship between the speed of light and the refractive index of a medium, and how does it affect the propagation of light in different materials?--

Answer:

mountains, earthquakes, tsunamis

Explanation:

During this time, the typical acceleration is 2 m/s2 (option C).

The speed with which something flows in a specific direction is known as its velocity. As an illustration, think of the pace of a car driving north on something like a highway or the velocity at which a firework blasts off.

A motion or activity has velocity when it moves quickly. Another word for speed is celerity, which is also a synonym. The measurement of an object's rate and direction of positional change is known as its velocity in physics. The speed and direction of a body's motion are both specified by this vector quantity.

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Answer:

0.75kg into gram = 0.75 * 1000 = 750g

potential energy = mgh

potential energy = 750 * 10 * 0.35

potential energy = 2625 joules

KE = 1/2mv²

v² = 2KE/m

v² = 2 x 4.3 x 10⁵ : 1500

v = 24 m/s

Electricity is defined as the flow of electrical current through a conductor.

A fundamental type of energy that is produced by the presence and movement of electric charge is electricity. The passage of electrons or other charged particles across a conductor, like a wire, is what defines the phenomena. It includes the creation, transmission, and use of electric energy, as well as the full field of electric phenomena.

Therefore,

Electricity is defined as the flow of electrical current through a conductor.

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Answer:

4

Explanation:

Slowing down is ONE accel  ( a negative acceleration)

Speeding up is a positive acceleration

Going around a curve is another acceleration

slowing down again is the fourth acceleration

Answer:

the answer is b.

plsss pa brainliest po ako

Answer:

a. Light bulb - electrical to light

b. Firework - chemical to light / thermal / sound

c. Flute - kinetic to sound

d. Leaf-  solar to chemical

The correct answer is option C. Chemical.

A chemical reaction is a process in which chemical bonds between atoms are broken and reformed, resulting in the creation of new substances with different properties from the original ones. During a chemical reaction, the atoms of the reactant molecules rearrange themselves to form new products, which can have different physical and chemical properties than the original substances.

Chemical reactions can be classified into different types based on the nature of the reactants and the products formed. For instance, a synthesis reaction is a type of chemical reaction in which two or more substances combine to form a more complex compound, while a decomposition reaction is a reaction in which a compound is broken down into simpler substances.

Chemical reactions are fundamental to many natural and industrial processes, from the production of fuels and materials to the metabolism of living organisms. Understanding the mechanisms and properties of chemical reactions is crucial for many fields of science, including chemistry, biochemistry, and materials science.

In conclusion, a chemical reaction is a process in which substances change to other substances as chemical bonds break and reform. It is a fundamental concept in chemistry and has important applications in many scientific and industrial fields.

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Answer:

option d is answer because pd is measured in volt.

Answer:

Aim: To investigate which material of pot will cook food quicker.

Hypothesis: The (aluminum/enamel) pots will cook the food quicker than the (aluminum/enamel) pots.

Apparatus:

- Aluminum pots

- Enamel pots

- Stove top

Variables:

Independent variable (What will be changed) - Material of pot

Dependent variable (What's being measured) - Time taken for food to cook

Controlled variables (What's staying the same) - Size of pot, type of food being cooked, quantity of food being cooked, stove top

Method:

Results: (I don't have results because i never conducted this experiment)

Conclusion: This experiment showed that (aluminum/enamel) pots cooked the food quicker than (aluminum/enamel pots). These results (supported/rejected) my hypothesis.

Evaluation: (Never did the experiment, so there's nothing to evaluate)

Explanation:

I hope this helps :)

This solution is not optimal because selecting items solely based on their value does not consider their weight, potentially leading to exceeding the weight constraint and missing out on other valuable items with lower weights.

The greedy solutions described, namely (a) greedy by value, (b) greedy by weight, and (c) greedy by value density, may not always yield optimal results. While they offer straightforward and intuitive approaches to the problem of selecting items, their optimality depends on the specific scenario and problem constraints.

(a) Greedy by value selects the item with the highest value at each step. This strategy ignores the weight of the items entirely. In certain cases, it may lead to a suboptimal solution where the selected items have a high value but exceed the weight capacity, resulting in an infeasible solution.

(b) Greedy by weight prioritizes selecting the item with the least weight at each step. This approach may result in a feasible solution, but it disregards the value of the items. Consequently, it may lead to a suboptimal solution where the selected items have a low value compared to other available items.

(c) Greedy by value density aims to find a balance between value and weight by selecting items with the largest value per unit weight ratio. This approach seems more promising as it considers both factors. However, even this strategy can fall short in certain scenarios, where the optimal solution may require a different combination of items.

In conclusion, while the described greedy solutions provide simple heuristics, they are not guaranteed to be optimal in all cases. The optimality of these strategies depends on the specific problem and its constraints. To determine the best solution, it is necessary to consider alternative algorithms and optimization techniques.

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Answer:

the third one is incorrect

Explanation:

10 x 10³= 10^1 x 10^3 = 10^4

Design of a Plywood Membrane Absorber with Resonance Frequencies from 45 to 65 Hz

In this design, we will create a panel absorber using plywood that meets the following criteria: resonance frequencies ranging from 45 to 65 Hz and a maximum extension of 10 inches from its packing surface.

The absorber will effectively dampen sound waves within this frequency range, providing efficient acoustic treatment.

Determine the dimensions: Let's assume a square-shaped plywood panel with a side length of 24 inches.

Calculate the thickness: To achieve the desired resonance frequencies, we can use the formula for the fundamental resonance frequency of a panel absorber:

f = 2000 * (sqrt(t / (L^2 * ρ))),

where f is the frequency in Hz, t is the thickness of the panel in inches, L is the side length in inches, and ρ is the density of the material in lbs/in^3.

Let's set the resonance frequency to 45 Hz:

45 = 2000 * (sqrt(t / (24^2 * ρ)))

Solving for t, we find:

t = (45^2 * 24^2 * ρ) / 2000^2

For a resonance frequency of 65 Hz, the equation would be the same, but with 65 instead of 45.

Material selection: Choose a plywood thickness that satisfies the above equations for both resonance frequencies. Additionally, ensure the plywood does not extend more than 10 inches from its packing surface.

By following the design specifications outlined above, we can create a plywood membrane absorber that meets the required criteria of resonance frequencies ranging from 45 to 65 Hz and a maximum extension of 10 inches from its packing surface.

This design will effectively dampen sound waves within the specified frequency range, providing efficient acoustic treatment.

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Answer:

False

Explanation:

The wavelength of red light is greater than blue light.  Its energy is less.

Both statements are false.    Search for a graphic of the "electromagnetic spectrum."  Many will note the wavelengths of the various regions (IR, UV, Visible, Microwave, etc.  Observe the relationships.  Red has less energy than blue.  That sounds counterintuitive, based on artist's use of red to connote fire or some energetic situation.  But the red in a fire obscures human vision to the blues and UV radiation from the same source.  A welder uses a UV shield to blocjk these wavelengths, to avoid eye damage.