Andy is waiting at the signal. As soon as the light turns green, he accelerates his car at a uniform rate of 8.00 meters/second2. What is the displacement of Andy’s car after 30.0 seconds?

Answers

Answer 1

Answer:
-- Accelerating at the rate of 8 m/s², Andy's speed
   after 30 seconds is

   (8 m/s²) x (30.0 s) = 240 m/s .

-- His average speed during that time is

   (1/2) (0 + 240 m/s) = 120 m/s .

-- In 30 sec at an average speed of 120 m/s,
   Andy will travel a distance of
   (120 m/s) x (30 sec) = 3,600 m

    = 3.6 km .

"But how ? ! ?", you ask.

How in the world can Andy leave a stop light and then
cover 3.6 km = 2.24 miles in the next 30 seconds ?

The answer is: His acceleration of 8 m/s², or about 0.82 G
is what does it for him.

At that rate of acceleration ...

-- Andy achieves "Zero to 60 mph" in 3.35 seconds,
   and then he keeps accelerating.

-- He hits 100 mph in 5.59 seconds after jumping the light ...
   and then he keeps accelerating.

-- He hits 200 mph in 11.2 seconds after jumping the light ...
   and then he keeps accelerating.

-- After accelerating at 8 m/s² for 30 seconds, Andy and his
   car are moving at 537 miles per hour !
   We really don't know whether he keeps accelerating,
    but we kind of doubt it.

A couple of observations in conclusion:

-- We can't actually calculate his displacement with the information given.
   Displacement is the distance and direction between the starting- and
   ending-points, and we're not told whether Andy maintains a straight line
   during this tense period, or is all over the road, adding great distance
   but not a lot of displacement.

-- It's also likely that sometime during this performance, he is pulled
   over to the side by an alert cop in a traffic-control helicopter, and
   never actually succeeds in accomplishing the given description.

Related Questions

The dark, smooth surface areas of the Moon are known asA. craters.B. rilles.C. maria.D. highlands.
A 1.7-kg block of wood rests on a rough surface. A 0.011-kg bullet strikes the block with a speed of 670 m/s and embeds itself. The bullet-block system slides forward 2.4 m before coming to rest.
A 4,000-kg car traveling at 20m/s hits a wall with a force of 80,000 N and comes to a stop. What was the impact time?
a train is moving at 4.0 km/h. It accelerates at 60 km/h/s for 0.75 h. What is its speed by the of the 0.75 h
A wave will "break" because ________. a wave will "break" because ________. the sediment load of water is greater near the shore of random molecular motion in wave forms the density of water increases closer to shore the bottom interferes with its oscillatory motion the wind increases its speed near shorelines

Air is warmed and moisten as it moves through both the mouth and nasal passages.a. True
b. False

Answers

Answer: The given statement is true.

Transport of oxygen from the air takes place through respiratory system. Oxygen from air ( that is taken from the atmosphere) enters via a system of tubes, into our lungs and then it is released into the bloodstream ( to serve in various organs) whereas opposite route is followed by CO2 ( carbon dioxide).

In the respiratory tract, the nose is lined by mucosal epithelium that possessed glands ( which secrete thick mucus). Due to this, air is moistened. Beneath the epithelium surface, there lies network of blood vessels that help in warming the nasal cavity and thus the air is warmed.

Answer: True

Explanation: On Edge 2020

What happens as a result of an increase in the intensity of a sound wave? -the frequency of a soundwave increases. -the velocity of the sound wave decreases. -the energy of the soundwave increases. -the amplitude of the soundwave decreases

Answers

As a result of an increase in the intensity of a sound wave, the energy of the sound wave increases!

Answer: c. The energy of the sound wave increases.

Explanation:

Which of the following describes volumeA.the number of particles or amount of matter
B.the amount of space that matter ocupies
C.how fast the particles are moving
D.amount of massin a certain place

Answers

B.the amount of space that matter ocupies

Cheryl has a mug that she says is made up of matter. Heather says that the hot chocolate inside the cup is made up of matter, too. Keaton says that the steam coming from the cup is also made up of matter. Mikayla says that none of it is matter because matter is too small to see. Which best describes who is correct?

Answers

They are all correct. All of the substances referred to are indeed matter and matter is too small to be seen by eye. But when it stacks up together, then it becomes visible. Million and millions of small particles form up and form the visible matter.

Answer:

Cheryl, Heather, and Keaton

Explanation:

if an object is moving at a constant speed in one direction, what is needed to change its speed or direction?.

Answers

Force is needed to change the speed or direction of an object moving at a constant speed.

We have an object is moving at a constant speed in one direction.

We have to determine what is needed to change its speed or direction.

Is Speed scalar or vector quantity ?

Speed is a scalar quantity as it has only magnitude and no direction.

According to the question, we have -

An object is moving at a constant speed in one direction. Now in order to change its speed or direction we need something to change its current state in which it is moving with constant speed in one direction. According to Newton's first law of motion, any body continues to be in its current state, unless some external force is applied on it. Hence, a certain amount of Force is needed in order to change its speed or direction.

Hence, Force is needed to change the speed or direction of an object moving at a constant speed.

To solve more questions on Force, visit the link below-

brainly.com/question/13482747

#SPJ2

Any considerable amount of force is needed to change the speed of an object, if it is moving with constant speed in one direction. If the force applied is in the same direction in which an object is moving, speed of the object will increase. If force is in opposite direction of the motion, speed of object will decrease. If force is always perpendicular to the direction of motion of an object, it will move in a circle.

Further explanation:

Newton’s first law states that an object will remain in its initial state of the motion until and unless an external force is applied on the object. It means, object will remain in motion if it was in motion and it will remain at rest if it was initially at rest until and unless an external force is applied on the object.

Given:

An object is moving at a constant speed in one direction.

Concept:

Acceleration is defined as the rate of change of velocity with respect to time. Acceleration will be zero if change in the velocity with time is zero.

We know that velocity is a vector quantity because it has magnitude as well as the direction.

In the question object is moving in one direction, therefore direction is not changing with time, and also the magnitude of the velocity of an object is constant. So the acceleration of the object is zero.

Acceleration is caused due to the force. If all the forces on the object are in equilibrium, the net force on the object will be zero and acceleration of object will also be zero.

Now if we want to change the speed or direction of the object, it is needed to exert an external force on the object. If a net force is exerted on the object, it will be subjected to an acceleration which causes change in speed or change of direction of the object.

Thus, any considerable amount of external force is needed to change the speed or direction of the object.

Learn More:

1. A 30kg block being pulled across a carpeted floor brainly.com/question/7031524

2. Net force acting on a 200kg refrigerator brainly.com/question/7031524

3. Max and Maya are riding on a merry-go-round brainly.com/question/8444623

Answer Details:

Grade: High School

Subject: Physics

Chapter: Laws of motion

Keywords:

Object, moving, constant, speed, one, direction, needed, change, speed, direction, considerable, force, acceleration, zero acceleration.

A material that provides little or no resistance to the flow of electric current is called a(an) A. circuit / B. conductor / C. insulator / D. resistor.

Answers

The correct answer is (b.) conductor. A material that provides little or no resistance to the flow of electric current is called a conductor. A conductor is a known material that is used for a smooth flow of current with any barrier in one or more directions.

The correct answer is B) Conductor

A conductor is a material that allows for the flow of electrical charge (electrical current). This type of material provides little or no resistance to the flow of electric current. This is due to the fact that these type of materials have free electrons which conduct the flow of electrical current in any direction.

Different types of conductors have different resistances. Some types of materials are good conductors whereas some are not so good.

Some common conductors are Copper, gold, silver and aluminium.

An insulator is the an object of type of material which have a strong resistance to the flow of electric current. Some common insulators are glass, wood and plastic.

Other Questions

A child sliding down the slide at a park is an example ofA. positive acceleration B. negative acceleration C. no acceleration D. velocity

The majority of visible stars are _____ stars.a. neutron b. red giant c. white dwarf d. main sequence

Magma that cools and crystallizes on Earth's surface forms A. quartz. B. marble. C. intrusive rocks. D. extrusive rocks.

Must be 8 letters (Dimensional Analysis escape room)