1. João tem um tempo de reação de 0,2 s, pedala a bicicleta com velocidade de 5 m/s. Ele se depara com uma situação de emergência e aciona os freios. Qual foi a distância percorrida antes de frear? Tempo = 0,2s Velocidade = 5m/s = ou = ⋅

Answers

Answer 1

Responda:

1 metro

Explicação:

Dado que :

Tempo de reação = 0,2 segundos

Velocidade de deslocamento = 5 m / s

A distância percorrida antes da frenagem pode ser obtida usando a relação:

Distância = velocidade de viagem * tempo de reação

Distância percorrida antes da frenagem = (5 m / s) * (0,2s)

Distância percorrida antes da frenagem = 1 metro


Related Questions

A ball is thrown vertically upward with a speed v. An identical second ball is thrown upward with a speed of 1/2 v (half as fast). What is the ratio of the maximum height of the second ball to that of the first ball

Answers

Answer:

1:4

Explanation:

The formula for calculating the maximum height of the ball is expressed as;

H = u²sin²theta/2g

If a ball is thrown vertically upward with a speed v, its maximum height is expressed as;

H = v²sin²90/2g

Since sin90 = 1

H = v²/2g.... 1

If an identical second ball is thrown upward with a speed of 1/2 v, then the maximum height will be expressed as;

H1 = (1/2v)²sin²90/2g

H1 = (v²/4)(1)/2g

H1 = v²/8g ...... 2

Divide both equations

H/H1 = (v²/2g)/(v²/8g)

H/H1 = v²/2g × 8g/v²

H/H1 = 8g/2g

H/H1 = 4

Reciprocate both sides

H1/H = 1/4

H1:H = 1:4

Hence the ratio of the maximum height of the second ball to that of the first ball is 1:4

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the original source of all sand is:
beaches
oceans
rocks
rivers

Answers

Answer:

The original source of all sand is rocks.

Hope I helped sorry if I didnt

Answer:

answer is rocks

Explanation:

It’s rocks because all sand it Little Rock’s that have been smashed into smaller pieces over the years and decade, and that’s how rivers go sand to because some of the broke down rocks would fall into the river and eventually be carried in the ocean and washed in shore. And that’s how we got beaches

A sled is pushed to right with a force of 200 N. The force of friction opposing that motion is 50 N. a) What is the Net Force on the sled? b) assuming the mass of the sled is 30 kg, use Newton's 2nd Law equation to determine the acceleration. Include units in BOTH of your answers! *

Answers

Answer:

Fr = 150 [N]

a = 5 [m/s²]

Explanation:

In order to find the resulting force, we must assume that the thrust force is positive to the right, while the friction force is negative to the left.

[tex]F_{r}=200-50\\F_{r}=150[N][/tex]

Now Newton's Second Law tells us that the sum of the forces or the resulting force is equal to the product of mass by acceleration.

F = m*a

[tex]150 = 30*a\\a=150/30\\a = 5 [m/s^{2} ][/tex]

If the scale model works as predicted, the final product is guaranteed to be flawless.
•True
•False

Answers

Answer: true

Explanation:

If the scale model was working as it was predicted to work, then the final product is expected to be flawless. It should be a reasonable product if the scale model is working. Our answer is the option True.

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When a car of mass 1000kg is travelling along a level road at a steady speed of 20ms −1
its engine is working at 18kW.
Resultant force = 900N Braking Force = 3100N Gravity = 9.81
By how much does this change if the car is travelling down the same hill at 20ms −1 ?

Answers

Answer:

OK draw a diagram - you have the force from (b) acting sown the slope and a component of the weight. Use F=ma to get the deceleration and then use SUVAT. Post your working if this doesn't work.

friction = 900N

braking = 3100N

total = 4000N

w= mxg = 1000*9.81= 9810N

total = 9810 + 4000 = 13810N

force/mass = 13810/1000 = 13.81ms^-2

then using v^2 = u^2 + 2as, i get s as 14 but it is incorrect

Explanation:

three collinear forces,F1=45N west,F2=63N east and an unknown force F3 are applied to an object.The resultant force of the three forces is 12N west.

Show by means of a tail to head method of vector addition how the magnitude of F3 could be found?​

Answers

Take east to be the positive direction. Then the resultant force from adding F₁ and F₂ is

F₁ + F₂ = (-45 N) + 63 N = 18 N

which is positive, so it's directed east.

To this we add a third force F₃ such that the resultant is 12 N pointing west, making it negative, so that

18 N + F₃ = -12 N

F₃ = -30 N

So F₃ has a magnitude of 30 N and points west.

Why does your weight change on the moon

Answers

Answer:

the moon has different gravitational force.

Answer:

Our weight on moon is less than it would be on Earth due to a difference of the strength of gravity on the moon. The moon's gravitation force is determined by the mass and the size of the moon. ... This means that if you went to the moon you would weigh less, even though your mass stays the same!

Explanation:

Please mark brainliest

What is an astronomical unit or AU

Answers

Answer:

D

Explanation:

Answer:

Astronomical Unit = 4.8481×10−6 pc; 1.5813×1.

Or even AU = Equal to

Explanation:

Neeeee rnnnn ASAP offering 55 points CER: Brielle pushes a shopping cart through the store with an acceleration of 2
m/s2. The mass of the shopping cart with the groceries in it is 22 kg. Guiding
Question: How can Brielle increase the acceleration of the shopping cart?

Answers

Answer:

Decease the mass

Increase the force applied

Explanation:

To increase the acceleration of the shopping cart, Brielle should reduce the load inside her cart.

According to Newton's second law of motion;

  Force  = mass x acceleration

Now, mass is indirectly proportional to the acceleration. The more the mass, the lower the acceleration a body will generate.

Lighter bodies moves with a faster acceleration.

In this case the force applied is constant.

If the force applied is also, increased the acceleration of the body will increase also.

A gas sample occupies 6.2 L at a pressure of 201 kPa. What volume will it occupy if the pressure is increased to 335 kPa? The temperature remains the same.

Answers

Answer: The volume of the gas at the increased pressure will decrease to 3.72L.

Explanation:

Boyle's law states that the volume occupied by a fixed mass of gas is inversely proportional to the pressure, provided temperature is kept constant. That is,

PV=K

P1V1 =P2V2

P1= 201 kpa

V1 = 6.2L

P2= 335kpa

V2= ?

Making V2 the subject of formula,

V2= P1V1/P2

V2= 201× 6.2/335

V2= 1246.2/336

V2= 3.72L

Thus, the volume of the gas decreases as the pressure increases. Hope this helps, thanks

Answer:

The volume will be 3.72 L.

Explanation:

We can find the new volume by using the Ideal Gas Law:

[tex] PV = nRT [/tex]

Where:

P: is the pressure

V: is the volume

n: is the number of moles

R: is the gas constant

T: is the temperature

Initially, we have:

[tex]P_{1}V_{1} = nRT[/tex]   (1)

with V₁ = 6.2 L, P₁ = 201 kPa and nRT = constant

When the pressure is increased we have:

[tex] P_{2}V_{2} = nRT [/tex]   (2)

with V₂ =?, P₂ = 335 kPa and nRT = constant

By equating (1) and (2) we have:

[tex] P_{1}V_{1} = P_{2}V_{2} [/tex]

[tex] V_{2} = \frac{P_{1}V_{1}}{P_{2}} = \frac{201 kPa*6.2 L}{335 kPa} = 3.72 L [/tex]

Therefore, the pressure is increased to 335 kPa the volume will be 3.72 L.

I hope it helps you!

A3.0 105 kg freight car moving at 2.5 m/s east, strikes a
stationary 1.5 x 105 kg car. If the two cars end up connected
to each other, what is their resulting velocity?

Answers

Answer:3.4 miles west

Explanation:

The dead sea has a very high salt content. Explain why it is easier for a swimmer to float in the dead sea than in a swimming pool containing fresh water

Answers

Answer:

Dead sea is full of salt.

Explanation:

The water of the Dead Sea is full of salt, which makes it much denser and heavier than freshwater. If you swim in it, you float very easily.

When salt is dissolved in water, for example sea water, dissolved salt adds to the mass of the water and makes the water denser than it would be without salt. Because objects float better on a dense surface, they float better on salt water than fresh water.

Which phrase describes blackbody radiation?
O A. Radiation that is absorbed by an object as it warms
O B. Light given off by an object based on its temperature
O C. Radiation that explains the wave model of light
O D. Light given off by an object based on its color

Answers

Answer:

b

Explanation:

The phrase that describes blackbody radiation is the radiation that is absorbed by an object as it warms.

What is blackbody radiation?

Blackbody radiation is a radiation produced by heated objects, particularly from a blackbody.

In physics, a blackbody, approximated by a hole in a hollow black sphere, absorbs all incident electromagnetic radiation and reflects none.

Therefore, the phrase that describes blackbody radiation is the radiation that is absorbed by an object as it warms.

Learn more about blackbody radiation at: https://brainly.com/question/13934832

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Explain how newtons firdt law of motion follows the second law​

Answers

Answer:

Newton's second law says that F=ma, so if the force applied is zero, then the acceleration must also be zero.

Explanation:

Let's set the equation to 0 = ma. If mass is a nonzero value, then the acceleration must be zero to solve the equation. Therefore, if the force applied to an object is zero, then it will not accelerate (i.e. change speed or direction).

Answer:

It might help u

Explanation:

Newton's First Law states that an object with no net force acting on it remains at rest or moves with constant velocity in a straight line.

Newton's  Second Law states that the acceleration of an object is directly proportional to the net force on the object and inversely proportional to the mass of the object

                      F=ma

So both show relation between force and acceleration that's why we can say both are inter-related

The Newton 2nd law is Basically introduce so that we can obtain a specific relation ship between force and acceleration.

Why's earths magnetosphere important ?

Answers

Answer:

The Earth's magnetic field protects life on Earth, shielding it from damaging radiation and moderating our climate. So the idea that it could completely flip around, or collapse altogether, should cause us

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How do endocytosis and exocytosis differ?

Answers

Answer:

Endocytosis and exocytosis are both forms of active transport. Endocytosis is where materials enter the cell and exocytosis is where materials exit the cell.

Which one produces the brightest light out put on a miniature bulb,the solar panels connected in series or parallel???​

Answers

In series, both bulbs have the same current flowing through them. The bulb with the higher resistance will have a greater voltage drop across it and therefore have a higher power dissipation and brightness. In parallel, both bulbs have the same voltage across them.

A constant horizontal F force began to act on the initially immovable body placed on a horizontal surface. After t time the force ceased to act, and after time 3t from the start of the movement the body stopped. Find the coefficient of friction between the body and the surface if the body mass is m.​

Answers

Answer:

The coefficient of friction is (F/(19.6·m)

Explanation:

The given parameters are;

The force applied to the immovable body = F

The time duration the force acts = t

The time the body spends in motion = 3·t

The acceleration due to gravity, g = 9.8 m/s²

From Newton's second law of motion, we have;

The impulse of the force = F × t = m × Δv₁

Where;

Δv₁ = v₁ - 0 = v₁

The impulse applied by the force of friction, [tex]F_f[/tex] is [tex]F_f[/tex] × (3·t - t) =  [tex]F_f[/tex] × (2·t)

Given that the motion of the object is stopped by the frictional force, we have;

The impulse due to the frictional force = Momentum change = m × Δv₂ = [tex]F_f[/tex] × (2·t)

Where;

Δv₂ = v₂ - 0 = v₂

Given that the velocity, v₂, at the start of the deceleration = The velocity at the point the force ceased to  act, v₁, we have;

m × Δv₂ = [tex]F_f[/tex] × (2·t) = m × Δv₁ = F × t

∴ [tex]F_f[/tex] × (2·t) = F × t

[tex]F_f[/tex] = F × t/(2·t) = F/2

The coefficient of dynamic friction, [tex]\mu _k[/tex] = Frictional force/(The weight of the body) = (F/2)/(9.8 × m)

[tex]\mu _k[/tex] = (F/(19.6·m)

The coefficient of friction, [tex]\mu _k[/tex] = (F/(19.6·m)

A driver brings a car to a full stop in 2.0 s. If the car was
initially travelingat 22 m/s, what is the acceleration?

Answers

Working displayed in the picture below, the answer is -11 m s^-2

Le manque de sommeil peut réduire la production d'insuline par le pancréas. L'insuline est responsable de métaboliser le sucre dans le sang. De quel ordre peut être la réduction d'insuline?Lecteur immersif

Answers

Answer:

Very big.

Explanation:

Very big reduction occurs in insulin production when a person did not sleep in 24 hours. Due to lack of sleep, reduction occurs in the production of insulin by the pancreas. Insulin is a hormone that is responsible for metabolizing sugar in the blood and if insulin is not secreted by the pancreas in normal concentration so the person get diabetes disease due to increasing amount of glucose in the blood.

A cruise started its trip 8:00. its average speed was 100 km/h. when it traveled 2/5 of its journey by 12:00, the boat changed its speed. if the boat was required to arrive at the destination at 17:00 what average speed must the boat travel at for the remaining journey?

Answers

Answer:

Explanation:idk

Potassium chloride forms a solid made up of a highly organized set of
positive and negative particles. Which term describes this solid?
A. An ion
B. A crystal
C. An atom
D. A molecule

Answers

Answer: It is b. a crystal

Explanation:

 

Answer:

B. A crystal

Explanation:

Give three examples of how a cell's shape makes possible the cell's function

WILL GIVE BRAINLIEST

Answers

THIS NEEDS TO STOP NOW!

A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.

Answers

Answer:

True

Explanation:

The main differences between a physical property and a chemical property are mentioned below:

A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points.

While A chemical property describes the ability of a substance to undergo a specific chemical change.

An object at rest will stay at rest until an external force acts on it. What was the external force that acted on the night once the hoop was removed?

Answers

Explanation:

The first law states that a body at rest will stay at rest until a net external force acts upon it and that a body in motion will remain in motion at a constant velocity until acted on by a net external force.Friction is the force between an object in motion and the surface on which it moves. There was a net external force on the night because of change in momentum as the hoop was removed.

What are two reasons that digital storage of data is so reliable?

Answers

Answer:memory chips don’t not break and digital data can usually can be recovered even if storage device stops working

Explanation:

Answer:

Explanation:

Memory chips are sturdy and it is usually possible to recover data from a memory chip even when the device containing it is broken

A driver in a car traveling at a speed of 78 kilometers/h sees a cat 101 m away on the road . How long will it take for the car to accelerate uniformly to a stop in exactly 99 m?

Answers

Answer:

0.353 secs

Explanation:

Using the formula;

ΔS = ut + 1/2at²

ΔS is the change in distance = 101 - 99 = 2m

u is the speed = 78km/hr = 7800/3600 m/s

Speed = 2.17m/s

a is the acceleration = 9.8m/s262

t is the time

Substitute into the equation and get t

2 = 2.17t + 1/2(9.8)t²

2 = 2.17t + 4.9t²

2.17t + 4.9t²- 2 = 0

Factorize

t = -4.9±√4.9²-4(2.17)(-2)/2(2.17)

t = -4.9±√24.01+17.36/4.34

t = -4.9±6.43/4.34

t = -4.9+6.43/4.34

t =1.53/4.34

t = 0.353secs

Hence it will take the car 0.353 secs

A container of height 30cm has a capacity of 1.5litres. What is the height of similar container of capacity 3m^3. ​

Answers

Answer:

Height = 378 cm

Explanation:

see image

How does the appearance of each phase of the moon related to the
moon's position relative to Earth and the sun?

Answers

Answer:Moon phases are determined by the relative positions of the Moon, Earth, and Sun.

Explanation:

Instead, the Moon's phase depends only on its position relative to Earth and the Sun. The Moon doesn't make its own light, it just reflects the Sun's light as all the planets do.

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Name the three major parts of a cell and their functions

Answers

Answer:

cell membrane- controls what goes in and out of a cell

cell wall- protects DNA and other organelles inside a cell

ribosomes-makes and produces proteins

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