1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
ella [17]
3 years ago
5

You slam on the brakes of your car in a panic and skid a distance X on a straight, level road. If you had been traveling half as

fast under the same road conditions, you would have skidded a distance

Physics
1 answer:
Mariulka [41]3 years ago
7 0

Answer:

The required skidded distance would be one-forth of the distance skidded if the velocity of the car becomes half.

Explanation:

If 'v_{0}' be the velocity of the car where the brakes are slammed on and 'a' be the constant deceleration gained by the car before coming to stop after skidding a distance 'X' at time 't' where final velocity 'v_{t} = 0', then as can be seen from the figure,

&& v_{t} = v_{0} - a~t\\&or,& 0 = v_{0} - a~t\\&or,& t = \dfrac{v_{0}}{a}

If from any arbitrarily chosen point 'O', 'x_{0}' be the distance where the brakes are slammed on and 'x_{t}' be the distance from the same point 'O' where the car stops, then

&& x_{t} = \int\limits^t_0 {v_{t}} \, dt\\        = \int\limits^t_0 ({v_{0} - a~t}) \, dt\\  = v_{0}~t - \dfrac{1}{2}~a~t^{2} + x_{0}\\\\&or,& x_{t} - x_{0} =  v_{0}~t - \dfrac{1}{2}~a~t^{2}\\&or,& X = v_{0}~\dfrac{v_{0}}{a} - \dfrac{a}{2}(\dfrac{v_{0}}{a})^{2}\\&or,& X = \dfrac{v_{0}^{2}}{a}

Now if the car would have been moving with a velocity '\dfrac{v_{0}}{2}' and would have been skidding a distance 'Y', then from the above equation substituting the velocity we can have

Y = \dfrac{X}{4}

So, if the car were moving at half as fast under the same road conditions, it would have skidded by a distance which is one-forth of the present skidded distance.

 

You might be interested in
Water on the kitchen floor at home is considered a safety hazard.
svp [43]
Yes it is, cause someone could slip and accidentally stab themselves
6 0
3 years ago
Read 2 more answers
If the change in kinetic energy of a tennis ball hit by the racket
Marrrta [24]

Answer: .36 m

Explanation:

5 0
3 years ago
Question 8 of 10
-BARSIC- [3]

Answer:

The correct answer is the Convex lens. An image is formed when a ray of light coming from a point intersects at another point. The image is formed by the real intersection of light. The image is formed by the virtual intersection of Light.

here is the site : textbook.com

3 0
2 years ago
A small 18 kilogram canoe is floating downriver at a speed of 1 m/s. What is the canoe's kinetic energy?
In-s [12.5K]

Kinetic energy = (1/2) (mass) (speed²).

A Physicist in the canoe, or on a raft floating downriver next to the canoe, will say that the canoe's kinetic energy is zero.

A Physicist on the riverbank, watching the canoe drift by at 1 m/s, will say that its kinetic energy is 9 Joules.

They're both correct.

8 0
3 years ago
What’s The Answer, To The Question In The Photo
Sedbober [7]

Answer:

The correct answer is the third option: The kinetic energy of the water molecules decreases.

Explanation:

Temperature is, in depth, a statistical value; kind of an average of the particles movement in any physical system (such as a glass filled with water). Kinetic energy, for sure, is the energy resulting from movement (technically depending on mass and velocity of a system; in other words, the faster something moves, the greater its kinetic energy.

Since temperature is related to the total average random movement in a system, and so is the kinetic energy (related to movement through velocity), as the thermometer measures <u>less temperature</u>, that would mean that the particles (in this case: water particles) are <u>moving slowly</u>, so that: the slower something moves, the lower its kinetic energy.

<u>In summary:</u> temperature tells about how fast are moving and colliding the particles within a system, and since it is <em>directly proportional</em> to the amount of movement, it can be related (also <em>directly proportional</em>) to the kinectic energy.

4 0
3 years ago
Other questions:
  • How would the forces in a nucleus change if the number of neutral particles in the nucleus were increased?
    8·2 answers
  • Why is friction important for gymnast working on parallel bars
    12·1 answer
  • A student is helping her teacher move a 9.5 kg box of books. what net sideways force must she exert on the box to slide it acros
    9·1 answer
  • In the atmosphere water vapor condenses to form clouds.   Please select the best answer from the choices provided T F
    11·2 answers
  • What is the magnitude of the detected sound frequency shift from 170 Hz during the projectile flight described in the passage?
    9·1 answer
  • Waves are observed passing under a dock. Wave crests are 8.0 meters apart. The time for a complete wave to pass by is 4.0 second
    7·2 answers
  • Water towers store water above the level of consumers for times of heavy use, eliminating the need for high-speed pumps. How hig
    5·1 answer
  • Please help me
    12·1 answer
  • 400 Kelvin to degrees Celsius​
    10·2 answers
  • 4. Un móvil viaja en línea recta con una velocidad media de 1200 cm/s durante 9 s, y luego con velocidad media de 480 cm/s duran
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!