John took 45 minutes to bicycle to his grandmother's house, a total of 4 kilometers. what was his speed in km/hr?

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Answer:

The limitations of the experiment are those characteristics of design or methodology that impacted or influenced the application or interpretation of the results of your study.

Answer:

Explanation:

Evolution is both a fact and a theory. Evolution is widely observable in laboratory and natural populations as they change over time. The fact that we need annual flu vaccines is one example of observable evolution. At the same time, evolutionary theory explains more than observations, as the succession on the fossil record. Hence, evolution is also the scientific theory that embodies biology, including all organisms and their characteristics. In this paper, we emphasize why evolution is the most important theory in biology. Evolution explains every biological detail, similar to how history explains many aspects of a current political situation. Only evolution explains the patterns observed in the fossil record. Examples include the succession in the fossil record; we cannot find the easily fossilized mammals before 300 million years ago; after the extinction of the dinosaurs, the fossil record indicates that mammals and birds radiated throughout the planet. Additionally, the fact that we are able to construct fairly consistent phylogenetic trees using distinct genetic markers in the genome is only explained by evolutionary theory. Finally, we show that the processes that drive evolution, both on short and long time scales, are observable facts.

The evolutionary theory is a scientific theory because its assumptions are well sustained by scientific data.

In conclusion, the evolutionary theory is a scientific theory because its assumptions are well sustained by scientific data.

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George Washington was an American political leader, military general, statesman and Founding Father of the United States, who serves as the first president of the United States from 1789 to 1797.

During the American Revolution, the led the colonial forces to victory over the British and became a national hero. In 1787, he was elected president of the convention that wrote the U.D. constitution. Two years later, Washington became the America's first president.

Answer:me

Explanation:I do

Answer:

car D

Explanation:

1) before to compare all the values of the velocities, they must be in the same units of measurement. It means:

for car A: V=60km / 1h=60km/h;

for car B: V=30km / 0.5h=60km/h;

for car C: V=20km / 0.25h=80km/h;

for car D: V=10km / (7/60)h≈85.7km/h.

2) according to the values calculated in item 1 the car D had the highest velocity.

Answer:

Below

Explanation:

We can use this formula to find the velocity of an object

     velocity = displacement / change in time

*note I converted all distances to meters and all times to seconds, its not necessary though**

CarAvelocity = 60,000 m / 3600 sec

                      = 16.66667 m/s

CarBvelocity = 30,000 m / 1800 sec

                     = 16.66667 m/s

CarCvelocity = 20,000 m / 900 sec

                      = 22.2222 m/s

CarDvelocity = 10,000 m / 420 sec

                      = 23.80952 m/s

Therefor, car D has the highest velocity

Hope this helps!

Answer:

speed /wavelength = frequency

f = 3×10*8 /6.5×10*7

f = 4.62

Answer:

Explanation:

A barometer is a scientific instrument used to measure atmospheric pressure, also called barometric pressure.

Answer:

Barometer

Explanation:

Its units are atmospheres (atm) or bars.

It means The student walked for 5s with a velocity of 10m/s

Distance=Velocity(Time)

[tex]\\ \rm\longmapsto Distance=10(5)[/tex]

[tex]\\ \rm\longmapsto Distance=50m[/tex]

Answer:

[tex]\sf\longmapsto \: 50 \: metres[/tex]

Explanation:

Given,

Velocity is 10m/s

Let us find the time:

[tex]\sf\longmapsto \: 10 - 5[/tex]

[tex]\sf\longmapsto \: 5 \: seconds[/tex]

Now,We know that Distance = Velocity × Time

[tex]\sf\longmapsto \: 10 \times 5[/tex]

[tex]\sf\longmapsto \: 50 \:metres[/tex]

Answer:  B) 14.7 meters

============================================================

Explanation:

The bottle cap is a projectile, so we'll use the aptly named projectile formula

That formula (the meters version of it anyway) is approximately

h = -4.9t^2 + v*t + s

where,

We'll assume that s = 0, though realistically it's probably going to be a bit larger than this (since the person is holding it above the ground). For the sake of simplicity, we'll stick with s = 0.

We're told that the initial velocity is 17 m/s, which means v = 17.

All of that means the formula mentioned earlier updates into this:

h = -4.9t^2 + 17t

If we were to graph this, or apply the -b/(2a) formula, then you should find that the vertex occurs when t = 1.73469 approximately.

Plug this into the equation we found to get...

h = -4.9t^2 + 17t

h = -4.9(1.73469)^2 + 17(1.73469)

h = 14.7449

h = 14.7

The bottle cap will reach a peak height of approximately 14.7 meters and does so at around the 1.7 second mark. The total flight time is approximately 2*1.7 = 3.4 seconds. This all assumes that the starting height and ending height are both 0 meters off the ground.

The soda will go as high as 14.7 meters. Therefore, option (B) is correct.

We can solve this problem using the conservation of energy principle, which states that the initial energy of a system is equal to the final energy. At the start, the soda in the bottle has some potential energy due to its position and kinetic energy due to its motion. When the soda shoots out of the bottle, it converts all of its initial energy to potential energy as it reaches its maximum height.

Using the conservation of energy, we can write:

Initial energy = Final energy

[tex]0.5 * m * v^2 = m * g * h[/tex]

where m is the mass of the soda, v is its velocity, g is the acceleration due to gravity ([tex]9.8 m/s^2[/tex]), and h is the height it reaches.

Solving for h, we get:

h = [tex](v^2)/(2g) = (17^2)/(29.8)[/tex]= 14.7 m

Therefore, the soda will go as high as 14.7 meters. Option B is correct.

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Explanation:

You have already determined the components of the known forces so I won't repeat your work here. Since the resultant force [tex]\vec{\textbf{R}}[/tex] and F1 are completely along the x-axis, we can conclude that

[tex]F_{2y} = F_{3y} \Rightarrow F_{3y} = F_3\cos{\theta} = 250\:\text{lb}[/tex]

We can now solve for the magnitude of [tex]F_3:[/tex]

[tex]F_3 = \sqrt{F_{3x}^2 + F_{3y}^2} = \sqrt{(467)^2 + (250)^2}[/tex]

[tex]\:\:\:\:=529.7\:\text{lb}[/tex]

The angle [tex]\theta[/tex] is then

[tex]\tan{\theta} = \dfrac{F_{3y}}{F_{3x}} = \dfrac{250}{467}[/tex]

or

[tex]\theta = 49.2°[/tex]

Answer:

7.5 miles

Explanation:

0.25 hours=15minutes.

So you do

30 miles=60minutes

x =15minutes

cross multiply

Ans-7.5

Answer:

The first is the closest in absolute values.

The second two are vague and the last is approximate.

Answer:

» An electron is lighter than a proton.

explanation:

[tex]{ = \: \sf{an \: electron \: has \: formula \: \: }}{ \bf{ {}^{0}_{ - 1}e }}[/tex]

hence it's mass number is zero

[tex]{ = \: \sf{an \: electron \: is \: helium \: particle \: \: }}{ \bf{ {}^{4} _{2}He }}[/tex]

hence it's mass number is 4

Therefore, proton is heavier than electron

» An electron has a small charge magnitude than a proton.

Explanation:

An electron has charge of -1 while proton has charge of +2, therefore electron is less deflected by any energetic fields than a proton

Answer:

According that theory protons and neutrons have a strong force charge. ... Electrons are not affected by the nuclear strong force. Without a source for this additional energy the neutron cannot decay. Hence the neutron in a deuteron is stable.

The addition of electrons to the hadrons would allow for a 'stable and electrically neutral' environment due to electromagnetic attraction between electrons and protons and nuclear attraction between neutrons and protons.

To find reason, we need to know about electromagnetic force and nuclear force.

Thus, we can conclude that the addition of electrons to the hadrons would allow for a 'stable and electrically neutral' environment due to electromagnetic attraction between electrons and protons and nuclear attraction between neutrons and protons.

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Answer:

9 times more kinetic energy

Explanation:

KE₀ = ½mv²

KE₁ = ½m(3v)² = 9(½mv²) = 9KE₀

Answer:

downwards bro now dodododododdodo

Answer:

[tex]vertically \: downward \\ to \: the \: cenre \: of \: earth \\ thank \: you[/tex]

Explanation:

A perfectly elastic collision is defined as one in which there is no loss of kinetic energy in the collision. An inelastic collision is one in which part of the kinetic energy is changed to some other form of energy in the collision.

Answer:

arrow E represents cycling of carbon from living organisms to non-living organisms. this is because it is showing conversion of a carbon from the dead tree to fossil fuel.

________________________________________________________

Darkspirit :)

Answer:

Scintillators are materials that transform high-energy radiation like X-rays or gamma-rays into visible light or near-visible light. They're commonly utilized in medical diagnostics, high-energy physics, and geophysical exploration as detectors.

Explanation:

i hope this helps

The answer you are looking for is S=D/T, which is the formula.

It is also read as Speed=Distance/Time, or Speed=Distance divided by Time.

The "S" stands for "Speed."

The "D" stands for "Distance."

The "T" stands for "Time."

I hope this has helped answer your question. Enjoy your day, and take care.

Answer:

The formula is S=D/T.

Explanation:

Explanation:

power = force × velocity

velocity=power/force

=(30×1000)/910

=32.97m/s

The correct answer is 32.97m/s.

By using the formula:

power = force × velocity

velocity = power / force

= (30×1000)/910

= 32.97m/s

The answer is 32.97m/s.

Maximum speed is the highest rate of speed an athlete can attain. Acceleration refers to velocity, and because velocity has both a magnitude and direction associated with it, acceleration changes when athletes change the magnitude of their motion (how fast they are running), the direction of their motion, or both.

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How do we find the Average Speed ?

The Average Speed is the distance traveled for the object, divided by the elapsed time taken to travel that distance, so the formula is :

S = D / T

where S = Average Speed, D = Distance, and T =  Times

Here the object is the ball, the distance is 9 meters and the time elapsed for the ball to roll down the street is 3.5 seconds. Applying the formula we get :

S = 9 / 3.5 ≈ 2.6 metres per second

The ≈ symbols (which is the wavy equal sign) means we can't write the exact result, because there is an infinite quantity of numbers after the decimal point. So we need to give an approximation, since the result is 2.57142857142857...etc. we choosed to round up the result to 2.6.

Answer:

i think the answer was

B.Salmonella on dog food

The cause of the illness was Salmonella on dog food, therefore the correct answer is option B.

Science is the methodical, empirically-based pursuit and application of knowledge and understanding of the natural and social worlds.

As stated in the article, the dog food manufacturing facility was shut down while the situation was looked into.

Four times in the preceding five months, the pet food manufacturer had to recall food that was produced at the same factory.

The business said in a statement after reopening the facility that it has taken steps to address the issues caused by Salmonella in dog food.

Thus, the cause of the illness was Salmonella on dog food, therefore the correct answer is option B.

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Answer: see below:

The universe experiences the opposite energy change as the surroundings to keep the total energy of the system constant. The energy of the system, surroundings, and universe must be equivalent. The energy of the universe must remain 0, so the energy of the system and surroundings cannot change. I reaaallly hope this helped, luv ya, have a nice day!! <333

[tex]{\huge{\pink{↬}}} \:  \: {\huge{\underline{\boxed{\bf{\pink{Answer}}}}}}[/tex]

The lower jaws present in the vernier callipers is used to measure the external diameter or thickness of pencils etc...

Answer:

use formula a equal to v-u by t

Answer:gang gang father gang

Explanation:idek cuh

If the bulb's resistance doesn't change, the power it uses is proportional to the square of the voltage. So doubling the voltage quadruples the power.

On 220 V, the bulb uses (4 • 40w)= 160 W.

It glows very brightly.

For a very short time.

Because it also gets very hot, and burns out.

After a few seconds, it uses zero watts.

Answer:

160

Explanation:

Acellus

Answer:

50µs

Explanation:

The conversion is that 1 second equals 1,000,000 micro seconds. Since we have 0.00005 seconds, we will multiply that to a million.

0.00005 * 1,000,000 = 50µs

Keep in mind that 50 only has 1 significant figure because any trailing zeroes before the decimal point do NOT count.

Best of Luck!

0.00005 seconds = 50 μs

Thank you