Do you think it is harder for architects (people who design buildings) to protect structures against internal or external forces? Why?​

Explanation:

Suppose you want to shine a flashlight beam down a long, straight hallway. Just point the beam straight down the hallway -- light travels in straight lines, so it is no problem. What if the hallway has a bend in it? You could place a mirror at the bend to reflect the light beam around the corner. What if the hallway is very winding with multiple bends? You might line the walls with mirrors and angle the beam so that it bounces from side-to-side all along the hallway. This is exactly what happens in an optical fiber.

The light in a fiber-optic cable travels through the core (hallway) by constantly bouncing from the cladding (mirror-lined walls), a principle called total internal reflection. Because the cladding does not absorb any light from the core, the light wave can travel great distances.

However, some of the light signal degrades within the fiber, mostly due to impurities in the glass. The extent that the signal degrades depends on the purity of the glass and the wavelength of the transmitted light (for example, 850 nm = 60 to 75 percent/km; 1,300 nm = 50 to 60 percent/km; 1,550 nm is greater than 50 percent/km). Some premium optical fibers show much less signal degradation -- less than 10 percent/km at 1,550 nm.

1

a) The mirror's radius of curvature will be 2.7 cm

B)  The magnification of the image will be 4.0.

When a hollow spherical is divided into pieces and the exterior surface of each cut portion is painted, it forms a mirror, with the inner surface reflecting the light.

From the mirror equation;

\(\frac{1}{p}+\frac{1}{q} =\frac{1}{f} \\\\ \frac{1}{1}+\frac{1}{-10} =\frac{1}{f} \\\\ \frac{1}{f} = 1-\frac{1}{10} \\\\ \frac{1}{f} = \frac{9}{10} \\\\ f= 1.1111\)

Hence,

The radius of curvature is twice of the focal length;

\(\rm R = 2f \\\\ \rm R = 2\times 1.111 \\\\ R=2.2222 \ cm\)

Hence, the mirror's radius of curvature will be 2.7 cm.

The magnification factor is found as;

\(\rm m = \frac{-q}{p} \\\\ m = \frac{-(-10)}{1} \\\\ m = 10\)

Hence, the magnification of the image will be 4.0.

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Answer:

Explanation:

potential energy = mgh

kinetic energy = 1/2mv²

If you know the total current and  voltage across the circuit, then you can find the total resistance using the Ohm's Law, that is : R = V / I.

In a series-parallel circuit, one can find the total resistance of circuit by calculating resistance of each parallel section and then adding reciprocals of these values to obtain total resistance of parallel section. Next, you can add series resistances to this total resistance to obtain single resistance for entire circuit.

In series the total resistance is equal to the sum of the resistors. In parallel,  inverse of the total resistance is equal to the the sum of the inverse of each individual resistor.

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Note: The question given on the portal is incomplete. Here is the complete question.

Question: How is resistance calculated in a series-parallel circuit?

If a box of mass m is pushed at an angle θ by a force Fp along a frictionless surface, the magnitude of the horizontal acceleration is |a| = |(Fp * cos(θ)) / m|

Newton's second law states that the acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass. Mathematically, it can be represented as:

a = F_net / m

In this case, the net force acting on the box is the horizontal component of the applied force Fp, which can be calculated as:

F_net = Fp * cos(θ)

Substituting this into the equation for acceleration:

a = (Fp * cos(θ)) / m

Therefore, the magnitude of the horizontal acceleration is given by:

|a| = |(Fp * cos(θ)) / m|

Note that the absolute value (|a|) is used to denote the magnitude of the acceleration, which is always positive.

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The downtown is 5 miles far away, if the car travels at 10 miles / hour for 0.5 hours.

v = d / t

v = Velocity

d = Distance

t = Time

v = 10 mi / hr

t = 0.5 hr

d = v * t

d = 10 * 0.5

d = 5 mi

Velocity of the car is the rate of change of position of the car. In simple words it can be said as velocity is used to calculate the distance covered in a given amount of time.

Therefore, the downtown is 5 miles far.

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Answer:

Please find the attached pdf

Explanation:

Answer:

0.4 M

Explanation:

Just did mastering bio :)

Answer:

The laws of thermodynamics define a group of physical quantities, such as temperature, energy, and entropy, that characterize thermodynamic systems in thermodynamic equilibrium.

Answer:

Option (a) is correct

Explanation:

The acceleration of an object is defined as the rate of change of velocity. Mathematically, it can be written as :

\(a=\dfrac{v-u}{t}\)

Where

v and u are final and initial velocity

It is clear that if there is some change in velocity, it means the object is experiencing either acceleration or deceleration. Hence, the correct option is (a).

Answer:

a

Explanation:

Answer:

The projectile's horizontal speed is constant throughout the entire trajectory because gravity only acts downwards in the vertical direction.

Explanation:

I did this in Physics a while ago but I believe my answer is correct.

Hope this helps! (:

To find the tension that will give a speed of 177 m/s on a string, we can use the equation for wave speed on a string:

v = √(T/μ)

Where v is the wave speed, T is the tension in Newtons, and μ is the linear mass density of the string in kg/m.

We are given that the wave speed on the string is 154 m/s when the tension is 84.0 N. We can use this information to find the linear mass density of the string:

v = √(T/μ)
154 = √(84/μ)
(154^2) = (84/μ)
μ = 84/(154^2) = 0.000376 kg/m

Now we can use this value of μ along with the desired wave speed of 177 m/s to solve for the tension:

v = √(T/μ)
177 = √(T/0.000376)
(177^2) = T/0.000376
T = (177^2)*0.000376 = 11,860 N

Therefore, a tension of 11,860 N will give a wave speed of 177 m/s on the string.

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ANSWER- I GUESS IT SHOULD BE GRAVITATIONAL FORCE.......

Answer:

GRAVITATIONAL FORCE

Light is radiant energy in the form of a wave of electromagnetic energy.

Light is a form of electromagnetic radiation that is visible to the human eye. It is made up of a stream of energy particles, called photons, that travel in a wave-like pattern. It has various properties, including intensity, color, and direction, which can be used to explain its behavior. It can be described as having both a particle-like nature and a wave-like nature. The particle-like nature of light is exhibited in the way it travels in packets of energy, known as photons. The wave-like nature of light is demonstrated by the way it can be bent, diffracted, and refracted.
The intensity of light is determined by the amount of energy that a photon has. The color of light is determined by the wavelength of the light, with different colors having different wavelengths. Direction is also an important property of light, as it determines how light will be bent when it passes through an obstacle or is reflected off of a surface.
Light plays a critical role in the lives of humans and other organisms. It is used in vision, to help organisms understand the world around them. Light also has numerous applications in science and technology, such as in communications, photography, and solar energy.
In conclusion, light is a form of electromagnetic radiation composed of photons that travel in a wave-like pattern. It has various properties, including intensity, color, and direction, that are used to explain its behavior. Light is important for vision and has various uses in science and technology.

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The closest answer choice is (e) 190.1 kcals, but this is significantly higher than the calculated value.

The mechanical work output can be calculated as the product of force, distance, and the number of revolutions of the flywheel:

Work output = force * distance * number of revolutions

The force applied to the pedals can be calculated from the resistance:

force = resistance / pedal arm length

where the pedal arm length is the distance from the center of the pedal to the center of the pedal crank. Let's assume a pedal arm length of 17 cm (0.17 m) for this calculation.

force = 3.0 kp / 0.17 m

         = 17.65 N

The distance traveled with each revolution of the flywheel is given as 6 m.

The number of revolutions in 45 minutes can be calculated as:

number of revolutions = 75 revolutions/min * 45 min \

                                     = 3375 revolutions

Putting all the values together, we get:

Work output = force * distance * number of revolutions

Work output = 17.65 N * 6 m * 3375 revolutions

Work output = 357525 J

Converting this to kilocalories:

Work output = 357525 J * 1 kcal / 4186 J

Work output = 85.32 kcal

Therefore, the total amount of mechanical work output in kcals is approximately 85.32 kcals.

The closest answer choice is (e) 190.1 kcals, but this is significantly higher than the calculated value.

None of the answer choices are particularly close, so it's possible that there was an error in the question or the answer choices.

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a) The work done by the interaction forces is 4 J.

b) The work done by the external forces is -4 J.

a) The work done by the interaction forces can be calculated using the conservation of energy equation: ΔK + ΔU = Wint. Plugging in the given values, we get: Wint = ΔK + ΔU = 8 J + (-4 J) = 4 J.

b) The work done by the external forces is equal in magnitude but opposite in sign to the work done by the interaction forces, by the work-energy principle. Therefore, Wext = -Wint = -4 J.

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Answer:

The gravitational force between two objects depends on two factors: their masses and the distance between them. According to the universal law of gravitation, the force of attraction between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Since the mass of the Sun is much greater than that of Mercury or Jupiter, and it is at the center of the solar system, it exerts the greatest gravitational force on the other objects in the solar system. Therefore, option B, the Sun, has the greatest gravitational force among the given options.

Answer:

the bag DOES NOT BREAK,  F = 59 N

Explanation:

For this exercise, let's use Newton's second law, let's set a reference frame with the positive direction up

           F -W = m a

the mass of the groceries is m = 5 kg, the weight is

           W = m g

indicate the acceleration a = 2 m / s², let's find the force

          F = mg + ma

          F = m (g + a)

let's calculate

          F = 5 (9.8 + 2)

          F = 59 N

          F <65 N

as the force with which it pulls the bag less than the breaking force the bag DOES NOT BREAK

The answer is number 2 stomata.

Answer:

The length of the load arm is 3 m

The length of the effort arm is 15 m

Spoons and scissors are class 1 levers

Explanation:

The data given in the force diagram of the lever (machine) are;

The length of the lever = 18 m = (Length of effort arm) + (Length of load arm)

The force applied at the effort = 100 N

The load lifted by the lever = 500 N

The mechanical advantage, MA is given as follows;

MA = Load/Effort = (Length of effort arm)/(Length of load arm)

∴ MA = 500 N/(100 N) = 5

Let 'x' represent the length of the effort arm, and let 'y', represent the length of the load arm, we have;

x + y = 18...(1) (given)

MA = 5 = x/y

∴ x = 5·y...(2)

Substituting the value of 'x' in equation (1) with x = 5·y gives;

x + y = 5·y + y = 6·y = 18

∴ y = 18/6 = 3

y = 3

The length of the load arm, y = 3 m

x = 5·y = 5 × 3 = 15

x = 15

The length of the effort arm, x = 15 m

When lifting food with a spoon, the fulcrum, which can be taken as the edge of the plate or the supporting finger, is in between bowl of the spoon and the point of application of the thumb towards the extremities of the spoon handle

Therefore a spoon is a class 1 lever

The pivot of a scissors is in between the item being cut (the load) and the holes where the finger applies an effort

Therefore, a scissors is a class 1 lever.

Answer:

indirect sunlight

Explanation:

we're receiving some sunlight, but not much, if it's winter in one place, it's summer in another

Answer:

indirest sunlight

Explanation:

if there was no sunlight we would die.

A heat engine is operating between 287 c and 32 c. if the engine extracted 400 mj of energy from fuel, 4109.6 Jews mj of energy could be used as mechanical energy

Using the temperatures, a heat engine's efficiency is determined (lowest and highest).

The ratio of the system's provided heat to the desired work is considered the system efficiency. An engine's efficiency ranges from 0 to 1.

The efficiency of the engine is 27%, or 0.27. Since the heat was turned down due to the 3000 gems, we must find productive employment. Heat input and network efficiency are connected. That is the line. Qc was rejected by two W plus heat, leading to Qh. The cost of networking is composed of Nita W and Nita Qc. The network completed is identical to Nita. Q C is split into two halves. As a result, we must divide our efficiency, which is 0.27, by 3000. The engine's work is represented by this. Let's calculate the result of 0.27 multiplied by 3000 divided by 1. 1109 and 0.6 gems are the answer. He rejected our quote, which is +110 9.6 plus three thousand. 4109.6 Jews is quite close to the heat input.

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 Moral hazard occurs when someone takes on more risk because they believe they are protected from the negative consequences of that risk. In Johnny's case, having full-coverage health care made him feel less worried about potential injuries, leading him to take up skydiving lessons.

This is an example of moral hazard. Moral hazard is the tendency for people to take more risks when they are protected against the potential consequences of those risks. In this case, Johnny's full-coverage health care has reduced his concern about getting injured, leading him to take up skydiving lessons, which is a risky activity.

                                     The availability of free healthcare has altered Johnny's behavior in a way that he may not have otherwise behaved if he had to pay for health care out of pocket.
                                            Moral hazard occurs when someone takes on more risk because they believe they are protected from the negative consequences of that risk. In Johnny's case, having full-coverage health care made him feel less worried about potential injuries, leading him to take up skydiving lessons.

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In Activity 1-1, we will make a variety of observations to determine whether like or unlike charges attract each other. We will start by observing the behavior of objects with the same charge,

such as two positively charged balloons or two negatively charged balloons. If they repel each other, we can conclude that like charges repel. Similarly,

we will observe the behavior of objects with opposite charges, such as a positively charged balloon and a negatively charged balloon. If they attract each other, we can conclude that unlike charges attract.

We will also test these observations by changing the charges of the objects, such as by rubbing a balloon on a sweater to give it a charge. Through these observations, we will be able to determine the behavior of like and unlike charges and how they interact with each other.

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Answer:

5 Hz

Explanation:

Given:

Wave velocity ( v ) = 10 m / sec

wavelength ( λ ) = 2 m

We have to calculate Frequency ( f ) :

We know:

v = λ / t [ f = 1 / t ]

v = λ f

= > f = v / λ

Putting values here we get:

= > f = 10 / 2 Hz

= > f = 5 Hz

Hence, frequency of sound is 5 Hz.

The gravitational acceleration at 6400 m is 9.74 m/s² and at 6400 km is 2.43 m/s².

We need to know about the gravitational field to solve this problem. The gravitational field is the area where affected by gravitational force. The magnitude of the gravitational field can be calculated by this equation

g = G . m / (R+r)²

where g is the gravitational field, G is gravitational constant (6.67 x 10¯¹¹ Nm²/kg²), m is the mass of the planet and r is the radius of the planet

From the question above, we know that

m = 5.94 x 10²⁴ kg

R = 6371000 m

ra = 6400 m

rb = 6400000 m

Find the gravitational acceleration at 6400 m

g = G . m / (R + r)²

g = 6.67 x 10¯¹¹ . 5.94 x 10²⁴ / (6371000 + 6400)²

g = 9.74 m/s²

Find the gravitational acceleration at 6400 km

g = G . m / (R + r)²

g = 6.67 x 10¯¹¹ . 5.94 x 10²⁴ / (6371000 + 6400000)²

g = 2.43 m/s²

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Answer:

It generates many of the mistakes

Explanation:

When we meassure the distance with foot uniform velocity there there may arise many problems people foots are different to each other When we are measuring the distance from foot that is uniform velocity we must be very careful the timing of time and foot should be similar If not than there may generate many errors

The great mathematician Pythagoras also used the measurement with foot and he was successful because of his timing due to this he find the circumference of earth

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: