A ball with a mass of 2.00 kg is dropped from a height of 10.0 m. 2kg 10 m How long will it take to hit the ground?​

Water flowing through a horizontal pipe the speed of the water increases. The correct answer is (e)

Fluid mechanics is the study of how fluids behave under various circumstances. The flow of fluids and the forces that they generate or experience are investigated in this discipline. The three essential states of matter, namely gas, liquid, and solid, are covered in fluid mechanics.The properties of a fluid are viscosity, density, and pressure. They also have an impact on how fluids interact with objects. The following are the main components of fluid mechanics:

Fluid Statics: This branch of fluid mechanics studies fluids at rest.

Fluid Kinematics: This field of fluid mechanics focuses on the properties of the fluid motion.

Fluid Dynamics: This field of fluid mechanics studies the forces produced by fluids in motion.
When water flows from a section with a large diameter to a section with a small diameter in a horizontal pipe, the continuity equation comes into play. The equation states that the product of the cross-sectional area (A) and the flow speed (v) must remain constant:
A1 * v1 = A2 * v2
Since the cross-sectional area (A) decreases when going from the large diameter section to the small diameter section, the flow speed (v) must increase to keep the product constant. Therefore, the speed of the water increases.

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Gravitational potential energy is a form of energy that depends on changes in the height of an object. The higher an object is, it will have more gravitational potential energy. If a body with mass m is elevated a distance h, the change in gravitational potential energy of that object is:

Where g is the gravitational acceleration:

Kinetic energy is a form of energy that depends on the speed of an object. The faster an object moves, more kinetic energy it will have. If an object with mass m moves at speed v, its kinetic energy K is given by the expression:

Answer:

Elements heavier than iron are formed by neutron capture processes during stellar death and supernovae.

Explanation:

Most of the elements heavier than iron are formed during the death of stars through neutron capture processes, specifically the R-Process and the S-Process. The R-Process is a rapid capture of neutrons, while the S-Process is a slow capture of neutrons. These processes either directly form elements or indirectly form them through decay processes [^1]. Elements heavier than iron are primarily made in environments with free-neutron densities in excess of a million particles per cubic centimeter [^2]. In the extreme energetic conditions of supernovae, atoms are bombarded by a very large number of neutrons, and rapid successive neutron capture, followed by beta decay, produces the heavier atoms [^5].

So, elements heavier than iron are formed by neutron capture processes during stellar death and supernovae.

[^1

Answer: 4800 N/m

Explanation:

Given

mass of rock \(m=2.5\ kg\)

Height of cliff \(h=32\ m\)

compression in the spring \(x=57\ cm\)

Here, potential energy is converted into kinetic energy which in turn converts to elastic potential energy of the spring

\(\Rightarrow mgh=\dfrac{1}{2}kx^2\\\\\Rightarrow k=\dfrac{2mgh}{x^2}\\\\\Rightarrow k=\dfrac{1568}{0.3249}\\\\\Rightarrow k=4826.100\approx 4800\ N/m\)

Answer:

480

Explanation:

2021

The ratio of the rise/run has to be the same in order to have a constant slope (option C).

Slope, in mathematics, is the ratio of the vertical and horizontal changes between two points on a surface or a line.

The slope is zero if the line is horizontal and undefined if it is vertical.

The vertical change between two points is called the rise while the horizontal change is called the run. This means that the slope equals the rise divided by the run.

Therefore, this suggests that the ratio of the rise/run has to be the same in order to have a constant slope.

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Answer:

the answer to this question is the first one. i'm sorry I can not say it because it delete my answer

Explanation:

Answer: Distance traveled in time t is s

Explanation: Self Explanatory

Vehicles need to be serviced for several reasons such as preventing costly repairs and improving fuel economy.

First, regular maintenance can help to prevent costly repairs down the road. Second, maintenance can help to improve fuel economy and emissions. Third, maintenance can help to keep your vehicle safe and reliable.

The servicing requirements for petrol/diesel and electric vehicles differ in a number of ways. Petrol/diesel vehicles require oil changes more frequently than electric vehicles. This is because petrol/diesel engines use oil to lubricate the moving parts, while electric motors do not. Petrol/diesel vehicles also require tune-ups more frequently than electric vehicles.

This is because petrol/diesel engines have more moving parts that need to be synchronized, while electric motors have fewer moving parts.

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Answer:The correct answer is mass

Using Newton's second law and kinematics we find that the correct answer are:

Kinematics studies the motion of bodies, establishing relationships between the position, velocity and acceleration of bodies.

               v = v₀ + a t

                y = v₀ t + ½ a t²

Where v i de veloicity, a the acceleration,y the position and t the time

Newton's second law states that force is proportional to the mass and acceleration of bodies

               F = ma

Where F es the force, m the mass ( scalr) and a de acceleraction

In the experiment shown, the car starts with zero initial velocity from a zero initial position, as the hanging mass creates a force that pulls the car, it increases its position and speed as time stops.

Therefore the position and speed are changing with time.

As the hanging mass is constant the applied force is constant consequently due to Newton's second law the mass of the body and its acceleration must be constant

In summary the acceleration, the mass and the applied force are constant.

The variable magnitude with time is the speed

In conclusion using Newton's second law and kinematics we find that the correct answer is

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Answer:

In light waves, the electromagnetic fields oscillate perpendicular to the direction of propagation. Hence, sound waves are longitudinal waves whereas light waves are transverse waves.

We are asked to determine the length of a ship whose length is 15 meters. To determine the relative length we will use the following formula:

Where:

Now, we substitute the value of the speed as a function of the speed of light:

Substituting we get:

Now, we distribute the exponent and simplify:

Solving the operations:

Therefore, the length of the spaceship observed by the friend is 14.14 meters.

The 155 and 40.0 m/s jet speed and wind peed, as well as the due North and North East direction of the jet and wind gives;

a) The airspeed of the jet is approximately 185.45 m/s

b) The pilot must point the jet is at approximately 98.77° measured from the positive direction of the x-axis

The speed is given by the vector sum of the wind speed and the ground speed

a) The speed of the jet relative to the ground = 155 m/s

Direction of the jet = Due North

Wind speed = 40.0 m/s

Wind direction = 45.0° North of East

Required; The airspeed, the speed of the jet relative to the air

Solution;

The velocity of the jet as a vector is presented as follows;

v(jet) = 155•j

The wind velocity, v(wind) = 40×cos(45°)•i + 40×sin(45°)•j

The airspeed is therefore;

v = 40×cos(45°)•i + (155+40×sin(45°))•j

Which gives;

v = 28.28•i + 183.28•j

b) The resultant direction of the jet is given by the ratio of the coefficients of i and j in the vector form of the resultant velocity as follows;

\( \theta) = arctan \left(\frac{183.28}{28.28} \right) \approx 81.23^{\circ}\)

The direction the pilot of the jet should point the plane is therefore;

90 - 81.23 ≈ 8.77

Given that the jet is tilted due West by approximately 8.77°, the pilot should tilt the plane at approximately 8.77° East of North, which is at an angle of 98.77°, measure from the positive direction of the x-axis

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Answer:

Force can be defined as the product of mass and acceleration.

Explanation:

~Cornasha_Weeb

Answer:

L = 130 decibels

Explanation:

The computation of the sound intensity level in decibels is shown below:

According to the question, data provided is as follows

I = sound intensity = 10 W/m^2

I0 = reference level = \(1 \times 10-12 W/m^2\)

Now

Intensity level ( or Loudness)is

\(L = log10 \frac{I}{10}\)

\(L = log10 \frac{10}{1\times 10^{-12}}\)

\(L = log10 \times 1013\)

\(= 13 \times 1 ( log10(10) = 1)\)

Therefore  

L = 13 bel

And as we know that

1 bel = 10 decibels

So,

The  Sound intensity level is

L = 130 decibels

Answer:

I. a, c, f and h

II. e

III. b, d, g and i

IV. i

Explanation:

I. Chemical symbols are simple abbreviations used to represent various elements or compound. They consist entire of alphabet.

For the diagram given above, the labelled parts which represent chemical symbol are: a, c, f and h

II. Coefficients are numbers written before the chemical symbol of elements or compound.

For the diagram given above, the labelled part which represent Coefficient is: e

III. Number of atoms of element present in a compound is simply obtained by taking note of the numbers written as subscript in the chemical formula of the compound.

For the diagram given above, the labelled part which represent the number of atoms of the element are: b, d, g and i

IV. When no number is written as subscript in the formula of the element in the compound, it means the element has just 1 atom in the compound.

For the diagram given above, the labelled part which indicates that only 1 atom of the element is present is: i

Answer:

i. a, c, f, h

ii. e

iii. b, d, g, i

iv. i

Answer:

a. 14000

Explanation:

Given parameters:

Efficiency of the machine  = 70%

Work done on machine  = 20000J

Unknown:

Work done by machine = ?

Solution:

 Efficiency of a machine is determined by;

  Efficiency  = \(\frac{Work done by machine}{Work done on machine} x 100\)  

   70  = \(\frac{Work done by machine}{20000}\) x 100

   70  = \(\frac{work done by machine}{200}\)  

 Work done by machine  = 70 x 200 = 14000J

Even without wind the sun help evaporate the water so it would dry faster. The other towel is in a bag so the moist and water has nowhere to go, therefor staying in the towel.

Based on Hooke's law, the spring constant of the the body's muscle mechanism is the ratio of force to extension, the effective mass is m/3 and the potential energy that can be stored is ke^2 / 2.

The spring constant or stiffness constant of an elastic spring is constant which describes the extent a bit forceapplied to an elastic spring will extend it.

Assuming, a body's muscle mechanism is a spring obeying Hooke's law, the effective mass of the spring with mass m is 1/3 of the mass of the spring = m/3

The potential energy that can be stored = ke^2 / 2

where K is spring constant and e is the extension produced.

Therefore, the spring constant of the the body's muscle mechanism is the ratio of force to extension, the effective mass is m/3 and the potential energy that can be stored is ke^2 / 2.

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We have that the time in seconds, minutes, and hours is

\(t=1.083*10^{-4}s\)

\(T_{min}=1.805*10^{-6}min\)

\(T_{hours}=3.0083*10^{-8}hours\)

From the Question we are told that

Velocity \(v=13.0m/s\)

Distance \(d=120 km\)

Generally the equation for the Time  is mathematically given as

\(t=\frac{13}{120*10^3}\\\\t=1.083*10^{-4}s\)

Therefore

\(T_{min}=1.083*10^{-4}s/60\)

\(T_{min}=1.805*10^{-6}min\)

And

\(T_{hours}=T_{min}/60\)

\(T_{hours}=3.0083*10^{-8}hours\)

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Answer:

Hurricanes move fast so what you want to do is get into a basement or somthing underground so it will be harder for the hurricane to hit you

Explanation:

thanks for the coins

Direct axis and quadrature axis components of armature current are 30.28 A and 46.92 A respectively, and the excitation voltage of the generator is 765.36 V.

Given:

Apparent power (S) = 10 KVA = 10,000 VA

Line voltage (V) = 380 V

Frequency (f) = 50 Hz

Xd = 12 ohms

Xq = 8 ohms

Ra = 1 ohm

Power factor (pf) = 0.8 lagging

Load angle (δ) = 16.15 degrees

(i) Armature current's direct axis and quadrature axis components

We know that the apparent power is given by S = 3VLILcos(φ), where VL is the line voltage, IL is the line current, and φ is the angle between them. For a star-connected alternator, line voltage is equal to phase voltage, so we can write:

S = 3Vphase Iphase cos(φ)

Iphase = S / (3Vphase cos(φ))

For a lagging power factor, cos(φ) = 0.8, so

Iphase = 10,000 / (3 x 380 x 0.8) = 10.46 A

The direct axis component (Id) and the quadrature axis component (Iq) make up the armature current.  Using the given values of Xd, Xq, and Ra, we can calculate these components as follows:

Id = (VL - IaRa) / Xd

Iq = (VL - IaRa) / Xq

where Ia is the magnitude of the armature current, which is equal to the magnitude of the line current divided by √3. Thus,

Ia = Iphase / √3 = 10.46 / √3 = 6.03 A

Substituting the given values:

Id = (380 - 6.03 x 1) / 12 = 30.28 A

Iq = (380 - 6.03 x 1) / 8 = 46.92 A

(ii) Excitation voltage of the generator:

The excitation voltage (E) of the generator is given by:

E = Vphase + IqXq

Substituting the given values:

E = 380 + 46.92 x 8 = 765.36 V

Therefore, the direct axis and quadrature axis components of armature current are 30.28 A and 46.92 A respectively, and the excitation voltage of the generator is 765.36 V.

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1) Since each bulb has a resistance of 3.00 Ω, we can calculate the number of bulbs: n = R/R_bulb = 96 Ω/3.00 Ω = 32 bulbs. There are 32 light bulbs in the circuit.

2) The total resistance is equal to the sum of individual resistances: R_C = 120 Ω - 6 Ω - 18 Ω = 96 Ω. The resistance of bulb C is 96 Ω.

In a series circuit, the total resistance is equal to the sum of individual resistances. Using Ohm's Law, we can find the total resistance:

R = V/I = 120.0 V/1.25 A = 96 Ω

Since each bulb has a resistance of 3.00 Ω, we can calculate the number of bulbs:

n = R/R_bulb = 96 Ω/3.00 Ω = 32 bulbs

Therefore, there are 32 light bulbs in the circuit.

In a series circuit, the total resistance is equal to the sum of individual resistances:

R_eq = R_A + R_B + R_C

Substituting the given values:

120 Ω = 6 Ω + 18 Ω + R_C

Solving for R_C:

R_C = 120 Ω - 6 Ω - 18 Ω = 96 Ω

Therefore, the resistance of bulb C is 96 Ω.

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Answer;

Amount of time the two substances are in contact

Area in contact between the two substances

Specific heat of the material that makes up the substances

Explanation;

The change in temperature of a substance is caused by heat energy. The change in temperature will depend on factors such as mass of the substance, the type of material it is made from, the time taken , specific heat of the material that makes the substance, and also the area of contact.

The amount of time the two substances are in contact affect the change in temperature such that if the two bodies are in contact for a longer time then a bigger change in temperature will be observed.

Specific heat capacity also determines the change in temperature that will be observed, such that a substance with a bigger specific heat capacity will record a small change in temperature.

(a) The work done by the force on the block is 9.99 J.

(b) The work done by gravity on the block is 29.4 J.

(c) The magnitude of the normal force between the block and the wall is 9.8 N.

The work done by the applied force on the block is calculated as follows;

W = Fd cosθ

where;

F - μmg = ma

since the block is moving as constant velocity, acceleration = 0

Fcosθ - μmg = 0

F = μmg/cosθ

W = μmgd/cosθ

W = 0.3 x 1 x 9.8 x 3 / cos(28)

W = 9.99 (J)

The work done by gravity on the block is calculated as follows;

W = mg d cosθ

where;

W = 1 x 9.8 x 3 x cos(0)

W = 29.4 J

The magnitude of the normal force between the block and the wall is calculated as;

Fn = mg

Fn = 1 x 9.8

Fn = 9.8 N

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In general, a reaction is sped up by increasing temperature and slowed down by decreasing temperature. But extremely high temperatures can denature an enzyme, causing it to lose its form and cease functioning.

As enzymes have a maximum temperature and pH at which their rate is maximal, temperature and pH can both raise or reduce the enzyme reaction rate. The pace of reaction for the enzyme will be slowed down by changes in temperature and pH that are not optimal.

An enzyme's concentration increases along with the speed of an enzyme-catalyzed process. An enzyme-catalyzed process accelerates with rising temperatures at low temperatures. The protein is denatured at higher temperatures, which also causes a sharp drop in reaction rate.

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A response is typically sped up by rising temperature and slowed down by falling temperature. However, exceedingly hot temperatures can denature an enzyme, causing it to lose its shape and stop working.

Temperature and pH have the ability to increase and decrease the rate of an enzyme reaction since enzymes have a maximum temperature and pH at which they function at their highest rate. Unfavorable variations in temperature and pH will cause the enzyme's reaction to proceed more slowly. The rate of an enzyme-catalyzed process increases as the concentration of the enzyme rises. When temperatures are low, an enzyme-catalyzed reaction speeds up as they rise. At higher temperatures, the protein is denatured, which also results in a dramatic decrease in response rate.

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The most likely true statement about asynchronous communication is that it is helpful when employees work across multiple time zones.

Asynchronous communication refers to a mode of communication where participants do not need to be present or engaged simultaneously. Instead, they can send and receive messages at their convenience.In today's globalized society, businesses often have teams distributed across different geographical locations and time zones. Asynchronous communication becomes invaluable in such scenarios as it allows team members to collaborate effectively without the constraints of real-time interactions. By utilizing tools like email, project management platforms, or messaging apps, individuals can communicate and exchange information regardless of their location or the time differences.

Asynchronous communication also offers benefits such as flexibility and increased productivity. Team members have the freedom to work at their own pace and prioritize tasks accordingly. It provides opportunities for thoughtful and well-crafted responses, as individuals can take time to gather information or reflect on complex matters before replying.While asynchronous communication is advantageous for teams operating across multiple time zones, it does not rely on all employees working in the same time zone. In fact, it is designed to accommodate diverse schedules and allow individuals to collaborate efficiently despite their varying work hours.

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The centripetal acceleration:

The mass of the Earth:

The Force needed for the earth to stay in the orbit is given as:

F = ma

Therefore, the force (F) needed for the earth to stay in the orbit is: