Scientists in a test lab are testing the hardness of a surface before constructing a building. Calculations indicate that the entire structure would sink by a certain amount for every additional floor that is added. If the maximum permissible limit for depression of the structure is 20 centimeters, how many floors can be safely added to the building?

A.14
B.15
C.18
D.23

Atmospheric density at sea level is 1.225 kg/m3. Density of air decreases with height/altitude. According to International Standard Atmosphere (ISA), for an altitude of 40,000 feet, the density of air is 0.003996 kg/m3. So the aircraft operating at 40,000 feet msl will encounter an atmospheric density of 0.003996 kg/m3 (0.000249 lb/cu.ft.)

As per the question the initial speed of the car [ u] is 42 m/s.

The car applied its brake and comes to rest after 5.5 second.

The final velocity [v] of the car will be zero.

From the equation of kinematics we know that

                                         [tex]v=u+at[/tex] [ here a stands for acceleration]

                                         [tex]0=42 +5.5a[/tex]

                                         [tex]a =\frac{-42}{5.5} m/s^2[/tex]

                                          [tex]a= -7.64 m/s^2[/tex]

Here a is taken negative as it the car is decelerating uniformly.

We are asked to calculate the stopping distance .

From equation of kinematics we know that

                                              [tex]S=ut+\frac{1}{2} at^2[/tex]  [here S is the distance]

                                                      [tex]= 42*5.5 +\frac{1}{2} [-7.64] [5.5]^2 m[/tex]

                                                       [tex]=115.445 m[/tex]      [ans]  

The racing car, decelerating at a uniform -7.64 m/s², travels 115.5 meters during the braking process over 5.5 seconds.

To find the distance a car travels during braking from a certain speed, you can use a physics formula for motion which states that displacement (distance) = Initial velocity * time + 0.5 * acceleration * time squared. As the car is slowing down, the acceleration will be negative. Hence, we have:

Initial speed u = 42 m/s

Final speed v = 0 m/s (as the car comes to rest)

Time t = 5.5 s

Using the first equation of motion to find acceleration a, v = u + at, thus, a = (v-u)/t = (0 - 42)/5.5 resulted in a = -7.64 m/s².

Now, by using the formula of motion s = ut + 0.5at², the distance can be calculated as follows: s = (42m/s * 5.5s) + 0.5 * -7.64 m/s² * (5.5s)², which results to s = 115.5m. Therefore, the car travels a distance of 115.5 meters while braking.

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During convection, Warm fluid rises & cool fluid sinks (C).

Answer is C- warm fluid rises and cool fluid sinks.

Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. Convection process takes place through advection or diffusion.

The results of the controlled experiment refute the claims of the company.

Answer:

The results of the controlled experiment refute the claims of the company.

Explanation:

Did the study island!

Answer:

The mechanical energy isn't conserved. Some energy is lost to friction.

Explanation:

The energy of the system isn´t conserved because the whole system has other forces involved on it, in the ideal case with no friction or resistance the mechanical energy should be conerved and should always add up to the initial potential energy of the system, since this is not the case of a closed sytem and there is friction we could say that mechanical energy is lost to frictio and it isnñt conserved.

The answer:

the field lines of the magnetosphere farther apart on the side of Earth facing away from the sun Because of the solar wind (the corona) which is released from the upper atmosphere of the Sun. it is a stream of charged particles.This plasma consists of alpha particles electrons, and protons. And has a kinetic energy between 0.5 and 10 keV. This solar wind which is ionized is distorting the Earth's field so this affected the field lines of the magnetosphere farther apart on the side of Earth facing away from the sun.

The correct stage of role taking according to symbolic interactionism is the play stage.

Symbolic interactionism is a sociological perspective that is influenced by the work of George Herbert Mead. According to Mead, the process of role taking involves several stages through which individuals develop their self-concept and learn to interact with others in society. The stages are as follows:

1. Preparatory Stage (Imitation): In this initial stage, children imitate the behaviors and actions of significant others without fully understanding the roles they are imitating.

2. Play Stage: This is the stage where individuals, often children, begin to imagine and play the role of a significant other. During the play stage, children take on the roles of people in their lives, such as parents, teachers, or other figures, and act out scenarios from their perspective. This imaginative play helps children to understand the roles and expectations of different social positions.

3. Game Stage: In the game stage, individuals start to internalize the generalized other, which represents the organized attitudes of a social group. Here, children learn to consider the expectations of a wider community and how their actions fit into larger social systems. They learn to play games with rules and understand that each role has its own set of expectations and behaviors that are dictated by social norms.

4. Generalized Other: Finally, individuals develop the ability to think from the perspective of the generalized other, which means they can consider the expectations of society as a whole when interacting with others. This stage is crucial for the development of a fully formed self-concept and the ability to engage in complex social interactions.

Thus, the play stage is where individuals begin to imagine and play the role of a significant other, which is essential for the development of empathy, social understanding, and the ability to take on various social roles throughout life.

Given:

u(initial velocity): 154 m/s

accelerates (a): 1.8 m/s^2

t= 1 min=60 secs

Now we know that

s= ut  + 1/2(at^2)

s= 154 x 60 + (1.8 × 60 ×60) ÷ 2

s= 12,480 m

Around 48 % of the incoming solar energy passes through the atmospheric layer of the earth. The water vapor,ozone and dust present in the atmosphere absorbs 23 percent of incoming solar energy .Thus about 71% of the incoming solar radiation is absorbed by the earth. The rest 29% of the incoming solar radiation is reflected back into the space.

Scientific theories are constantly changing for many reasons. Sometimes it IS because of new evidence. But we would not use the term proven because they ARE always changing! Therefore, the answer is B.

i believe your looking for this word ?? "fundamental".

Answer:

Fundamental frequency

Explanation:

Fundamental frequency is the lowest frequency which produced due to the oscillation of the body. This frequency is different from other higher frequencies.  If the tube is closed at one end, the velocity of sound divided by 4 times the length of the tube gives the fundamental frequency. The higher frequencies can be obtained by integral multiple of the fundamental frequency.

D:Some heat from the iron will move to the water causing both to change temperatures.

Answer: D 1.7 m/s

In order to find the velocity of the person on the walk way with respect to the person on the ground we have to apply relative velocity concept.

Consider the observer on the ground as B and the person walking on the pathway as A.The relative velocity is the velocity that the body A would appear to an observer on the body B and vice versa.

Mathematically speaking the relative velocity is the vector difference between the velocities of two bodies.

Relative velocity = Velocity of Body A- Velocity of Body B.

Velocity of the person walking on the walkway (A)= 1.5 m/s.(given)

Velocity of the observer on the ground (B)= -0.2 m/s(given).

Relative velocity of object A with respect to B = 1.5 - (-0.2)= 1.7 m/s.

Thus the velocity of the person on the walk way with respect to the observers on the ground is 1.7 m/s.

Let the Fugitive catch the empty box after "t" s of time

So the distance moved by train in same time will be

[tex]d = 5.5*t[/tex]

Now in the same way distance moved by fugitive who is accelerating with a = 4.2 m/s^2 to his maximum speed v = 8 m/s

SO the time taken by him to reach maximum speed

[tex]vf = vi + at[/tex]

[tex]8 = 0 + 4.2*t[/tex]

[tex]t = 1.9 s[/tex]

distance moved by fugitive in t = 1.9 s

[tex]d = vi* t + \frac{1}{2}at^2[/tex]

[tex]d = 0 + \frac{1}{2}*4.2* 1.9^2[/tex]

[tex]d = 7.62 m[/tex]

So in 1.9 s the train will move more than 7.62 m so it will definitely catch the train after this

distance moved by fugitive in time "t" = distance moved by train in same time

Let say it will catch the train after t = 1.9 s so after that time it will move to his constant speed of 8 m/s

[tex]7.62 + 8 * (t - 1.9) = 5.5 * t[/tex]

[tex]8*t - 5.5*t = 8*1.9 - 7.62[/tex]

[tex]2.5*t = 7.58[/tex]

[tex]t = 3.03 s[/tex]

So it will take 3.03 s to catch the train

Part B)

Distance traveled by fugitive in same time

[tex]d = 7.62 + 8*(t - 1.9)[/tex]

here it is because the fugitive will accelerate to reach at his maximum speed of 8 m/s till 1.9 s and cover a total distance of 7.62 m and after that it will move at his maximum speed for rest of the time.

[tex]d = 7.62 + 8*(3.03 - 1.9)[/tex]

[tex]d = 16.67 m[/tex]

so it will move a distance of 16.67 m

Answer:

Option B, 11 m is the correct answer.

Explanation:

We have equation of motion ,[tex]s=ut+\frac{1}{2} at^2[/tex] , s is the displacement, u is the initial velocity, a is the acceleration and t is the time.

In this case u = 0 m/s , t = 1.5 seconds , a = acceleration due to gravity = [tex]9.8m/s^2[/tex] , we need to find displacement

Substituting

 [tex]s=0*1.5+\frac{1}{2} *9.8*1.5^2\\ \\ s=11.025m[/tex]  

So option B, 11 m is the correct answer.

Answer:

11

Explanation:

A small planet with a rocky surface and atmosphere refers to the inner terrestrial planets like Venus and Mars. Venus has a thick, corrosive atmosphere, while Mars has a thin one. Both have rocky surfaces with geological features.

The planet that is small, with a rocky surface and an atmosphere is one of the inner or terrestrial planets of our solar system, which include Mercury, Venus, Earth, and Mars. Understanding their characteristics helps us compare and contrast them. For example, Mercury is the smallest planet and has a thin atmosphere which causes extreme temperatures. Venus, on the other hand, has a thick corrosive atmosphere and high surface temperatures, with geological features such as mountains and volcanoes that indicate a rocky surface. Earth has a unique atmosphere that supports life, and Mars also has a rocky surface with a thin atmosphere.

Based on the lesson summary provided, all four inner planets are known for their solid, rocky surfaces, but their atmospheres differentiate them. While Mercury's atmosphere is very thin, Venus' is thick and corrosive, Earth's supports life, and Mars' is thin but exists nonetheless. Each planet has unique surface features like craters, mountains, and volcanoes due to their geological histories.

These details not only highlight the differences in the atmospheres and surfaces of these terrestrial planets but also emphasize the factors, such as proximity to the Sun, that determine their conditions and compositions.

The latent heat of fusion of water is important for moderating air temperatures near large bodies of water, as it releases energy that warms the air and stabilizes the temperature when water freezes.

The latent heat of fusion is highly significant when it comes to the relationship between water and its impact on air temperatures. When water freezes, it releases latent heat, which helps to moderate temperature fluctuations in the environment. For a large body of water to transition from liquid to solid state, a vast amount of energy is required to be released in the form of latent heat. This energy release into the surrounding air can prevent temperatures from falling drastically below 0°C. This is because the freezing process is endothermic and expends heat energy that warms the air, thus slowing down the heat loss from the air.

Differing from sensible heat, latent heat does not result in a temperature change in the water itself during the state change. Hence, while a large body of water is undergoing freezing, it stabilizes the ambient air temperature in its proximity, making it a key climatic factor in regions near large lakes or oceans.

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could you please specify?

B is momentum.  It's a quantity of motion, or "how much stuff is moving"

C is *almost* kinetic energy but it's missing an exponent of 2 on the velocity, v.

D is an amound of work done in moving something a distance d while applying a constant force F.

That leaves A.  This is the potential energy of an object of mass m, in a gravitational acceleration g, at a height h above the reference point (usually the ground)

Answer is A- mgh.

The equation for gravitational potential energy is mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m/s ∧2 on Earth), and h is the height above the ground in meters.

Gravitational potential energy is defined as the  energy an object possesses due to its position in a gravitational field.

Yes, the equation is balanced. There are the same number of Nitrogen (N)  and Hydrogen (H) atoms one each side of the equation.

Hope I helped

Speed of the TRAX is given as 16 m/s so let say it is given as

[tex]v_t = 16 m/s[/tex]

now our speed towards the front end is given by 5 m/s so this is the relative speed of us with respect to TRAX

let say this speed is given as

[tex]v_1t = 5 m/s[/tex]

now we need to find the speed with respect to someone standing outside the TRAX

so here we need to find the net speed in ground frame and hence we can use the formula of relative speed

[tex]v_{1t} = v_1 - v_t[/tex]

[tex]v_1 = v_{1t} + v_t[/tex]

[tex]v_1 = 5 + 16[/tex]

[tex]v_1 = 21 m/s[/tex]

so someone outside the TRAX will see our speed as 21 m/s

The average kinetic energy of a substance is directly proportional to the temperature of that substance.

[tex]Mathematically\ Kinetic\ energy [K.E]\ \alpha\ T[/tex]

Here T is the temperature.

During the process of change of state,the temperature of the system remains constant as long one substance is not converted into another substance. It means that the energy absorbed or released at that time is utilised in changing the state of substance only. As kinetic energy is constant,so gain or loss of energy is attributed to potential energy.

In the given question,the water is converted from solid to liquid. During the melting of ice, heat is given to the ice for converting into liquid. The energy given is called latent heat which is nothing else than the gain of potential energy of water.

Hence water in liquid form has more potential energy than solid ice.

At the melting point, the solid  form of water changes to liquid form. This happens at fixed temperature. During the phase change, the bonds between the molecules break and weakens. This reduces the binding potential energy.  There is no change in the translational kinetic energy which is reflected by the temperature being constant during the phase change. The binding potential energy which reduces is actually utilized in breaking of the molecular bonds which eventually causes the phase change.

Answer:

FALSE

Explanation:

When object float in water then it means that weight of the object is counterbalanced by the buoyancy force.

Here as we know that buoyancy force is the weight of water displaced by the object.

So here when object is submerged into the water then the submerged part of the volume of object will displace exactly the same volume of water and that volume of water will exert upwards buoyancy force on the object.

So here this statement is not true as it says that volume of water displaced is volume above the surface of water while it must be like volume of water displaced must be equal to volume of submerged part of the object.

Answer: false

Explanation: the volume of water displaced is not equal to the volume of the object because the object is not submerged by the water. So the water displaced is the down trust force exerted on the water by the object

If the ball, the cliff, and the ground are all on the Earth, and everything is bathed in an ocean of air, then the ball's acceleration will decrease as it falls, because of the friction of air resistance.  If it has far enough to fall, it's possible that its acceleration may even become zero, and the ball settle on a constant speed (called "terminal velocity") before it hits the ground.

But until we get to College-level Physics and Engineering, we ALWAYS ignore that stuff, and assume NO AIR RESISTANCE.  The ball is in FREE FALL, and the ONLY force acting on it is the force of gravity.   We also assume that the distance of the fall is small enough so that the value of gravity is constant over the entire fall.

Under those assumptions, there's nothing present to change the acceleration of the falling ball.  It's 9.81 m/s² when it rolls off the edge of the cliff, and it's 9.81 m/s² when it hits the ground.

The transformation of chemical energy into thermal energy is best explained by option C.

Option C. Squirrel uses the energy in seeds to build structures in its body.

The Law of conservation of energy states that if the chemical energy is converted into thermal energy during a process, then total energy will be constant during the process.

In the given options, Option C will be best suited for the energy conservation law.

When the squirrel ate the seeds, it gets the energy. The seeds contain chemical energy which is converted into thermal energy when the squirrel eats seeds. This thermal energy helps to frame the structures inside the body.

Hence we can conclude that option C is the best explaination.

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The magnitude of electrical force between them is about 7.52 × 10⁻¹¹ Newton

[tex]\texttt{ }[/tex]

Electric charge consists of two types i.e. positively electric charge and negatively electric charge.

[tex]\texttt{ }[/tex]

There was a famous scientist who investigated about this charges. His name is Coulomb and succeeded in formulating the force of attraction or repulsion between two charges i.e. :

[tex]\large {\boxed {F = k \frac{Q_1Q_2}{R^2} } }[/tex]

F = electric force (N)

k = electric constant (N m² / C²)

q = electric charge (C)

r = distance between charges (m)

The value of k in a vacuum = 9 x 10⁹ (N m² / C²)

Let's tackle the problem now !

[tex]\texttt{ }[/tex]

Given:

charge of proton = q₁ = 1.6 × 10⁻¹⁹ C

charge of electron = q₂ = 1.6 × 10⁻¹⁹ C

distance between proton and electron = R = 1.75 nm = 1.75 × 10⁻⁹ m

Unknown:

electrical force between them = F = ?

Solution:

[tex]F = k \frac{q_1 q_2}{R^2}[/tex]

[tex]F = 9 \times 10^9 \times \frac{ 1.6 \times 10^{-19} \times 1.6 \times 10^{-19} }{ ( 1.75 \times 10^{-9} )^2 }[/tex]

[tex]F = 9 \times 10^9 \times \frac{ 2.56 \times 10^{-38} }{ 3.0625 \times 10^{-18} }[/tex]

[tex]F \approx 7.52 \times 10^{-11} \texttt { Newton}[/tex]

[tex]\texttt{ }[/tex]

[tex]\texttt{ }[/tex]

Grade: High School

Subject: Physics

Chapter: Static Electricity

[tex]\texttt{ }[/tex]

Keywords: Series , Parallel , Measurement , Absolute , Error , Combination , Resistor , Resistance , Ohm , Charge , Small , Forces

Given:

u(initial velocity)=0

a=5.54m/s^2

v(final velocity)=2 m/s

v=u +at

Where v is the final velocity.

u is the initial velocity

a is the acceleration.

t is the time

2=0+5.54t

t=2/5.54

t=0.36 sec

Using the formula for acceleration, we find that the time it would take the box to reach the speed of 2.0 m/s under an acceleration of 5.54 m/s^2 is approximately 0.36 seconds.

To find out the time t it would take the box to reach the speed of 2.0 m/s under an acceleration of 5.54 m/s2, you would use the formula for acceleration, which is acceleration = change in speed / time. Solving this formula for time gives time = change in speed / acceleration.

Plugging the given values into this formula, we get time = 2.0 m/s / 5.54 m/s2. Calculating this gives a time of approximately 0.36 seconds.

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Answer:

C is correct.

Explanation:

If they are on a sandy island there won't be any materials truly pure. Therefore, they will only find impure materials.

The most difficulty for making semiconductors that Ronald's characters have to overcome is that any substances they find are too impure. So, option B is correct.

A semiconductor is an electrical device whose conductivity range lies in between that of conductors and insulators.

Here,

From the given details above, Roland writes about some boaters who become stranded on a sandy island. In that island, they were set to collect materials to create semiconductors to repair computer components in their radio.

In an island full of sands, the raw materials available for collecting will be extremely contaminated. In order to make good semiconductors they need pure silicon and germanium which are good semiconductor materials. But in the island, the materials will be so impure that there will be a large limitation for collecting raw materials to make semiconductors. There will be no scientific technique in an island to purify the materials, which will be the most difficulty for the boaters.

Hence,

The most difficulty for making semiconductors that Ronald's characters have to overcome is that any substances they find are too impure.

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