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
kenny6666 [7]
2 years ago
8

When running a half marathon (13.1 miles), it took Kevin 8 minutes to run from mile marker 1 to mile marker 2, and 18 minutes to

run from mile marker 2 to mile marker 4. How long did it take Kevin to run from mile marker 1 to mile marker 4? minutes What was Kevin's average speed as he ran from mile marker 1 to mile marker 4? miles per minute 71 minutes after starting the race, Kevin passed mile marker 9. To complete the race in 112 minutes, what must Kevin's average speed be as he travels from mile marker 9 to the finish line?
Physics
2 answers:
Vsevolod [243]2 years ago
7 0

Answer:

It took Kevin 26 minutes to run from markers 1 to 4

His average speed from mile markers 1 to 4 is 0.154 miles/minute

Kevin must run by average speed 0.1 miles/minute to finish the race

Explanation:

Lets explain how to solve the problem

A half marathon 13.1 miles

Kevin took 8 minutes to run from mile marker 1 to mile marker 2 and

18 minutes to run from mile marker 2 to mile marker 4

→ He took 8 minutes and 18 minutes to run from marker 1 to marker 4

→ The total time of the first 4 marker = 8 + 18 = 26 minutes

<em>It took Kevin 26 minutes to run from markers 1 to 4</em>

<em></em>

Average speed is total distance divided by total time

The average speed of Kevin as he ran from mile marker 1 to mile

marker 4 is the 4 miles divides by 26 minutes

→ Average speed = 4 ÷ 26 = \frac{2}{13} = 0.154 miles/minute

<em>His average speed from mile markers 1 to 4 is 0.154 miles/minute</em>

<em></em>

It took Kevin 71 minutes to pass mile marker 9

Kevin need to complete the race in 112 minutes, then what must

Kevin's average speed be as he travels from mile marker 9 to the

finish line?

The total distance of the race is 13.1 miles, he ran 9 miles

→ The remaining distance = 13.1 - 9 = 4.1 miles

He must run 4.1 miles to complete the race

The total time is 112 minutes, he used 71 minutes to run the first 9 miles

→ The remaining time = 112 - 71 = 41 minutes

He must finish the 4.1 miles in 41 minutes

→ His average speed for the last part of the race = 4.1 ÷ 41 = 0.1 mi/min

<em>Kevin must run by average speed 0.1 miles/minute to finish the race</em>

astraxan [27]2 years ago
6 0

Answer:

26 mins

0.1154 miles/min

0.1 miles/min

Explanation:

How long did it take Kevin to run from mile marker 1 to mile marker 4?

Kevin took 8 minutes to run from mile marker 1 to mile marker 2, and 18 minutes to run from mile marker 2 to mile marker 4.

Total = (8+18)=26 minutes

Answer(1): 26 minutes

What was Kevin's average speed as he ran from mile marker 1 to mile marker 4?

Distance from mile marker 1 to mile marker 4= (4-1)=3 miles. It took him 26 minute from mile marker 1 to mile marker 4.

Average speed= Total distance / total time= 3 / 26= 1/9=0.1154 miles per minute

Answer(2): 0.1154 miles per minute

71 minutes after starting the race, Kevin passed mile marker 9. To complete the race in 112 minutes, what must Kevin's average speed be as he travels from mile marker 9 to the finish line?

Total time 112 minute and already used 71 minutes.  

Time left=41 minutes

Total distance 13.1 and already traveled 9 miles

Total distance left = 4.1 miles

Average speed = Total distance left / Time left = 4.1 / 41 = 0.1 miles per minute

Answer(3): 0.1 miles per minute

You might be interested in
What type of pressure is transmitted by fluids
Evgesh-ka [11]
Cerebrospinal fluid or Hydrocephalus
5 0
3 years ago
A student wearing frictionless in-line skates on a horizontal surface is pushed, starting from rest, by a friend with a constant
grin007 [14]

Answer:

Physics

Explanation:

Explanation:

We can use the Theorem of Work (W) and Kinetic Energy (K):

W=ΔK=Kf−Ki

it basically tells us that the work done on our system will show up as change in Kinetic Energy:

We know that the initial Kinetic Energy, Ki=12mv2i, is zero (starting from rest) while the final will be equal to 352J; Work will be force time displacement. so we get:

F⋅d=Ff

45d=352

and so:

d=35245=7.8≈8m

8 0
2 years ago
Read 2 more answers
If a ping pong ball and a golf ball are both moving in the same direction with the same amount of kinetic energy, the speed of t
Liono4ka [1.6K]

If the kinetic energy of each ball is equal to that of the other,
then

(1/2) (mass of ppb) (speed of ppb)² = (1/2) (mass of gb) (speed of gb)²

Multiply each side by 2:

      (mass of ppb) (speed of ppb)² = (mass of gb) (speed of gb)²

Divide each side by (mass of gb) and by (speed of ppb)² :

     (mass of ppb)/(mass of gb)  =  (speed of gb)²/(speed of ppb)²

Take square root of each side:

       √ (ratio of their masses)  =  ( 1 / ratio of their speeds)²

By trying to do this perfectly rigorously and elegantly, I'm also
using up a lot of space and guaranteeing that nobody will be
able to follow what I have written.  Let's just come in from the
cold, and say it the clear, easy way:

If their kinetic energies are equal, then the product of each
mass and its speed² must be the same number.

If one ball has less mass than the other one, then the speed²
of the lighter one must be greater than the speed² of the heavier
one, in order to keep the products equal.

The pingpong ball is moving faster than the golf ball.

The directions of their motions are irrelevant.

5 0
3 years ago
A car moving at 60 mph slams on its brakes to stop before hitting a deer. Another identical car traveling at 60 mph slows to a s
ankoles [38]

Happy Holidays!

Recall that:

Impulse = Change in Momentum = mass × change in velocity

Since both cars are identical and have the same initial velocity of 60 mph, them breaking to a stop means that they both experience the same change in velocity.

Thus, both of the cars' impulses are equal.

8 0
2 years ago
A student measures the speed of a rolling ball three times. She adds the measurements and divides by 3. What quantity did the st
Lapatulllka [165]
They calculated the mean value
7 0
3 years ago
Read 2 more answers
Other questions:
  • You have just landed on Planet X. You release a 100-g ball from rest from a height of 10.0 m and measure that it takes 3.40 s to
    6·1 answer
  • A treasure map instructs you to walk (25.0+A) m south, followed by (18.0+B) m east, then 64.5 m north, and finally 28.5 m east.
    15·1 answer
  • calculate the displacement of a mouse walking along a ruler, if it begins at the location x=5cm, and then walks yo x=12cm
    7·1 answer
  • Which of the following is the best explanation of work?
    15·2 answers
  • How do you do this? I know that the Density equation is D=m/v but these are in kilograms and Liters...so do I convert it to gram
    14·1 answer
  • A uniform disk with radius 0.650 m
    5·1 answer
  • The sun is the centermost star of our solar system. <br> a. True <br> b. False
    11·2 answers
  • En una barra de 6m que se utiliza como palanca se coloca el fulcro a 2 m de distancia del extremo derecho, como se muestra en la
    13·1 answer
  • When an external magnetic flux through a conducting loop decreases in magnitude, a current is induced in the loop that creates i
    5·1 answer
  • An empty container has a mass of 3 g. When it is filled with 5 cm3 of a liquid,
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!