If the swimmer could cross the English Channel (32km) maintaining the same
velocity as for the first 50 m in the pool, how long would it take? (Actual times
are around 15 hours.) Answer: 4.3h.

The power to stop the car with kinetic energy of a car is  \(8*10^{6} J\) as it travels along a horizontal road is  \(8*10^{5} watt\), option B

Kinetic energy can be seen as one that is been recorded when an object is able to move from a place , in a broad term we can say this is the energy that can be attributed to that of someone leaving a place and go to another place hence we can see it as the one in the motion.

The definition of energy as the "power to accomplish work" refers to the capacity to apply a force that moves an object. Even if the word is vague, it is clear what energy actually means: it is the force that causes objects to move. The two types  can be attributed to the one we know which are kinetic and potential energy.

\(Power \frac{Energy}{time}\)

\(Energy = 8*10^{6} J\)

\(time = 10 s\)

\(Power = \frac{8*10^{6} J}{10}\)

\(power = 8*10^{5} watt\)

Learn more about  kinetic energy  at:

https://brainly.com/question/8101588

#SPJ1

proper question;

The kinetic energy of a car is 8 × 106 J as it travels along a horizontal road. How much power is required to stop the car in 10 s? (A) zero joules (B) 8  105 J (C) 8  107 J (D)8  104 J (E) 8  106 J​

Answer:

16.53 m

Explanation:

The following data were obtained from the question:

Initial velocity (u) = 18.0 m/s.

Final velocity (v) = 0 m/s

Acceleration due to gravity (g) = 9.8 m/s²

Maximum height (h) =.?

The maximum height reached by the ball can be obtained as follow:

v² = u² – 2gh (since the ball is going against gravity)

0² = 18² – (2 × 9.8 × h)

0 = 324 – 19.6h

Rearrange

19.6h = 324

Divide both side by 19.6

h = 324 / 19.6

h = 16.53 m

Therefore, the maximum height reached by the ball is 16.53 m

Answer:

Mass.

Explanation:

I took the quiz and got the answer right

- The resistance of the first resistor (R₁) is 12 Ω.

- The electromotive force (EMF) of the battery is 18 V.

- The internal resistance of the battery is 12 Ω.

To solve the given problem, we can apply Kirchhoff's laws and Ohm's law to determine the resistance of the first resistor (R₁) and the electromotive force (EMF) and internal resistance of the battery.

Let's start by calculating the resistance of the first resistor (R₁):

1. Apply Ohm's law to find the voltage drop across the external circuit:

  V = I * R

  V = 1 A * 6 Ω

  V = 6 V

2. The voltage drop across the external circuit is equal to the EMF minus the voltage drop across the internal resistance of the battery:

  V = E - Ir

  6 V = E - (1 A * r)   (where r is the internal resistance of the battery)

3. We also know that the EMF of the battery is the sum of the voltage drops across each cell in the battery:

  E = 6 cells * 3 V/cell

  E = 18 V

4. Substitute the value of E in the equation from step 2:

  6 V = 18 V - r

  r = 12 Ω

Therefore, the resistance of the first resistor (R₁) is 12 Ω.

For more such information on: resistance

https://brainly.com/question/28135236

#SPJ8

Of the options listed, the only effect that can be caused by exposure to infrared light is overheating (option a).

Infrared light is a form of electromagnetic radiation that is invisible to the human eye but can be detected as heat. When exposed to high levels of infrared light, such as in close proximity to a powerful infrared source, it can lead to overheating of the body or objects. Skin cancer (option b) is not directly caused by infrared light. It is primarily associated with overexposure to ultraviolet (UV) radiation from the sun or artificial sources like tanning beds. UV radiation falls in the higher energy range of the electromagnetic spectrum, while infrared radiation has lower energy. Radiation sickness (option c) is caused by exposure to high-energy ionizing radiation, such as gamma rays or X-rays. Infrared light does not possess enough energy to cause ionization and is therefore not capable of inducing radiation sickness. Memory loss (option d) is not a known effect of exposure to infrared light. Memory loss can be attributed to various factors, such as neurological conditions, head injuries, or aging, but not specifically to infrared light exposure. In summary, while exposure to high levels of infrared light can lead to overheating, it does not cause skin cancer, radiation sickness, or memory loss.

for more questions on infrared

https://brainly.com/question/29493769

#SPJ11

Answer:

Initial height

Answer:

A: the hardness of the sidewalk where the mug landed

Explanation:

did the quick check

Answer:

C) Increasing the mass and decreasing the distance

Explanation:

Since the equation for gravitational force is Fg = (Gm₁m₂)/r² where m₁ and m₂ are the masses of the objects and r is the distance between them, increasing the masses and decreasing the distance will produce a larger Fg.

Hope this helps. I'm not great at explaining. I'm new to Brainly

Thanks

Answer:

Earth analogue

I am trying to answer it in a simple way.

The Big Bang theory attempts to explain to us about the origin of the universe. It talks of a singular huge explosion unimaginable in physical terms.The universe expanded and hence the temperature came down. Later galaxies were formed which makes the present day universe

In the solar system of the milky way galaxy earth was supposed to have been formed about 4.5 years back.Life appeared 500 million years after the formation of earth.

Now the primitive earth (at the very early stages of its formation) looked like this

So, how it becomes life sustaining planets from primitive condition.The credit goes to Sun, the ultimate source of energy

And later evolution happened (after the formation of life of course)

The earthians

After reading the above lines you can say that Sun helps a lot in the formation of earth and thus in the formation of life.

How many stars are there in the universe?( infinite)

How many galaxies exists in the universe?(infinite)

How many planets like earth would be there in the universe? (Of course infinite)

So the only anomaly remains here is that humans have not yet succeeded in discovering a planet like earth. ( That doesn't mean there is no planet like earth)

These are some of the planets like earth as discovered by NASA in 2015.From left these are Kepler-22b, Kepler-69c, Kepler-452b,Kepler-62f, Kepler-186f (Wow amazing names!) and earth.

There are numerous planets like earth in the entire universe. So lets keep searching for such planets.

Thanks.

Answer:

All other SI units are derived by multiplying, dividing or powering the base units in various combinations, For example: mechanical work is force applied multiplied by distance moved and has the unit newton metre written as Nm.

Explanation:

please mark me as the brainliest

Explanation:

The first step is to write the 1st condition of equilibrium, which states that the net force acting on the beam is zero:

\(F_{net} = 5\:\text{kN} + N_L + N_R - 40\:\text{kN} - 60\:\text{kN} = 0\)

where \(N_L\) and \(N_R\) are reaction forces at the beam supports on the left and right, respectively.

Next, the 2nd condition of equilibrium states that the net torque about a pivot point is zero. Let's choose the location of the left beam support as our pivot point, which will make the torque due to \(N_L\) is equal to zero. Let us also assume that the counterclockwise direction produces positive torque. So we can write

\(\tau_{net} = (40\:\text{kN})(2\:\text{m}) + (5\:\text{kN})(5\:\text{m}) \\+ N_R(7\:\text{m}) - (60\:\text{kN})(8\:\text{m}) = 0\)

\(\Rightarrow 80\:\text{kN-m} + 25\:\text{kN-m} + N_R(7\:\text{m}) \\= 480\:\text{kN-m}\)

Solving for \(N_R,\) we see that

\(N_R = 53.6\:\text{kN}\)

Putting this value into our 1st equation, we find that the reaction force \(N_L\) is

\(N_L = 100\:\text{kN} - 5\:\text{kN} - N_R\)

\(\:\:\:\:\:\:\:\:= 41.4\:\text{kN}\)

Answer:

it represents the physical changes.

Explanation:

I

From the question, The kinetic energy of the fired arrow is equal to the work done by the bale of hale in stopping the arrow.

We make use of the following formula

mv²/2 = F'd................... Equation 1

Where

Make F' the subject of the equation

F' = mv²/2d.................. Equation 2

From the question,

Given:

Substitute these values into equation 2

Hence, The average stopping force acting on the arrow is 90 N

Learn more about average stooping force here: https://brainly.com/question/13370981

The shortest distance in which you can stop, after the breaks are applied is 80.38 m.

The shortest distance in which you can stop is calculated by applying the principle of conservation of energy and work energy principle.

K.E = ¹/₂mv²

where;

K.E is your kinetic energy

m is your mass

v is your speed

The work done by force of friction before you stop is calculated as follows;

W = Ffx

where;

W = (μmg)x

where;

W = K.E

(μmg)x = ¹/₂mv²

(μg)x = ¹/₂v²

x = (v²) / (2μg)

x = (32²) / (2 x 0.65 x 9.8)

x = 80.38 m

Thus, the shortest distance in which you can stop, after the breaks are applied is determined by applying the principle of conservation of energy.

Learn more about conservation of energy here: https://brainly.com/question/166559

#SPJ1

The complete question is below:

Your are driving at 32 m/s, what is the shortest distance in which you can stop, after the brakes are applied, without the groceries sliding off the seat? The static and kinetic coefficients of friction are, respectively, 0.65 and 0.45. Assume that the surface of the seat is horizontal.

To calculate the average air resistance acting on the winner of the race, we need to use the formula:

Work = Force * Distance

In this case, the work done against air resistance is given as 3,360,000 J. However, we do not have the distance traveled or the time taken to complete the race.

Without knowing the distance or time, it is not possible to calculate the average air resistance. Additional information, such as the speed or any other relevant data, would be required to determine the average air resistance.

Learn more about work done, here:

https://brainly.com/question/13662169

#SPJ1

Your question is incomplete, but your full question can be:

During the race competitors work against air resistance. The work done against air resistance by the winner of the race was 3,360,000 J. Calculate the average air resistance acting on the winner of the race.

The vehicle was traveling at a constant speed. So, the correct option is A.

The distance-time graph of the toy vehicle upto 40 seconds is given.

From the graph, it is shown that the motion of the toy vehicle from the time zero second to 30 seconds is represented by a linear curve. That means the distance travelled by the toy vehicle varies equally with equal intervals of time.

If the distance of an object varies equally according to equal intervals of time, the object is said to be under uniform motion.

The speed of an object moving under uniform motion will always be constant.

Therefore, the speed of the toy vehicle shown during the first 30 seconds is constant speed.

To learn more about constant speed, click:

https://brainly.com/question/13672913

#SPJ1

Answer:

uh finish the question please lol.

Answer:

Explanation:

The correct option that describes a different evolutionary stage of a star like the sun is:

D) It becomes a white dwarf after exploding as a supernova

This is because a star like the sun does not have enough mass to undergo a supernova explosion. After it has exhausted all the fuel in its core, it will evolve into a red giant and then a planetary nebula, leaving behind a small, hot, dense remnant known as a white dwarf. Supernovae occur in much more massive stars that have cores that can collapse to form a neutron star or black hole.

Answer:

5000N

Explanation:

According to Newton's second law of motion, the net force (∑F) acting on a body is the product of the mass (m) of the body and the acceleration (a) of the body caused by the force. i.e

∑F = m x a             -------------(i)

From the question, the net force is the combined effect of the thrust (F) and the friction force (Fₓ). i.e

∑F = F + Fₓ             -------------(ii)

Where;

Fₓ = -200N       [negative sign because the friction force opposes motion]

Combine equations(i) and (ii) together to get;

F + Fₓ = m x a

F = ma - Fₓ         -------------(iii)

Where;

m = mass of car = 1200kg

a = acceleration of the car = 4m/s²

Now substitute the values of m, a and Fₓ into equation (iii) as follows;

F = (1200 x 4) - (-200)

F = 4800 + 200

F = 5000N

Therefore, the force the thrust is providing is 5000N

The three rules of refraction for converging lenses, also known as convex lenses, are as follows:

1. The incident ray parallel to the principal axis refracts through the lens and passes through the focal point on the opposite side of the lens.

2. The incident ray passing through the focal point refracts and emerges parallel to the principal axis.

3. The incident ray passing through the center of the lens continues undeviated.

The three rules of refraction for converging lenses, also known as convex lenses, are as follows:

1. The incident ray parallel to the principal axis refracts through the lens and passes through the focal point on the opposite side of the lens.

When a ray of light traveling parallel to the principal axis (the horizontal line passing through the center of the lens) enters a converging lens, it refracts and bends toward the principal axis. After refraction, the ray passes through the focal point on the opposite side of the lens. This rule is essential in understanding the behavior of light rays in converging lenses.

2. The incident ray passing through the focal point refracts and emerges parallel to the principal axis.

When a ray of light passes through the focal point before entering the lens, it refracts and emerges parallel to the principal axis. This rule implies that light rays that enter the lens at different angles converge and meet at the focal point on the opposite side.

3. The incident ray passing through the center of the lens continues undeviated.

When a ray of light passes through the center of a lens, it continues in a straight line without deviating from its path. This rule is derived from the fact that the refractive index of the lens material is the same throughout, resulting in no change in the direction of light passing through the center of the lens.

These rules of refraction for converging lenses help in understanding how light rays interact with the lens and how the lens focuses incoming light. By applying these rules, one can predict the behavior of light rays and determine the location and characteristics of images formed by converging lenses.

For more such information on: refraction

https://brainly.com/question/27932095

#SPJ8

The density of water is approximately 1 g/cm^3. Therefore, the volume of 2800 g of water would be 2800 cm^3 because density is mass/volume, and so volume is mass/density.

Since this volume is inside a cubic box, the length of each side of the cube (a, for instance) could be found by taking the cubic root of the volume. This is because the volume of a cube is calculated by a^3 (length of one side cubed). Hence, a = cube root of 2800 cm^3 ≈ 14.1 cm.

Converting centimeters to meters (as 1 meter is equal to 100 centimeters), we get approximately 0.141 meters.

So the filled cubic box has a side length of approximately 0.141 m.

Answer: D

Explanation:

The mass number of an element is the total number of protons and neutrons in the nucleus of the atom.

Mass number is the total number of protons and neutrons in an atomic nucleus with symbol: A.

An atom is the smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons.

The atom of an element is made up of the following subatomic particles;

The sum of the proton and neutron in the atom's nucleus is the atom's mass number.

Learn more about atoms at: https://brainly.com/question/18803094

#SPJ1

The magnitude of the initial acceleration of the object is 4.2 m/s².

The tension in the string once the object starts moving is 13.65 N.

The magnitude of the initial acceleration of the object is calculated by applying Newton's second law of motion as follows;

F(net) = ma

m₂g - μm₁g cosθ = a(m₁ + m₂)

where;

(4.75 x 9.8) - (0.535 x 3.25 x 9.8 x cos40) = a(3.25 + 4.75)

33.5 = 8a

a = 33.5/8

a = 4.2 m/s²

The tension in the string once the object starts moving is calculated as;

T = m₁a

T = 3.25 x 4.2

T = 13.65 N

Learn more about acceleration here: https://brainly.com/question/14344386

#SPJ1

Answer:

organ

Explanation:

The organ removal is the process that involves deep examination. The vital organs may be removed or transplanted if they suffer some sort of disease. The human body has two lungs and two kidneys, if there is a failure or disease in one of these organ the patient can survive without any transplant. In case of heart disease the transplant is the only option that a patient may have. The exact procedure for removal of these organ is determined after deep examination of patient and identifying his history of diseases.

The apparatus that can used to measure the mass of the wooden block​ by the student is called beam balance.

A beam balance, often referred to as a double-pan balance, is a straightforward tool for determining an object's weight. Two pans or trays are hung from either end of a horizontal beam that is suspended from a pivot point in the middle.

The thing to be weighed is put on one tray, and then the second tray is filled with standard weights until it balances, showing the weight of the object. From little ones used in laboratories to larger ones used in enterprises, beam balances can be found in a variety of shapes and sizes. Because they are precise and operate without electricity or batteries, they are widely used.

To know more about beam balance, visit,

https://brainly.com/question/30386877

#SPJ1

The index of refraction for the material is 1.612.

The index of refraction (n) of a material can be calculated using the formula:

n = c / v

where c is the speed of light in vacuum and v is the speed of light in the material.

Given that the speed of light in the material is 1.862x\(10^8\) m/s, we can substitute the values into the formula:

n = (3.00x\(10^8 m/s) / (1.862x10^8 m/s\))

Simplifying the expression:

n = 1.612

Therefore, the index of refraction for the material is approximately 1.612.

For more such information on: refraction

https://brainly.com/question/27932095

#SPJ8

A program that could do an instantaneous analysis of video motion will be useful it in a sportscast to analyze events as they occur.

A motion video is defined as the display of video images at a rate (such as thirty frames per second) that causes objects to appear to move smoothly and continuously.

Sports inherently involve fast and accurate motion, which can be difficult for competitors to master but also for coaches and trainers to analyze and audiences to follow. Because of the nature of most sports, monitoring with sensors or other devices attached to players or equipment is generally not possible. This opens up a plethora of opportunities for the use of computer vision techniques to assist competitors, coaches, and the audience

Learn more about motion on:

https://brainly.com/question/27802581

#SPJ1

Answer:

HIV attacks a specific type of immune system cell in the body. It's known as the CD4 helper cell or T cell. When HIV destroys this cell, it becomes harder for the body to fight off other infections.

Explanation:

Answer:

true b and c

Explanation:

n the electromechanical transitions of the atoms the relationship must be fulfilled

        \(\frac{x}{\lambda }\) = R (1 / nf - 1 / no²)

where for the final state nf = 1 giving in the case of hydrogen the Lymma series whose smallest wavelength is lam = 122 nm with nf = 1 and there are a series of spectral lines for each value of n of the final state

in the case of sodium so well it has a transition from an excited state to the kiss state (bad)

Now let's review the different proposals

a) False. The electronic potential for sodium is much lower than for hydrognosia

b) True

c) True

d) true

The speed of the car just after the gravel is loaded is 2.8m/s.

An isolated system experiences a change in momentum to zero when the starting and final velocities are equal. The reactions between the particles are separated from the surroundings. Momentum is conserved, so we use the rule of conservation of momentum, which is expressed by the equation

   \(P_{f}\)=\(P_{i}\)(1)

Railway is frictionless due to isolated mechanism. The thing travels at a momentum p-based speed while having mass. m

An object's bulk and velocity v are combined to form a vector.Equation of the form gives the velocity.

\(p=mv\)

Using expression p into equation (1)

\(m_{f}v_{f}\)=\(m_{i}v_{i}\)(2)

The final mass of a car is its original mass plus the mass of the gravel added. A car has an initial mass of.10000Kg  preliminary pace is

\(m_{f}\)=10000Kg+4000Kg=14000Kg

initial speed 4m/s

the final speed should be found after solving the equation(2) for \(v_{f}\)

\(v_{f}\)=\(\frac{m_{i}v_{i} }{m_f} }\)=\(\frac{10000Kg(4m/s)}{1400Kg}\)=2.8m/s

learn more about speed here:

https://brainly.com/question/17661499

#SPJ1