A plane is landing at a speed of 67 m/s when it hits the runway. The plane's brakes provide an acceleration of -1.5 m/s/s for 45 seconds. What distance of runway does the plane need to stop?O2072 metersO89.7 meters1496 meters3138 metersI do not know how to solve this question

Given :

A mover slides a refrigerator weighing 650 N at a constant velocity across the floor a distance of 8.1 m.

The force of friction between the refrigerator and the floor is 230 N.

To Find :

How much work has been performed by the mover on the refrigerator.

Solution :

Since, refrigerator is moving with constant velocity.

So, force applied by the mover is also 230 N ( equal to force of friction ).

Now, work done in order to move the refrigerator is  :

\(W = Force\times distance\\\\W = 230 \times 8.1\ N\ m\\\\W = 1863\ N\ m\)

Hence, this is the required solution.

When the pressure (100 N) and weight (40 kg) are entered into the appropriate fields, the gravity is 2 m/s².

Force and acceleration are linked by the equation F=ma. The characters "F," "m," and "a" stand for acceleration, mass, and force, respectively. Force is the ability of one object to exert a pull or force on another. Acceleration is the rate at which an object's speed changes.

Speed increase is the pace of progress of speed. Acceleration typically indicates a change in speed, but not always. Because its velocity is changing in the opposite direction, even if an object moves in a circle at the same speed, it will still accelerate.

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The owner's velocity is in the opposite direction of the combined velocity of the dog and the cat, and its magnitude is approximately 0.916 m/s.

To solve the given problem, we can use the principle of conservation of momentum to find the direction and magnitude of the owner's velocity.

Let's denote the velocity of the dog as v1 (northward), the velocity of the cat as v2 (eastward), and the velocity of the owner as v (unknown).

According to the conservation of momentum, the total momentum before the interaction is equal to the total momentum after the interaction.

The total momentum before the interaction is given by:

Total momentum before = (mass of the dog * velocity of the dog) + (mass of the cat * velocity of the cat) + (mass of the owner * velocity of the owner)

Mass of the dog (m1) = 24.4 kg

Velocity of the dog (v1) = 2.14 m/s

Mass of the cat (m2) = 5.53 kg

Velocity of the cat (v2) = 3.56 m/s

Mass of the owner (m3) = 78.5 kg

Velocity of the owner (v) = unknown

Total momentum before = (24.4 kg * 2.14 m/s) + (5.53 kg * 3.56 m/s) + (78.5 kg * v)

The total momentum after the interaction is zero since the owner has the same momentum as the pets taken together.

Total momentum after = 0

Equating the two expressions:

(24.4 kg * 2.14 m/s) + (5.53 kg * 3.56 m/s) + (78.5 kg * v) = 0

Simplifying the equation:

(52.216 kg·m/s) + (19.6488 kg·m/s) + (78.5 kg * v) = 0

71.8648 kg·m/s + (78.5 kg * v) = 0

Solving for v:

78.5 kg * v = -71.8648 kg·m/s

v = -71.8648 kg·m/s / 78.5 kg

v ≈ -0.916 m/s

Therefore, the direction of the owner's velocity is opposite to the combined velocity of the dog and the cat, and the magnitude of the owner's velocity is approximately 0.916 m/s.

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Answer:

The angular width is "\(1.575\times 10^{-3} \ rad\)" and the linear width is "\(2.835\times 10^{-3} \ m\)".

Explanation:

Given:

Wavelength,

\(\lambda = 630 \ nm\)

or,

  \(=630\times 10^{-9} \ m\)

Slit width,

\(a = 0.8 \ mm\)

or,

  \(=0.8\times 10^{-3} \ m\)

Distance between slit and screen,

\(D = 1.8 \ m\)

As we know,

The central bright fringe's angular height,

⇒ \(\theta = \frac{2 \lambda}{a}\)

       \(= \frac{2\times 630\times 10^{-9}}{0.8\times 10^{-3}}\)

       \(=1.575\times 10^{-3} \ rad\)

and,

The linear width will be:

⇒ \(x_o=\frac{2D \lambda}{a}\)

By substituting the values, we get

        \(=\frac{3\times 1.8\times 630\times 10^{-9}}{0.8\times 10^{-3}}\)

        \(=2.835\times 10^{-3} \ m\)

Answer:

The wait time is \(t_w = 3.4723 \ s\)

Explanation:

From the question we are told that

    The distance of the hot air balloon above the ground is  \(z = 50 \ m\)

    The distance of the hot air  balloon from the target is  \(k = 100 \ m\)

    The  speed of the wind is  \(v = 15 \ m/s\)

Generally the time it will take the balloon to hit the ground  is  

           \(t = \sqrt{ \frac{2 * z }{g} }\)

where g is acceleration due to gravity with value \(g = 9.8 m/s^2\)

   substituting values  

                  \(t = \sqrt{ \frac{2 * 50 }{9.8} }\)

                 \(t = 3.194 \ s\)

Now at the velocity the distance it will travel before it hit the ground is mathematically represented as

               \(d = v * t\)

   substituting values

              \(d = 15 * 3.194\)

             \(d = 47.916 \ m\)

Now in order for the balloon to hit the target on the ground it will need to travel b distance on air before the balloonist drops it and this b distance can be evaluated as  

         \(b = k - d\)

   substituting values

        \(b =100 -47.916\)

         \(b = 52.084 \ m\)

Hence the time which the balloonist need to wait before dropping the balloon is mathematically evaluated as

        \(t_w = \frac{b}{v}\)

substituting values

       \(t_w = \frac{52.084}{15}\)

       \(t_w = 3.4723 \ s\)

78% of the houses in Elizabeth's town were for sale last summer.

To find the percentage of houses that were for sale last summer in Elizabeth's town, we need to divide the number of houses for sale by the total number of houses and then multiply by 100.

The total number of houses in Elizabeth's town is given as 9,000. Last summer, 7,020 houses were for sale. To calculate the percentage, we divide 7,020 by 9,000:

Percentage = (7,020 / 9,000) * 100

Simplifying the calculation:

Percentage = 0.780 * 100

Percentage = 78.0%

To explain further, we take the number of houses for sale (7,020) and divide it by the total number of houses (9,000) to get the ratio of houses for sale to the total. Multiplying this ratio by 100 gives us the percentage. In this case, 78.0% indicates that a significant portion of the houses in Elizabeth's town were available for sale during the summer.

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The diameter of the smaller end of the pipe is approximately 0.78 meters.

To determine the diameter of the smaller end of the pipe, we can use the principle of conservation of mass. According to this principle, the mass flow rate of water should remain constant throughout the pipe.

The mass flow rate is given by the equation:
Mass flow rate = density of water * cross-sectional area * velocity

Since the density of the water remains constant, we can write:
Cross-sectional area1 * velocity1 = Cross-sectional area2 * velocity2

Given that the velocity1 is 13 m/s, the diameter1 is 1.2 m, and the velocity2 is 30 m/s, we can solve for the diameter2 using the equation:
(pi * (diameter1/2)^2) * velocity1 = (pi * (diameter2/2)^2) * velocity2

Simplifying the equation:
(1.2/2)^2 * 13 = (diameter2/2)^2 * 30

Calculating the equation:
(0.6)^2 * 13 = (diameter2/2)^2 * 30

0.36 * 13 = (diameter2/2)^2 * 30

4.68 = (diameter2/2)^2 * 30

Dividing both sides by 30:
0.156 = (diameter2/2)^2

Taking the square root of both sides:
0.39 = diameter2/2

Multiplying both sides by 2:
0.78 = diameter2

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The  two differences between mains electricity and that supplied by a 1.5V cell:

Power Output means the average rate of electric energy delivery during one Metering Interval.

Power output: Compared to a 1.5V cell, mains electricity has a much greater power output. This is so that more power can be delivered to devices and appliances by mains electricity, which is provided at a higher voltage and current.

Compared to a 1.5V cell, the voltage provided by mains electricity is usually much higher. A 1.5V cell produces DC (direct current) voltage, whereas the mains electricity in the majority of nations is typically supplied at a voltage of 110–120V or 22–240V AC (alternating current). The kinds of devices and appliances that can be powered by mains electricity versus those that can be powered by a 1.5V cell are affected by this difference in voltage levels.

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Answer:

Today's stereotyping, bias, and racial profiling can intersect with religion in several ways. In many cases, individuals who are members of certain religious groups may be subject to stereotyping and prejudice based on their beliefs, dress, or appearance. This can lead to bias and discrimination in employment, housing, and other areas of life.

Racial profiling, or the use of race or ethnicity as a factor in law enforcement practices, can also intersect with religion in cases where individuals of certain religious groups are targeted for surveillance or scrutiny based on their perceived association with terrorism or other criminal activities. This can lead to a breakdown of trust between law enforcement and the affected communities, and can have negative consequences for public safety.

Personal opinions fueled by social media outlets can also affect how we understand or view religious beliefs. Social media can provide a platform for individuals to express their opinions and beliefs, but it can also perpetuate stereotypes and misinformation about certain religious groups. This can lead to polarization and divisiveness, and can contribute to a climate of fear and suspicion towards certain religious groups.

To address these issues, it's important to promote education and awareness about different religious beliefs and practices, and to work towards building inclusive and respectful communities. This can involve engaging in dialogue with individuals from different religious backgrounds, challenging stereotypes and prejudices, and advocating for policies that promote equity and justice for all.

Explanation:

brain

To answer the first question, we need to determine the location of the center of gravity of the system. Assuming the person and ladder can be treated as a uniform object, the center of gravity will be located at the midpoint of the ladder.

Let's say the ladder is 10 feet long, so the midpoint would be 5 feet from either end. If we assume the ladder is resting at a 60 degree angle against a vertical wall, we can use trigonometry to determine the horizontal distance of the center of gravity from the point where the ladder touches the ground.
Using the sine function, we know that sin(60) = opposite/hypotenuse, so the opposite side (which is the vertical height of the ladder) is 10*sin(60) = 8.66 feet. Therefore, the horizontal distance from the center of gravity to the point where the ladder touches the ground is also 8.66 feet.
To answer the second question :

We need to calculate the torque about the axis of rotation (point B) by taking the total weight of the person + ladder acting at the center of gravity. The formula for torque is torque = force x distance.
The force is equal to the weight of the person + ladder, which we'll assume is 300 pounds. The distance is the horizontal distance we just calculated, which is 8.66 feet.

So the torque about point B would be 300 pounds x 8.66 feet = 2,598 Newton-meters (Nm) or 2,598 pound-feet (lb-ft).

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The magnitude of the net force on the rotor due to the unbalanced samples is 64.4 N.

The total amount of forces exerted on an object is referred to as the magnitude of force. The strength of the force increases when all the forces are pulling in the same direction. When forces are exerted on an item from different angles, the force's strength reduces.

If the net force acting on an object is zero, then the object is not accelerating and is in a state that we refer to as equilibrium. The magnitude of the net force acting on an object is equal to the mass of the object multiplied by the acceleration of the object.

radius r = 12 cm = 12 x 10-2 m

Mass : 10 mg = 10 x 10 -6 kg

angular speed ω = 70,000 rpm = 7330.4 rad/sec

The net force is given by :

F = m ω 2r

Substitute the given values in equation

F = (10 * 10\((10 * 10^{-6} kg ) * (7330.4rad / s )^{2} * (12 * 10^{-2} m)\)

F = 64.4 N

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Topic: The Effect of Temperature on Enzyme Activity in Plants
Hypothesis: I predict that as the temperature increases, the rate of enzyme activity in plants will also increase. As the temperature decreases, the rate of enzyme activity in plants will decrease.

Temperature is the measure of the average kinetic energy of the particles in a substance. It is measured in degrees Celsius (°C), Fahrenheit (°F), or Kelvin (K). Temperature is determined by the amount of heat present in a substance, which is a measure of the average kinetic energy of its particles. Heat is the energy transferred from a hotter object to a cooler one. When two objects of different temperatures come into contact, heat will flow from the hotter object to the cooler one until both objects reach the same temperature. Temperature can be affected by many factors, such as the weather, the amount of sunlight, and the activity of the particles in a substance.

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Answer:

where u put it last time or retrace ur steps to where u last put it

Answer:

b

Explanation:

Answer:

bnkjlji

Explanation:

Friction affects the motion of two objects sliding past each other. This frictional force results into the loss of energy and hence slow down the motion of the two objects in contact.

Frictional force is the force that is resisting the relative motion of solid surfaces, fluid layers, and the two material elements which are sliding against each other. There are several types of friction such as dry friction, it is a force that opposes the relative lateral motion of the two solid surfaces which are in contact.

Frictional force generates when the two surfaces slide past one another in motion. The force of friction opposes the motion of an object which is in contact, causing the moving objects to lose energy and slow down. The frictional force is important as it helps us in walking, driving a car, and in doing other works.

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Answer:

Both will have the same momentum.

P = M v     momentum

v = a t   for uniform acceleration

P = M a t

But a = F / M

P = M (F / M) t = F t    so both have the same momentum

In an equal circuit, all parts are associated across one another, subsequent in precisely two arrangements of electrically normal places.

The complete power in a series circuit is equivalent to the amount of power disseminated by the individual resistors.

The complete power disseminated will be equivalent to the amount of the power dispersed by every individual obstruction. Contingent upon the qualities that are known, blends of the power equation, also as Ohm's regulation, can be utilized to work out power disseminated (or some other obscure worth).

An equal circuit disseminates more power than a series circuit. For similar arrangements of resistors, the complete obstruction of the equal circuit is consistently lower than the all-out opposition in a series circuit.

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Answer:

0.27km

Explanation:

tanA=\(\frac{a}{b}\)

a=btanA

a=(0.75km)tan20

=0.27km

Given data

*The given radius of the wheel is r = 30.0 cm = 0.30 m

*Rate of rotation is 2.30 revolutions every 0.0810 s

The angle of the wheel rotates in one second is calculated as

Hence, the angle of the wheel rotating in one second is 178.32 radian

The formula for the linear speed of a point on the wheel's rim is given as

Substitute the known values in the above expression as

Frictional force is the force that causes an object to slow down when it touches another object. Thus, the correct option is C.

Frictional force of an object is the force which is generated by the two surfaces which generate due to their contact and slide against each other. A few factors which affect the frictional force are that these forces are mainly affected by the surface texture of the object and the amount of force impelling them together.

Frictional force is mainly of four types which include static friction, sliding friction, rolling friction, and the fluid friction. The frictional force can be given by the formula: F = μN, where μ is a constant.

Therefore, the correct option is C.

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Answer:

Explanation:before the phase change the substance is a particle.

The paragraph primarily discusses the concept of overwinding old clocks and its consequences, indicating that overwinding clocks used to be a common mistake. Here option D is the correct answer.

The paragraph explains that overwinding occurs when the mainspring is almost fully wound, but the operator continues to turn the winding key, resulting in the spring coiling too tightly or even breaking.

This suggests that overwinding was a mistake commonly made in the past when operating old-fashioned clocks. The other options, such as clocks changing over the years or clocks becoming fragile with age, are not directly addressed in the paragraph and are therefore less supported.

The option e. "time flies when you're having fun" is unrelated to the paragraph and can be disregarded as an irrelevant answer choice. Hence option D is the correct answer.

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The solution to the one dimensional Schrödinger equation for harmonic oscillator potential is given by:

ψn(x) = (1/√2n!) (mω/πh)1/4 exp(−mωx2/2h)Hn(√mωx/h)

where,

Generally, The Schrödinger equation is a fundamental equation in quantum mechanics which describes the time-dependent behavior of a system.

It is a partial differential equation that governs the behavior of a system's wave function, which describes the probability of a particle's location and momentum.

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Answer:

The two answers that are likely to be true are:

She will think of the results as an opportunity to find joy.

She will identify areas for self-development in her results.

By setting her mind on growth, Jackie is likely to approach the personality test with a positive and open mindset. This can lead to the following outcomes:

She will think of the results as an opportunity to find joy: Jackie may view the test results as a chance to discover aspects of her personality that bring her joy and satisfaction. She might focus on finding strengths and positive qualities that can contribute to her personal and professional growth.

She will identify areas for self-development in her results: Rather than viewing the test results as fixed labels or limitations, Jackie is likely to see them as valuable feedback for self-improvement. She may actively seek out areas where she can further develop her skills, knowledge, and personality traits to enhance her personal and career growth.

It's important to note that the other options listed in the question (1. She will score high in the areas she chooses to and 2. She will respond based on what's best in her desired career path) are not directly related to having a growth mindset. They suggest a more biased or strategic approach to the test, which may not align with the concept of growth and self-improvement.

Answer: 12 ounce steak on venus

Explanation: venus = closer to the sun. The sun = more potential gravity, which would make it heavier than a quarter pound hamburger on jupiter.

Explanation:

Fgravity = G*(mass1*mass2)/D²

G is the gravitational constant, which has the same value throughout our universe.

D is the distance between both objects.

now, we change these numbers

Fgravitynew = G*(2*mass1*2*mass2)/(1/2 * D)² =

= G*(4*mass1*mass2)/(D²/4) =

= 4* (G*(mass1*mass2)/D²) *4 =

= 16* (G*(mass1*mass2)/D²) = 16*Fgravity

so, the new gravitational force will be 16×F.

The net power radiated by the Earth in free space is approximately

1.2 x 10^ 17 W watts.

To calculate the net power radiated by the Earth in free space, we can use the Stefan-Boltzmann Law:

Power = σ * A * ε * (T^4 - T0^4)

where:

σ is the Stefan-Boltzmann constant (5.67 x 10^-8 W/m^2K^4)

A is the surface area of the Earth (4πR^2, where R is the radius of the Earth)

ε is the emissivity of the Earth (0.8)

T is the temperature of the Earth surface (270 K)

T0 is the temperature of space (2 K)

Plugging in the values, we get:

Power = 5.67 x 10^-8 * 4πR^2 * 0.8 * (270^4 - 2^4)

The radius of the Earth is approximately 6.37 x 10^6 m, so:

Power = 5.67 x 10^-8 * 4π(6.37 x 10^6)^2 * 0.8 * (270^4 - 2^4)

Power ≈ 1.193 x 10^ 17 W

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