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]
3 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]3 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]3 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
RACTIC PTUDIES
Amanda [17]

Answer:

The illumination on the book before the lamp is moved is 9 times the illumination after the lamp is moved.

Explanation:

The distance of the book before the lamp is moved, d_{b} = 30 cm

The distance of the book after the lamp is moved, d_{a} = 90 cm

Illumination can be given by the formula, E = \frac{P}{4 \pi d^{2} }

Illumination before the lamp is moved, E_{b} = \frac{P}{4 \pi d_{b} ^{2} }

Illumination after the lamp is moved, E_{a} = \frac{P}{4 \pi d_{a} ^{2} }

\frac{E_{a}}{E_{b}} } = \frac{\frac{P}{4 \pi d_{a} ^{2} } }{\frac{P}{4 \pi d_{b} ^{2} } }

\frac{E_{a} }{E_{b} } = \frac{d_{b} ^{2} }{d_{a} ^{2}} \\\frac{E_{a} }{E_{b} } = \frac{30^{2} }{90 ^{2}}\\\frac{E_{a} }{E_{b} } =\frac{900 }{8100}\\\frac{E_{a} }{E_{b} } =\frac{1 }{9}

E_{b} = 9E_{a}

The illumination on the book before the lamp is moved is 9 times the illumination after the lamp is moved.

6 0
3 years ago
How did ALS impact Stephen Hawking?
olga nikolaevna [1]

Answer:

Professor Hawking had just turned 21 when he was diagnosed with a very rare slow-progressing form of ALS, a form of motor neurone disease (MND). He was at the end of his time at Oxford when he started to notice early signs of his disease. He was getting more clumsy and fell over several times without knowing why.

Explanation:

none

6 0
3 years ago
A piece of solid copper, at 10oC, is dropped into a graduated cylinder of 100°C water. Which statement BEST describes the change
enot [183]

Answer:

D

Explanation:

just took the test

6 0
3 years ago
Read 2 more answers
What is electrostatic repulsion?
Anton [14]
Electrostatic repulsion is the force between two charges having the same sign, that tends to separate them further. The force is proportional to the product of the charges, and inversely proportional to the square of the distance between them.
8 0
3 years ago
Read 2 more answers
Two planets have the same surface gravity, but planet b has twice the radius of planet
nevsk [136]
The formula for the acceleration due to gravity is:

a = Gm/r²
where
G is the universal gravitational constant = 6.6726 x 10⁻¹¹ N-m²/kg²
m is the mass of planet
r is the radius of planet

So, if they have the same a:

m₁/r₁² = m₂/r₂²
So, if m₁ = m and r₂ = 2r₁,
m/r₁² = m₂/(2r₁)²
m₂ = 4m

<em>Thus, the answer is D.</em>
8 0
3 years ago
Other questions:
  • How.many deaths occur from air pollution yearly
    12·1 answer
  • Give an example of a situation in which you would describe an object's position in
    9·1 answer
  • What kind of variation is there in the mechanical energy as the cart rolls down the ramp? Does this agree with your prediction?
    15·1 answer
  • Question 1 of 15
    7·1 answer
  • The force exerted on a bridge pier in a river is to be tested in a 1:10 scale model using water as the working fluid. In the pro
    14·1 answer
  • A dog on a skateboard applies a force of 84 N. He accelerates at 3.7 m/s2 and there is a friction force of 33 N. What is the dog
    5·1 answer
  • Camera flashes charge a capacitor to high voltage by switching the current through an inductor on and off rapidly. In what time
    6·1 answer
  • A water balloon is thrown at 20 m/s from the top of a 20 m high building, what is its speed when it hits the ground? Does the an
    5·1 answer
  • A car with a velocity of 30 mph
    11·1 answer
  • Help mee pleaseee :)))
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!