A van traveling down a slope with a uniform acceleration of 2. 15 meters/second2 attains a speed of 20. 00 meters/second after 7. 00 seconds. What is the initial velocity of the van? A. 0. 00 meters/second B. 3. 65 meters/second C. 4. 95 meters/second D. 35. 05 meters/second E. 120. 75 meters/second.

Answer:

If resistance is increased, the current decreases and if the resistance is decreased, the current flowing through the wire increases.

Explanation:

V = IR is ohm's law which implies I = V/R, where I is the current and V is the voltage and R is the resistance. Hence, I is inversely proportional to R.

The question addresses the stability of the atmosphere and the factors that determine convective stability or instability. It also explains the difference between the adiabatic lapse rate of dry air and wet saturated air.

a) The stability of the atmosphere is determined by the temperature profile and relative densities of the air cell and atmosphere. If the temperature of the surrounding atmosphere decreases with altitude at a rate greater than the adiabatic lapse rate of the air cell, the atmosphere is considered convectively stable.

In this case, the air cell will return to its original position. Conversely, if the temperature of the surrounding atmosphere decreases slower than the adiabatic lapse rate of the air cell, the atmosphere is convectively unstable. The air cell will continue moving in the same direction.

b) The adiabatic lapse rate refers to the rate at which temperature decreases with altitude for a parcel of air lifted or descending adiabatically (without exchanging heat with its surroundings). The adiabatic lapse rate of dry air is higher (around \(9.8^0C\) per kilometer) compared to the adiabatic lapse rate of wet saturated air (around 5°C per kilometer).

This difference arises because when water vapor condenses during the ascent of saturated air, latent heat is released, reducing the rate of temperature decrease. A diagram can illustrate the difference between the two lapse rates, showcasing their respective slopes.

c) When wet unsaturated air rises from the ocean surface, its temperature decreases at a rate equal to the dry adiabatic lapse rate. However, if the ambient lapse rate (temperature decrease with altitude) is higher than the adiabatic lapse rate for dry air, a temperature inversion layer forms at higher altitudes.

In this inversion layer, the temperature increases with altitude instead of decreasing. A schematic diagram can depict the temperature changes of the wet air in comparison to the ambient temperature, showing the inversion layer.

Cumulus clouds form at the altitude where the rising moist air reaches the level of the temperature inversion layer. These clouds are formed due to the condensation of water vapor as the air parcel cools to its dew point temperature.

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Answer:

The Answer is gonna be True

Explanation : A hydrogen bond is a weak type of force that forms a special type of dipole-dipole intermolecular attraction when a hydrogen atom is bonded directly to one of the most electronegative elements like nitrogen (N), oxygen (O) or fluorine (F). This causes the hydrogen to acquire a significant amount of positive charge.

Or

Hydrogen bond is an attractive force between a partially positive charged hydrogen and a partially negative charged atom (oxygen and nitrogen). This is a very weak bond and strength of hydrogen bond (5-10 Kcal per bond) is much less than the strength of covalent bond. Hydrogen bonds are usually showed as dotted lines between two atoms.

This is the Answer for your question :3

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Answer: The attraction of opposite charges between hydrogen and oxygen does not form a weak bond because oxygen-hydrogen makes hydrogen bonding. Hydrogen bonding is a very attraction force

We can use the formula:v = u + atwhere:v = final velocity of the sprinter, which is 2.0 m/su = initial velocity of the sprinte, , the magnitude of the friction force is 300 N.

To determine the magnitude of the friction force, use the formula for force, F=ma, where m is the mass of the sprinter and a is the acceleration of the sprinter. The friction force is equal in magnitude and opposite in direction to the force of the sprinter's foot pushing backward against the ground.

Mass of the sprinter,

m = 60 kgTime the sprinter's foot is on the ground,

t = 0.40 sInitial velocity of the sprinter, u = 0 m/sFinal velocity of the sprinter,

v = 2.0 m/sWe need to calculate the friction force acting on the sprinter.To do this, we first need to calculate the acceleration of the sprinter. We can use the formula:v = u + where:

v = final velocity of the sprinter, which is 2.0 m/s

u = initial velocity of the sprinter, which is 0 m/st = time for which the foot is on the ground, which is 0.40 s

Substituting these values, we get:2.0

= 0 + a(0.40)Simplifying, we get:

2.0 = 0.4a

Dividing both sides by 0.4, we get:

a = 5 m/s² Substituting the values, we get:

F = 60 × 5F = 300 N

Therefore, the magnitude of the friction force is 300 N.

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If a car travels 520 miles and uses 26 gallons of gas, the constant of variation or miles per gallon is 20.

When two variables are said to be directly proportional, it means that they have a constant ratio. In this case, the distance traveled by a car is directly proportional to the amount of gasoline used.

Let's denote the distance traveled by 'd' and the amount of gasoline used by 'g'. Then we can write this relationship as:

d ∝ g

This can also be written as:

d = k * g

Where k is the constant of variation or miles per gallon. It represents the number of miles that can be traveled using one gallon of gasoline.

To find the value of k, we can substitute the given values of distance and gasoline in the above equation:

520 = k * 26

Simplifying this equation, we get:

k = 520 / 26

k = 20

This means that the car can travel 20 miles for every gallon of gasoline used.

In summary, the distance traveled by a car varies directly as the amount of gasoline used. The constant of variation or miles per gallon represents the number of miles that can be traveled using one gallon of gasoline. To find the constant of variation, we can use the given values of distance and gasoline and solve for k using the equation d = k * g.

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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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Answer:

gas vibrates and moves freely at high speeds.

Explanation:

Hope this helps

Answer:

v = 16.98 km/s

Explanation:

Given that,

Distance, d = 4500 km

Time, t = 265 s

We need to find its average speed. The total distance covered divided by total time taken is called average speed of an object. So,

\(v=\dfrac{4500\ km}{265\ s}\\\\=16.98\ km/s\)

So, the average speed is 16.98 km/s.

The car will travel a distance of 180 meters in 12 seconds.

To determine the distance traveled by the car, we can use the equation of motion:

Distance (d) = Initial velocity (v₀) × time (t) + 0.5 × acceleration (a) × time squared (t²)

Given:

Initial velocity (v₀) = 0 m/s (starting from rest)

Acceleration (a) = 2.5 m/s²

Time (t) = 12 seconds

Plugging in the values into the equation:

Distance (d) = 0 × 12 + 0.5 × 2.5 × 12²

Distance (d) = 0 + 0.5 × 2.5 × 144

Distance (d) = 0 + 0.5 × 2.5 × 144

Distance (d) = 180 meters

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Answer:

-to defend territory

-to support allies

-to protect economic interests

Explanation:

100% on edge

A nation most likely uses military force-

To defend the nation and its population from immediate danger, military superiority contributes to the maintenance of peace and stability in areas crucial to national interests and finances international security commitments.

The current method used by countries to obtain emergency recruits during times of conflict is drafting. This act, known as conscription in medieval and ancient periods, frequently involved taking young boys against their will from their homes.

Most of the time, leadership is crucial. The Army upholds national laws, accomplishes national goals, and prevents any nation's aggressive actions in order to maintain peace.

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Answer:

Option B

"Packets" of electromagnetic energy eject electrons.

Explanation:

A photon is a tiny packet of light. Light as we know is a form of electromagnetic energy. Whenever light is incident on a photoelectric surface, the energy of the light wave gets transferred to the electron, causing it to have enough energy to eject electrons from its surface. The electrons, once ejected, are now free to move about, thus, resulting in the flow of electrical current.

This makes option B the correct answer

Answer:

Maximum height = 1.96 (Approc)

Total time = 1.26 second

Explanation:

Given:

Final velocity v = 6.2 m/s

Find:

Maximum height

Total time

Computation:

v² = u² + 2as

6.2² = 2(9.8)s

S = 1.96 m Approx

Maximum height = 1.96 (Approc)

v = u + at

6.2 = (9.8)(t)

Total time = 0.63 x 2

Total time = 1.26 second

The statement that describes energy of the roller coaster as it slows down while travelling to the top of the coaster is 'The cart loses kinetic energy and gains potential energy.'

Consider three roller coaster points that are each at a different height from the ground. If we disregard all frictional and drag forces and focus just on the conservative forces acting on the roller coaster car, we may assume that all kinetic and potential energy is conserved. As a result, energy only transforms from one form to another.

When the roller coaster vehicle hits the bottom, it will have reached its maximum level of kinetic energy since all of the gravitational potential energy has been transformed into kinetic energy.

At the top of the roller coaster, the object has its maximum gravitational potential energy and none at all (assumed there is no velocity). As the object begins to fall to the bottom, its gravitational potential energy falls and its kinetic energy increases.

Hence, as the cart reaches the top, it slows down because it loses kinetic energy and gains potential energy.

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Answer:

a) 8m.\(s^{-2}\)

b) 6.4N

Explanation:

a)Using \(s=ut+1/2at^{2}\)

s=16

u=0

t=2

a=?

16=1/2a(4)

a=8m.\(s^{-2}\)

b) F=ma

Where m is in kg

Convert 800g to kg

800/1000=0.8kg (1000g in a kg)

F= 0.8 x 8 = 6.4N

Answer:

6.0 m/s vertical and 9.0 m/s horizontal

Explanation:

For the vertical component, we use the formula:

Then we solve for y:

And for the horizontal component, we use the formula:

Then we solve for x:

So the answer is " 6.0 m/s vertical and 9.0 m/s horizontal".

Answer:

The branch of biology that deals with the normal functions of living organisms and their parts.

Answer:

Distance =400m

Time=20s

As we know that

\({\boxed{\sf speed \dfrac {Distance {}_{(d)}}{Time {}_{(t)}}}}\)

\(\LARGE\leadsto\sf speed=\dfrac {400}{20}\)

\(\LARGE\leadsto\sf 20m/s\)

Answer:

the time required is 0.886 seconds

Explanation:

The computation is shown below:

As we know that the content of the chemical energy that has a calorific value of hydrogen is 141790 kJ /kg

And, the total energy stores is 100,000 kg

Now

E = 141790 ×  100,000 kJ

= 14.179 TJ

The time would be

T = E ÷ P

= 14.179 ÷ 16

= 0.886 sec

hence the time required is 0.886 seconds

The proper sequence of eye layers from the outermost to the innermost layer are Sclera, Choroid, Retina.

Sclera: The outermost layer of the eye is the tough and fibrous sclera, also known as the white of the eye. It provides structural support and protection to the inner layers of the eye.

Choroid: The middle layer of the eye is the choroid, which is rich in blood vessels. It supplies oxygen and nutrients to the retina and helps regulate the amount of light entering the eye.

Retina: The innermost layer of the eye is the retina, which contains specialized cells called photoreceptors that detect light and convert it into electrical signals. These signals are then transmitted to the brain via the optic nerve for visual processing.

Within the retina, there are two main types of photoreceptor cells: rods and cones. Rods are responsible for vision in low light conditions, while cones are responsible for color vision and visual acuity in bright light.

It is important to note that the order of these layers may vary slightly depending on the specific structures or regions of the eye being referred to, but the general sequence from outermost to innermost is as described above.

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Answer:

talking and we can make our own sound

Explanation:

Sound could be an element for detecting people or entities, This is very useful for blind people. Sounds could also heal your chakra or make you feel like dancing.

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Compared to the rod of length L, the rod of length 2L has The same stress and same strain.

Since we know that Tensile Stress is determined by the relation :

Tensile Stress =  \(\frac{F}{A}\)

Where F is the force applied and A is the circular area, which will definitely remain same for both of the rods as they have same diameter.

aslo the Tensile Strain, which is dependent on the young's modulus and stress which would remain same for both of the rods as the material used is same and the stress is alo the same.

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The speed of the blue dot when it is 0.80 m above the road is 11.2 m/s

d = diameter of tire = 0.80 m

r = radius of tire = (0.5) d = (0.5) (0.80) = 0.40 m

v = speed of bicycle = 5.6 m/s

w = angular speed of the tire

Speed of cycle is given as

v = r w

5.6 = (0.40) w

w = 14 rad/s

Radians per second. ω ω = 14 rad/s

Calculation2:

v' = speed of blue dot

Speed blue of dot is given as

v' = v + rw

v' = 5.6 + (0.40) (14)

v' = 11.2 m/s

The speed of the blue dot when it is 0.80 m above the road is 11.2 m/s

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Question:

Express your answer in radians per second. ω ω = 14 rad/s Previous Answers Correct Part B What is the speed of the blue dot when it is 0.80 m above the road?

In order to reach the maximum height of 2 meters, Kangaroo should jump with an initial speed of 6.26 m/s.

The three equations of motion are -

first law → v = u +at

second law → S = ut + 1/2 at²

Third law → v² - u² = 2aS

Given is a kangaroo who jumped 2 meters high.

Assume that the kangaroo jumped with an initial velocity of 'u' m/s.

The maximum height achieved is 2 meters.

Acceleration due to gravity will be -9.8 m/s²

At maximum height, the velocity will be zero. Therefore, the final velocity 'v' will be zero. Using third law →

v² - u² = 2aS

- u² = - 2gS  

u² = 2gS

u² = 2 x 9.8 x 2

u² = 39.2

u = 6.26 m/s

Therefore, in order to reach the maximum height of 2 meters, Kangaroo should jump with an initial speed of 6.26 m/s.

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The work done by the gas for question A will be 4.2 * 10^5 J.

The change in internal energy of the gas for question B is 6.43 * 10^5 J.

For a gas, it is the product of the pressure P and the volume V during a change of volume. The formula for work done in gas is W (work) = P (pressure) * V (volume)

Now, let's calculate the work done by gas to answer question A.

Work = Pressure * (Volume 2 - Volume 1)

= 1 atm * (16.2 - 12)

= 10^5 Pa * 4.2

= 4.2 * 10^5 J

So the work done by the gas is 4.2 * 10^5 J.

Now, let's find the change in internal energy of the gas.

The heat energy added to the system is

Q = 254kcal

= 254kcal * (4184J / 1 kcal)

= 1.063 * 10^6 J

The change in internal energy of gas is

ΔU = Q (the heat energy added) - W (work done by gas)

= 1.063 * 10^6 J - 4.2*10^5 J

= 6.43 * 10^5 J

Therefore, the change in internal energy of the gas is 6.43 * 10^5 J

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The firm's asset turnover ratio is calculated as to be equal to 0.25. The formula for Asset Turnover Ratio is as : Net sales / Average total assets.

It is given that : ROA= 12.5%, Net income= $800,000, Net sales= $1,600,000

Asset Turnover Ratio is calculated as follows:

Asset Turnover Ratio=Net sales / Average total assets

The numerator is already given to us in the problem statement, and we can calculate the denominator by applying the formula for Return on Assets (ROA).

ROA=Net Income/ Average total assets

Average total assets= Net Income/ ROA

= 800000 / 0.125

= 6400000

Thus, Asset Turnover Ratio

= 1600000 / 6400000

= 0.25

Therefore, the firm's asset turnover ratio is 0.25.

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Answer:

Explanation:

MLT^-2

.....

Answer:

A voltage-controlled resistor (VCR) is a three-terminal active device with one input port and two output ports. The input-port voltage controls the value of the resistor between the output ports. VCRs are most often built with field-effect transistors (FETs). Two types of FETs are often used: the JFET and the MOSFET.

Info from Wikipedia :)

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The mass of the car is calculated as 1021.86 kg. We can calculate the mass of the car by using the formula: mass = Force / acceleration

Given information: Acceleration of the car = 1.83 m/s²

Force acting on the car = 1870 N

We know that Force = mass × acceleration

According to the question, we need to find the mass of the car. We can calculate the mass of the car by using the formula: mass = Force / acceleration

Putting the values in the above equation, we get mass = 1870 N / 1.83 m/s²

So, the mass of the car is: mass = 1021.86 kg

Therefore, the mass of the car is 1021.86 kg.

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An analog computer can be designed using operational amplifiers to simulate the second-order differential equation d2(vo)/dt2 + 2(dvo/dt) + vo = 10 sin(2t). The circuit would include two integrators, two summers, and a sinusoidal signal generator.

The first integrator would integrate the input sinusoidal signal to obtain the velocity signal, and the second integrator would integrate the velocity signal to obtain the position signal. The two summers would sum the input signal and the feedback signal to generate the error signal and sum the position signal and the damping signal to obtain the velocity signal. The output of the second integrator would be the simulated response of the second-order differential equation.

Analog computers were popular in the mid-twentieth century for solving differential equations, but they have largely been replaced by digital computers. Analog computers offer advantages in terms of speed, accuracy, and noise immunity, but they also have drawbacks in terms of complexity, maintenance, and flexibility.

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Explanation:

hopefully that makes sense. the position doesn't change over the 5 seconds, meaning it's stopped but time still continues. then when the slope is negative this shows the bear's position becoming negative (backing up, changing direction).