How many days during one year is the sun directly overhead at noon in new york city?.

A paper airplane is dropped from a balcony, then the friction from the air  slow down the airplane. As paper plane moves through the air, the air pushes against the airplane, hence slowing it down. This is called drag.

The force that slows the plane down as it pushes against the air it is moving through is called drag. It is a kind of friction and is also called as air resistance.

In fluid dynamics, drag is a force acting opposite to the relative motion of an object moving with respect to the surrounding fluid. Drag is non-existent, without motion.

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Answer:

B. economics

Explanation:

An understanding of economic principles can help a 911 operator understand the root causes of many different emergencies, such as poverty, drug abuse, and domestic violence, and help them be more effective at dispatching resources to help those in need. Furthermore, a basic understanding of economics can provide context for some types of emergencies, such as natural disasters or workplace accidents related to unsafe working conditions. However, while having an understanding of economics is helpful, it's not mandatory for 911 operators to perform their jobs effectively. They ultimately need to be skilled in communication, risk assessment, and decision-making to ensure that people receive the assistance and resources they need in an emergency situation.

The wavelength of the sinusoidal wave traveling along the rope is approximately 10.8 cm. To determine the wavelength, we utilize the formula wavelength = velocity / frequency.

To find the wavelength of the wave, we need to use the formula: wavelength = velocity / frequency. We are given the frequency (f) as 37.0 vibrations in 29.0 s. To find the velocity, we need to determine the distance traveled by the wave in a given time period. From the information provided, we know that a crest of the wave travels 400 cm in 12.0 s.

Frequency (f) = 37.0 vibrations / 29.0 s = 1.276 Hz

Velocity (v) = Distance / Time = 400 cm / 12.0 s = 33.33 cm/s

Wavelength (λ) = v / f = 33.33 cm/s / 1.276 Hz ≈ 26.11 cm

To find the wavelength, we first calculate the frequency using the given information that the oscillator completes 37.0 vibrations in 29.0 s. Dividing the number of vibrations by the time gives us the frequency of the wave, which is approximately 1.276 Hz.

Next, we calculate the velocity of the wave by dividing the distance traveled by the wave by the time it takes. The distance traveled by a given crest is 400 cm, and the time taken is 12.0 s. Dividing 400 cm by 12.0 s gives us a velocity of approximately 33.33 cm/s.

Finally, we can calculate the wavelength by dividing the velocity by the frequency. Dividing 33.33 cm/s by 1.276 Hz gives us a wavelength of approximately 10.8 cm.

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Answer: true

Plz mark brainliest:)

Answer:

7.5m/s²

Explanation:

Acceleration is the change in velocity of a body with respect to time.

acceleration = change in velocity/time

a = Δv/t

a = v-u/t

v is the final velocity = 15.0m.s

u is the initial velocity = 0.0m/s

t is the time = 2.0s

Substituting the values to get a

a - 15-0/2

a = 15/2

a = 7.5m/s²

Hence the acceleration of the baseball is 7.5m/s²

Answer:

\(\boxed {\boxed {\sf 2 \ m/s^2}}\)

Explanation:

Acceleration can be found by dividing the change in velocity by the time.

\(a=\frac{\Delta v}{t}\)

The time is 1.25 seconds.  The change in velocity is the difference between the initial velocity and the final velocity.

\(\Delta v= 2.5 \ m/s\\t=1.25 \ s\)

Substitute the values into the formula.

\(a=\frac{2.5 \ m/s}{1.25 \ s}\)

Divide.

\(a=2 \ m/s^2\)

The sprinter's average acceleration is 2 meters per second squared.

Answer: 2 m/s^2

Explanation: Hope this helps :)

Newton’s Second Law of Motion is defined as Force is equal to the rate of change of momentum. For a constant mass, force equals mass times acceleration.

\(\Delta p = mv - mu \\\\\implies \Delta p = m(v-u) \\\\F = \dfrac{\Delta p}{\Delta t} = \dfrac{m(v-u)}{\Delta t} = ma\)

F = ma is the formula of Newton’s Second Law of Motion.

To prove Newton's second law of motion,

Given Force F = Δp/Δt

Proof for F=ma

     Let us consider an object of mass m, moving along a straight line with an initial velocity u, final velocity v and it has some particular time t and thus Momentum can be related as,

For initial velocity u, p1 = m × u

The final velocity v, p2 = m × v

The change in momentum can be expressed as

p2 – p1 = (m × v) – (m × u)

p2 – p1 = m (v – u)

Here, we know that the rate of change of momentum with respect to time is proportional to the applied force.

The applied force F,

F ∝ [m (v – u)]/t

F ∝ m × a

As acceleration (a) is the rate of change of velocity with respect to time.

F = k × m × a

F = ma

where k can be the constant.

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Major faunal extinctions occurred several times in the geologic past. The boundaries between eras were drawn were mass extinctions events occurred. The earlier of these two extinctions occurred at the end of the Permian Period, 252 million years ago.5 fossil groups that bacame extinct at this time Trilobites,Foraminifera,Blastoids,Brachiopods,Fusulinids.

List of five fossil groups that became extinct at this time are as follows:

Trilobites: These were one of the most diverse and abundant arthropod groups with a long fossil record. Trilobites were one of the first fossil groups to appear in the Cambrian Period and they disappeared during the end-Permian extinction.

Foraminifera: These were a type of single-celled protozoa that form small shells. They were common in shallow water environments and were abundant in the Permian.

Blastoids: These were extinct, stemmed echinoderms which were abundant in the Mississippian Period. They declined during the Pennsylvanian and disappeared during the Permian.

Brachiopods: These are marine invertebrates which have a two-part shell. Brachiopods were abundant throughout the Paleozoic Era and many species became extinct during the Permian.

Fusulinids: These were a type of single-celled protozoa that formed large shells. They were abundant in the late Carboniferous and Permian and disappeared during the end-Permian extinction.

Thus, these were the five fossil groups that became extinct during the end of the Permian period.

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Answer:To calculate the required values, we can use the formula for density: density = mass/volume.

i) Volume of water that fills the density bottle = mass of water/density of water

Mass of water = Mass of density bottle filled with water - Mass of empty density bottle = 53.2g - 13.2g = 40g

Density of water = 1g/cm³ (at room temperature and pressure)

Volume of water = 40g/1g/cm³ = 40cm³

ii) Capacity of the density bottle = Volume of water + Volume of lead shots

Volume of water = 40cm³ (calculated above)

Volume of lead shots = Volume of density bottle filled up with lead shots and water - Volume of water

Volume of density bottle filled up with lead shots and water = Mass of density bottle with lead shots filled up with water - Mass of empty density bottle

= 166.1g - 13.2g = 152.9g

Volume of lead shots and water = Volume of density bottle filled up with lead shots and water - Volume of water

Volume of lead shots and water = 152.9cm³ - 40cm³ = 112.9cm³

Assuming that the volume of water in the partially filled density bottle is negligible, we can take the volume of lead shots to be equal to the volume of the partially filled density bottle.

Capacity of the density bottle = Volume of water + Volume of lead shots = 40cm³ + 112.9cm³ = 152.9cm³

iii) Mass of lead shots = Mass of density bottle with lead shots filled up with water - Mass of density bottle filled with water

= 166.1g - 53.2g = 112.9g

iv) Volume of lead shots = Mass of lead shots/density of lead

Density of lead = 11.34 g/cm³ (at room temperature and pressure)

Volume of lead shots = 112.9g/11.34 g/cm³ = 9.96 cm³ (approximately)

v) Density of lead = Mass of lead shots/Volume of lead shots

Density of lead = 112.9g/9.96cm³ = 11.32 g/cm³ (approximately)

Therefore, the required values are:

iii) Mass of lead shots = 112.9g

iv) Volume of lead shots = 9.96cm³ (approximately)

v) Density of lead = 11.32 g/cm³ (approximately)

Explanation:

A 1,100 kg car is going at 22 m/s. Force is needed to stop it in 20

seconds is 1210 N.

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

Using equation of motion,

v = u +  at

0 = 22 + a.20

a = 1.1 m/sec²

force = mass.acceleration

force = 1100.(1.1)

force = 1210 N.

A 1,100 kg car is going at 22 m/s. Force is needed to stop it in 20

seconds is 1210 N.

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The evidences that the Earth is a sphere not flat.

The Earth we know, is a sphere that rotates on its axis for about 24 hours. It also revolves around the Sun for about 365 days. Like other celestial bodies, researchers say that the Earth is round, a sphere.

There are many evidences that the Earth is a sphere. Some of them are as explained above.

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Answer:

1323

Explanation:

we know ,

weight = m*g

= 135 * 9.8 ( acceleration due to gravity in earth is 9.8 m/S2)

= 1323 N

The quantity with the same units as force times time (ft) and dimensions of MLT^(-1) is momentum.

Momentum is defined as the product of an object's mass and its velocity. Its units in the SI system are kilogram meters per second (kg m/s).

To see why momentum has the same units as force times time, we can use the definition of force, which is the rate of change of momentum.

F = dp/dt

where F is force, p is momentum, and t is time. Rearranging this equation, we get:

F * t = dp

where F * t is force times time (ft) and dp is the change in momentum. Therefore, force times time has the same units as momentum, which is MLT^(-1).

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The plane travels a distance of 325 miles if the airplane travels for 2.5 hours at an average speed of 130 miles per hour. Using the distance formula (d = rt), we can calculate the distance.

To find the distance traveled by the airplane, we can use the distance formula, which is represented as d = rt. In this formula, "d" represents the distance, "r" represents the rate or speed at which the object is traveling, and "t" represents the time taken for the travel.

Given that the airplane travels for 2.5 hours at an average rate of 130 miles per hour, we can substitute these values into the formula. The rate of the airplane is 130 miles per hour, and the time taken is 2.5 hours.

Using the formula, we can calculate the distance traveled as follows:

d = rt

d = 130 mph × 2.5 hours

Multiplying the rate (130 mph) by the time (2.5 hours) gives us:

d = 325 miles

Therefore, the airplane travels a distance of 325 miles during the 2.5 hours of travel at an average rate of 130 miles per hour.

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Answer:

6

Explanation:

The correct statement for the potential difference (V1−V2) between the electric potentials at points 1 and 2 on the surface of the sphere is D. ΔV=kqR, because both points are the same distance from the center of the sphere.

The potential difference between two points is given by the formula ΔV = kq/r, where k is the electrostatic constant, q is the charge, and r is the distance between the points.

In this case, points 1 and 2 are on the surface of the sphere, and they are equidistant from the center of the sphere.

Since the distance from the center of the sphere is the same for both points, the potential difference between them will be the same.

Therefore, the correct option is D, stating that the potential difference ΔV between points 1 and 2 is given by ΔV = kqR

Where R is the radius of the conducting sphere and q is the charge of the point charge placed near the sphere. This is because the points are equidistant from the center of the sphere.

Option A is incorrect because the surface of the sphere being an equipotential surface does not imply that the potential difference between two points on the surface is zero.

Option B is incorrect because although the points are the same distance from the center of the sphere, it does not guarantee that the potential difference between them is zero.

Option C and Option E are incorrect because they do not consider the equidistance of the points from the center of the sphere, which is the determining factor for the potential difference in this scenario.

Therefore, the correct answer is D.

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Answer:

Stars are huge celestial bodies made mostly of hydrogen and helium that produce light and heat from the churning nuclear forges inside their cores. Aside from our sun, the dots of light we see in the sky are all light-years from Earth.

Explanation:

Stars are the most widely recognized astronomical objects, and represent the most fundamental building blocks of galaxies. The age, distribution, and composition of the stars in a galaxy trace the history, dynamics, and evolution of that galaxy. Moreover, stars are responsible for the manufacture and distribution of heavy elements such as carbon, nitrogen, and oxygen, and their characteristics are intimately tied to the characteristics of the planetary systems that may coalesce about them. Consequently, the study of the birth, life, and death of stars is central to the field of astronomy.

Stars are born within the clouds of dust and scattered throughout most galaxies. A familiar example of such as a dust cloud is the Orion Nebula. Turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction. As the cloud collapses, the material at the center begins to heat up. Known as a protostar, it is this hot core at the heart of the collapsing cloud that will one day become a star. Three-dimensional computer models of star formation predict that the spinning clouds of collapsing gas and dust may break up into two or three blobs; this would explain why the majority the stars in the Milky Way are paired or in groups of multiple stars.

Answer:

stars are are giant balls of gases...yes their light is natural, it emits light due to chemical activities in the cor of star. We are living in the milky way and the nearest galaxy to us is Andromeda galaxy which is about 2.5x more larger than our galaxy, no there are no proofs for presence of aliens

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The overall change in internal energy between the initial and final states per unit mass of water needs to be determined.

The initial state of the water is given as 400 kPa and 300°C. Since the pressure remains constant during the first step, the process on the T-v diagram would be a vertical line parallel to the constant pressure line. This line represents the cooling process at constant pressure until the water exists as a saturated vapor, and the piston rests on the stops.

In the second step, the water continues to cool until the pressure reaches 150 kPa. The process on the T-v diagram would be a horizontal line parallel to the constant temperature line. This line represents the cooling process at constant temperature until the desired final pressure is reached.

To find the overall change in internal energy per unit mass of water, we need to consider the difference in internal energy between the initial and final states. This can be calculated using the specific heat capacity of water at constant pressure, which is approximately constant over the given temperature range.

The change in internal energy can be obtained by multiplying the specific heat capacity at constant pressure by the change in temperature. In summary, the cooling process of water from 400 kPa and 300°C to 150 kPa involves two steps: cooling at constant pressure until saturation, followed by cooling at constant temperature. The process curves on the T-v diagram would be vertical and horizontal lines.

The overall change in internal energy per unit mass of water can be determined by multiplying the specific heat capacity at constant pressure by the temperature difference between the initial and final states.

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Without knowing all the external forces and assuming e = 1, we cannot accurately determine the final velocities for an elastic collision.

To show that p1 + p2 = p'1 + p'2 and E = E', we can use the conservation equations for momentum and energy.

For momentum conservation:

p1 + p2 = p'1 + p'2

(m1v1 + m2v2) = (m1v'1 + m2v'2)

For energy conservation:

E = E'

(1/2)m1v1^2 + (1/2)m2v2^2 = (1/2)m1v'1^2 + (1/2)m2v'2^2

In an elastic collision, e = 1, which means that the kinetic energy is conserved. However, in this case, we cannot assume that e = 1. Therefore, the collision is not necessarily elastic and the final velocities may not be accurate.

Additionally, we also need to consider any external forces that may be acting on the system, as they can also affect the final velocities. Without knowing all the external forces and assuming e = 1, we cannot accurately determine the final velocities for an elastic collision.

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The type of electromagnetic radiation is Radiowaves which have a wavelength of 10 meters.

Since these waves have a longer wavelength, they are used for communication over long distances. Some examples of sources that emit these radiations - radiowaves - are TV and radio stations, cell phone towers, as well as satellites.

Radio waves are very beneficial as they can travel long distances without any power losses and getting absorbed or scattered by the atmosphere. Also, radio waves are non-ionizing and generally considered safe for human exposure. They are widely used in many applications, including broadcasting, navigation, remote sensing, and medical imaging.

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2.71 μF is the capacitance of the second capacitor.

What is voltage in simple terms?

Given

Frequency of AC generator   f = 440 Hz

Voltage a across capacitor  Vc  = 24 V

       Voltage across capacitor is

                  Vc     =  I  / 2 πf C 1    

                           I  =  ( 2 πf C 1 ) Vc  ........ ( 1)  

A second capacitor is conected in parallel combination with the forst capacitor . Voltage across each capacitor is same.

   Equivalent capacitance is   C1 + C 2  

       Voltage across capacitor is

                  Vc    = (  I  + 0.18 A ) / 2 πf ( C 1 + C2   )

                (  I  + 0.18 A )  =   2 πf ( C 1 + C2   ) * Vc    

                     ( 2 πf C 1 ) Vc  +  0.18   =    ( 2 πf C 1 ) Vc  +  ( 2 πf C 2 ) Vc    

                      ( 2 πf C 2 ) VC    = 0.18      

Capacitance of second capacitor is

                                C 2  =   0.18 A  / 2πf V C    

                                       = 0.18 / 2π ( 440 ) ( 24 )

                                        =   2.71*10-6 F    

                                                                 or

                                        =  ( 2.71*10-6 F    )( 1 μF   / 10-6 F  )

                                        = 2.71 μF

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A rectangular water tank is 14.5 cm long and 4.63 cm wide. if 368.5 g of water completely fills the tank, the height of the tank is 5.49 cm. (assume the density of water is 1.000 g/ml.)

Definition of Density: Density is the measurement of how closely a material is packed. The definition of it is the mass per unit volume. D or, the symbol for density calculating density The formula for density is given by = m/V, where m is the object's mass and V is its volume.

mass per unit volume of a solid substance; density. Density is defined as d = M/V, where M stands for mass, and V for volume. Grams per cubic centimeter are the most common units used to express density.

The amount of "stuff" in a certain amount of space is measured by its density. For instance, a block of gold will be denser than a chunk of the softer, lighter element lead (Pb), which is a heavier element (Au)

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Answer:

3^15 / 3^3 = 3^12 * 3^3 / 3^3 = 3^12

The Law of Exponents applies here

3^15 x 3^3 is a product, not a quotient

3^15 x 3^3 = 3^18

The time period of a simple pendulum is

\(t = \ 2\pi\sqrt{ \frac{l}{g}}\)

Therefore, time period is directly proportional to length of the string ( t ∝ l ).

From the formula:

\(t = \ 2\pi\sqrt{ \frac{l}{g}}\)

Where,

We can see: for simple pendulum time period is directly proportional to length of the string ( t ∝ l ). And inversely proportional to acceleration due to gravity ( t ∝ 1/g) . If length(l) of the string is increased, then time period (t) of the pendulum will also increase.

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Since F₁ is directed towards the south and F₂ is directed towards the east, we can use the Pythagorean theorem to find the magnitude of the net force:

 F = √(F₁² + F₂²)

The magnitude of the net electrostatic force on the test charge in newtons is given by the formula: F= k(q1q2)/r²

where k is Coulomb's constant, q1 is the charge on particle a, q2 is the charge on particle b, and r is the distance between the test charge and the other two charges.

Using the given values, we can find the magnitude of the net electrostatic force on the test charge as follows: F₁

= k(2e)(-2e)/(0.0200m)²F₂

= k(2e)(3e)/(0.0200m)²

The net force is obtained by taking the vector sum of F₁ and F₂.

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it is not possible to determine the exact distance that an object will travel under the influence of kinetic friction and an initial velocity of 3.5 m/s

The equation for frictional force is given by:

                                      f_k = μ_k * N

where μ_k is the coefficient of kinetic friction and N is the normal force.

The normal force is equal to the gravitational force experienced by the object, which is given by:

                                       N = m * g

where m is the mass of the object and

g is the acceleration due to gravity (9.8 m/s^2).

The net force on the object is given by the difference between the gravitational force and the frictional force:

                                        f_net = m * a

where a is the acceleration of the object.

The acceleration can be related to the initial velocity, v_i, and the final velocity, v_f, using the equation:

                                     a = (v_f - v_i) / t

where t is the time elapsed.

The final velocity can be assumed to be zero, since the object will eventually come to rest due to the frictional force.

.

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