Why are wildfires getting worse ? Does is have to do with Climate Change ?

Answer:

hope it helps

Explanation:

The rule is

\(\boxed{\sf \nu _n=n\nu_1}\)

So

For n=1

\(\\ \rm\Rrightarrow \nu_1=1(120)=120Hz\)

For n=2

\(\\ \rm\Rrightarrow \nu_2=2(120)=240Hz\)

for n=3

\(\\ \rm\Rrightarrow \nu_3=3(120)=360Hz\)

The minimum amount of time taken by the receiver jet to catch up with the tanker jet is 100 seconds, rounded to the nearest second.

Let's assume that the receiver jet accelerates at the maximum rate (1.05g) until it reaches the same speed as the tanker jet, and then coasts for the rest of the journey.

The time taken for the receiver jet to reach the same speed as the tanker jet can be calculated using the following formula:

t = v / a

where

v = final speed - initial speed

a = acceleration (1.05g)

The initial speed of the receiver jet is 360 km/hr = 100 m/s. The final speed is the same as the tanker jet, which is 360 km/hr = 100 m/s.

So, v = 100 m/s - 100 m/s = 0

a = 1.05 * 9.8 m/s^2 = 10.29 m/s^2

t = v / a = 0 / 10.29 m/s^2 = 0 s

Since the receiver jet reached the same speed as the tanker jet in zero seconds, it will continue to fly at a constant speed of 100 m/s for the rest of the journey. The distance that the receiver jet needs to cover can be calculated as follows:

d = v * t

where

v = 100 m/s (speed of the receiver jet)

t = time taken to cover the distance (to be calculated)

Since the tanker jet was initially 10 km ahead of the receiver jet, the distance that the receiver jet needs to cover is 10 km = 10,000 m.

t = d / v = 10,000 m / 100 m/s = 100 s

So, the minimum amount of time taken by the receiver jet to catch up with the tanker jet is 100 seconds, rounded to the nearest second.

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The kinetic energy of an object is the energy possessed by the object due to its motion. That is when the velocity of the object is zero, i.e., when the object is at rest, the kinetic energy of the object will be zero.

The linear momentum is the product of the mass and the velocity of an object. When the momentum of the object is zero, the velocity of the object is also zer.

Thus whenever a particle has a zero momentum, its velocity and hence its kinetic energy will also be equal to zero.

Therefore, the given statement is true.

According to the given statement, the impact speed of the apple falling from a height of 2.3 m is approximately 6.724 m/s.

The impact speed of an apple falling from a height can be calculated using the principles of free fall and gravitational acceleration.

Step 1:

Determine the acceleration due to gravity (g):
The acceleration due to gravity on Earth is approximately 9.8 m/s². We'll use this value for our calculation.

Step 2:

Determine the time it takes for the apple to fall:
To find the time it takes for the apple to fall, we can use the equation s = (1/2)gt², where s is the vertical distance fallen and t is the time. In this case, the distance fallen is 2.3 m. Rearranging the equation, we have t = √(2s/g).

t = √(2 * 2.3 / 9.8) ≈ √0.469 ≈ 0.686 seconds.

Step 3:

Calculate the impact speed:
The impact speed can be determined using the equation v = gt, where v is the speed and t is the time.

v = 9.8 * 0.686 ≈ 6.724 m/s.

Therefore, the impact speed of the apple falling from a height of 2.3 m is approximately 6.724 m/s.

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When measuring the battery base voltage with a voltmeter, the vehicle engine should be running and all the accessories should be turned off and potential difference.

Thus, The term "voltmeter" refers to the instrument used to measure the electric potential difference between two locations in an electric circuit. It is connected at the same time.

Analogue voltmeters, which move a pointer around a scale in proportion to the voltage sensed, can be made using a galvanometer and a series resistor. Meters that use amplifiers can measure microvolts or less. An analog-to-digital converter is used by digital voltmeters to display voltage as a numerical value.

A wide range of designs are available for voltmeters, some of which are powered independently (by a battery, for instance) and others of which are powered directly by the source of the voltage that is being measured.

Thus, When measuring the battery base voltage with a voltmeter, the vehicle engine should be running and all the accessories should be turned off and potential difference.

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The conversion of 100mg/dL or 0.10g/dL to drinks depends on the type of alcoholic beverage and the individual's body weight and metabolism. Generally, one standard drink contains around 14 grams of alcohol, which is equal to 140mg/dL or 0.14g/dL in the blood. Therefore, to estimate the number of drinks equivalent to 100mg/dL or 0.10g/dL, we need to divide the alcohol content in the blood by the standard alcohol content per drink.

In this case, 100mg/dL or 0.10g/dL in the blood would be equivalent to around 0.7 standard drinks. However, it's important to note that this is an estimate and not an accurate measurement since several factors can influence an individual's blood alcohol concentration. Moreover, it's crucial to drink responsibly and avoid driving or engaging in any activities that require alertness and coordination when under the influence of alcohol.

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A 600-w TV receiver is turned on for 4 hours with nobody watching it. If electricity costs 10 cents/kWh, the amount of money wasted is cents. Therefore, the amount of money wasted in this case is 24 cents.

There are different steps to calculate the money wasted in this case. Here is the step-by-step solution to this problem:

First, we need to calculate the energy consumed in kWh:

Energy consumed = Power × Time Power = 600 W Time = 4 hours

Energy consumed = Power × Time Energy consumed = 600 W × 4 hours

Energy consumed = 2400 Wh.

To convert Wh into kWh, we need to divide the energy consumed by 1000:

Energy consumed = 2400 Wh = 2.4 kWh.

Now, we can calculate the amount of money wasted:

Cost of 1 kWh = 10 cents Cost of 2.4 kWh = 2.4 kWh × 10 cents/kWh

Cost of 2.4 kWh = 24 cents.  

A 600-w TV receiver is turned on for 4 hours with nobody watching it. If electricity costs 10 cents/kWh, the amount of money wasted is cents. The energy consumed by the TV receiver can be calculated by multiplying the power rating by the time it is used. In this case, the power rating is 600 W, and the time is 4 hours.

Therefore, the energy consumed is 600 W × 4 hours = 2400 Wh.

To convert the energy consumed into kWh, we need to divide it by 1000. So, 2400 Wh = 2.4 kWh. The cost of electricity is 10 cents per kWh.

Therefore, the cost of 2.4 kWh is 2.4 kWh × 10 cents/kWh = 24 cents.

This is the amount of money wasted by keeping the TV receiver turned on for 4 hours without anyone watching it. It is important to turn off electrical appliances when they are not in use to save electricity and reduce the electricity bill.

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The distance between the two buses is 48km.

Let us assume that the velocity of the first bus is 36 km/h and that of the second bus is 108 km/h.

To find the distance between them, we will consider that both buses move in opposite directions.

Distance travelled by bus 1 in 20 minutes = 36 km/h × 20 min ÷ 60 min/h = 12 km

Distance travelled by bus 2 in 20 minutes = 108 km/h × 20 min ÷ 60 min/h = 36 km

Total distance between them = distance travelled by bus 1 + distance travelled by bus 2= 12 km + 36 km= 48 km

Therefore, the distance between them in 20 minutes is 48 km.

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Very accurate measurements over a wide range of pressure have been made for large number of real gases.

The product of P cross product with V is not constant for any gases.

The real gases the dependence shows the deviation in partial pressures of individual gas molecules and azeotropes.

The curves extrapolated with compressibility factor with the constant product for some gases if pressures are very low.

\(\alpha =\frac{Pv}{RT}\\ \\\alpha =\left \{ {{1 - ideal} \atop {\neq 1-real}} \right.\)

From Charles law the volume approaching to zero means pressure attaining infinite value. The compressibility factor is an index of deviation from ideality.

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Explanation:

M1U1+m2u2 = (m1+m2)vf

m1= 10kg

u1=5

m2=25

u2=0

vf=?

10×5+25×0=35 vf

50+0=35Vf

Vf=1.4m/s

The fact of nature that allows us to determine the (inertial) mass of an object simply by weighing it, instead of having to arrange a collision between it and the standard kilogram is that the force of gravity on an object is proportional to its inertial mass, and the option that represents this fact is an option (d).

According to Newton's second law of motion, the force acting on an object is directly proportional to its inertial mass. In the case of weighing an object, we are measuring the force of gravity acting on it. The weight of an object is the force exerted by gravity on that object.

By using a balance or a weighing scale, we can measure the force of gravity acting on the object, which is directly related to its inertial mass. This relationship allows us to determine the inertial mass of the object without the need for arranging a collision with a standard kilogram or involving conservation laws like momentum or energy.

Therefore, the correct answer is (d) That the force of gravity on an object is proportional to its inertial mass.

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The normal force of the knife edge at the 20 cm mark is 0.28 N.

The normal force of the knife edge at the 20 cm mark can be found using the equation for the balanced torque about the 90 cm mark of the meter stick.

T = Fd

where T is torque, F is force, and d is the lever arm or the distance from the point where the torque is being calculated.

Let x = normal force of the knife edge at the 20 cm mark

Choose the 90 cm mark as the point of rotation since the normal force here is not necessarily needed.

T_clockwise = T_counter clockwise

x(70 cm) + (200g)(1 kg / 1000 g)(9.8 m/s²) = 100 g(1 kg / 1000g)(9.8 m/s)

x = 0.28 N

Hence, the normal force of the knife edge at the 20 cm mark is 0.28 N.

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Explanation:

list and discuss five strategies you would use to the teacher to improve discipline in your class and create a conductive environment

A truck accelerating at 0.0083 meters/second2 covers a distance of 5.8 ×\(10^4\) meters. If the truck's mass is 7,000 kilograms, the work done to reach this distance is 3.3× \(10^6\) joules.

The correct answer is option E.

To calculate the work done by the truck to cover a distance of 5.8 × \(10^4\)meters, we need to use the equation for work:

Work = Force × Distance

In this case, the force can be calculated using Newton's second law:

Force = mass × acceleration

Where:

Acceleration (a) = \(0.0083 meters/second^2\)

Distance (d) = 5.8 ×\(10^4\) meters

Mass (m) = 7,000 kilograms

First, let's calculate the force exerted by the truck:

Force = mass × acceleration = (7,000 kg) ×\((0.0083 meters/second^2)\)= 57.1 Newtons

Next, we can calculate the work done:

Work = Force × Distance = (57.1 N) × (5.8 × 10^4 meters) = 3.3158 × \(10^6\)joules

Rounded to the nearest significant figure, the work done by the truck is approximately 3.3 × \(10^6\) joules.

Therefore, the correct answer is E.

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The question probable may be:

A truck accelerating at 0.0083 meters/second2 covers a distance of 5.8 ×\(10^4\)meters. If the truck's mass is 7,000 kilograms, what is the work done to reach this distance?

A. 1.7 × \(10^6\) joules

B. 3.4 ×\(10^6\) joules

C. 5.6 × \(10^6\)joules

D. 6.8 ×  \(10^6\)joules

E. 3,3  ×\(10^6\)  joules

It is impossible to for a heat engine to be 100 % efficient because  

The basic principle behind a heat engine is to convert thermal energy (heat) into useful work. A heat engine works by absorbing heat from a high temperature source and converting it into work, and then rejecting the remaining heat to a low temperature sink. The efficiency of a heat engine is defined as the ratio of the work output to the heat input.

However, it is impossible for a heat engine to be 100% efficient because some heat is always lost to the environment. This lost heat is due to various factors such as friction, thermal conduction, and other sources of inefficiency within the heat engine.

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According to the research, the correct option is C. It makes bones and muscles stronger is a long-term benefit of increased physical activity.

It refers to the set of movements and actions that work the muscles, promoting energy consumption, therefore, performing physical activity frequently is essential for maintaining health.

These physical activities consume many calories and help the person not to be overweight, improving the elasticity of muscles and joints, increasing lung capacity and reducing the risk of cardiovascular disease.

Therefore, we can conclude that according to the research, the correct option is C. It makes bones and muscles stronger is a long-term benefit of increased physical activity.

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Answer:

11m/s²

Explanation:

Given parameters:

Mass of object  = 10g  = 0.01kg

Radius  = 5cm  = 0.05m

V = 0.75m/s

Unknown:

Centripetal acceleration  = ?

Solution:

Centripetal acceleration is the acceleration of a body in circular path. It can be derived using;

     a  = \(\frac{v^{2} }{r}\)  

v is the velocity

r is the radius

Now, insert the parameters;

         a  = \(\frac{0.75^{2} }{0.05}\)   = 11.25m/s²

The strength of the magnetic field is approximately 2.8 mT.

The equation is:

Φ = B × A × cos(θ)

You are given the magnetic flux (Φ = 4.7 × \(10^-^5\) \(Tm^2\), the angle (θ = 37°), and the dimensions of the rectangular area (6.2 cm x 7.5 cm). First, we need to calculate the area (A):

A = length × width = 6.2 cm × 7.5 cm = 46.5 \(cm^2\)

= 0.00465 \(m^2\)

Next, rearrange the magnetic flux equation to solve for the magnetic field (B):

B = Φ / (A × cos(θ))

Now, plug in the given values and calculate the magnetic field:

B = (4.7 ×\(10^-^5\) \(Tm^2\)) / (0.00465\(m^2\)× cos(37°)) ≈ 0.00283 T

Finally, convert the magnetic field strength to milli tesla (mT) and express it using two significant figures:

B = 0.00283 T × 1000 mT/T ≈ 2.8 mT

So, the strength of the magnetic field is approximately 2.8 mT.

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Answer:

yeah

Explanation:

the answer is right.

From the calculation, the mass of the dummies head is 1647.44 Kg

We know that the momentum after collision is equal to the momentum before collision.

Mass of the headrest = 2005.6 kg

Initial velocity of the head rest = 4.524 m/s

Final velocity of the head rest =  4.487 m/s

Mass of the dummy = m

Initial velocity of the dummy = -1.005 m/s

Final velocity of the dummy = 9.965 m/s

Then;

(m *  -1.005) + (2005.6 * 4.524 ) = (2005.6 *   4.487) + (m * 9.965)

-1.005m + 9073.33 = 8999.13 + 9.965m

9073.33 - 8999.13  = 9.965m + 1.005m

18072.46 = 10.97m

m = 18072.46/ 10.97

m = 1647.44 Kg

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The type of asteroid that would appear darkest and reflect the least light is type option E) S.

Among the given options, type E) S asteroids would appear darkest and reflect the least amount of light. Asteroids are classified into different types based on their composition, and type S asteroids belong to the silicate group. They are made up of rocky materials, such as silicates and metals, and they tend to have a relatively low albedo.

Albedo refers to the amount of light an object reflects, and a low albedo means that the object absorbs more light than it reflects. As a result, type S asteroids appear darker because they absorb a significant portion of the incident light rather than reflecting it. Their dark appearance is due to their composition and surface properties.

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The final velocity of the ball, given that it was thrown downwards with a velocity of 1.5 m/s is 27.078 m/s

First, we shall list out the various parameters given from the question. This is given below:

The final velocity of the ball can be obtained by using the following equation of motion:

v = u + at

Inputting the values, we have:

v = 1.5 + (9.8 × 2.61)

Clear bracket

v = 1.5 + 25.578

v = 27.078 m/s

Thus, from above calculation, it is evident that the final velocity of the ball is 27.078 m/s

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The reason that the melting point of table salt is higher than that of sugar is A, the particles of salt are attracted more strongly than those of sugar.

Melting point is measured by heating a substance until it melts and then recording the temperature at which melting occurs. This is typically done using a device called a melting point apparatus or a melting point apparatus.

The sample is placed in a small capillary tube and inserted into the melting point apparatus, which heats the sample gradually and detects the temperature at which the first signs of melting are observed. The temperature is recorded as the melting point of the substance.

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Image transcribed and translated:

What is the reason that the melting point of table salt is higher than that of sugar?

A. The particles of salt are attracted more strongly than those of sugar.

B. The particles of sugar are attracted more strongly than those of salt.

C. The particles of salt are attracted more weakly than those of sugar.

D. The particles of sugar repel while those of salt attract.

Answer:

895522 times faster.

Explanation:

From the question given above, the following data were obtained:

Speed of sound in air (v) = 335 m/s

Speed of light in air (c) = 3×10⁸ m/s

How many times faster =.?

To obtain how many times faster light travels in air than sound, do the following

c : v => 3×10⁸ : 335

c/v = 3×10⁸ / 335

c/v = 895522

Cross multiply

c = 895522 × v

From the illustrations made above, we can see that the speed of the light in air (c) is 895522 times the speed of sound in air.

Thus, light travels 895522 times faster than sound in air.

Answer:

- increasing the distance between the objects

- decreasing the mass of one of the objects

- decreasing the mass of both objects

Explanation:

Got it right on Edge 2020.

The gravitational force is decreased by increasing the distance between the objects or decreasing mass of one or both of the objects

According to Newton's law of Universal Gravitation;  The force of gravity is directly proportional to the product of the masses between two bodies and inversely proportional to the square of the distance between them.

F = Gm1m2/r^2

Where;

We can see from the formula above, that the following will result in the decrease of the force between two objects;

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Velocity of boat = 0.866 m/s

Solution Given:

Let the velocity of the boat = V m/s

Cos 30°=\( \frac{adjacent }{hypotenuse} =\frac{0.75}{V }\)

\( \frac{0.75}{V}\) = 0.8660

∴ V = \(\frac{0.75}{0.8660}\)

V = 0.866 m/s

(A). The wavelength decreases by a factor of 3.

Hi ! We all know that all type of electromagnetic wave, will have the same velocity as the speed of light, because light is part of electromagnetic wave too. The value of it is 300,000 km/s or \( \sf{3 \times 10^8} \) m/s. As a result of this constant property, the shorter the wavelength, the greater the value of the electromagnetic wave frequency. This relationship can also be expressed in this equation:

\( \boxed{\sf{\bold{c = \lambda \times f}}} \)

With the following condition :

In this problem, we underline one concept, namely : "the shorter the wavelength, the greater the value of the electromagnetic wave frequency". In question, the frequency of the waveform will increase by a factor of 3 from the beginning. So, to keep this value constant, the wavelength should be reduced by a factor of 3 from the initial condition.

Assume that:

Let we count :

Step by step :

\( \sf{c = c'} \)

\( \sf{\lambda \times f = \lambda' \times f'} \)

\( \sf{\cancel{\lambda} \times \cancel f = x \cancel{\lambda} \times 3 \cancel{f}} \)

\( \sf{1 = 3x} \)

\( \sf{x = \frac{1}{3}} \) (Q.E.D)

So, if the frequency value is increased by a factor of 3 from its original, then the wavelength will decrease by a factor of 3 from the original.

Answer:

See below

Explanation:

momentum = m * v

so

momentum / v = m   =   32 000 kg m/s / 20 m/s = 1600 kg