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
statuscvo [17]
3 years ago
8

Using energy considerations, calculate the average force (in N) a 67.0 kg sprinter exerts backward on the track to accelerate fr

om 2.00 to 8.00 m/s in a distance of 25.0 m, if he encounters a headwind that exerts an average force of 30.0 N against him.

Physics
2 answers:
Illusion [34]3 years ago
7 0

Answer:

F_{sprinter}=110.4N

Explanation:

Given data

Mass m=67.0 kg

Final Speed vf=8.00 m/s

Initial Speed vi=2.00 m/s

Distance d=25.0 m

Force F=30.0 N

From work-energy theorem we know that the work done equals the change in kinetic energy

W=ΔK=Kf-Ki=1/2mvf²-1/2mvi²

And

W=F_{total}.d

So

W=1/2mv_{f}^2-1/2mv_{i}^2\\F_{total}=\frac{1/2mv_{f}^2-1/2mv_{i}^2}{d} \\F_{total}=\frac{1/2(67.0kg)(8.00m/s)^2-1/2(67.0kg)(2.00m/s)^2}{25.0m} \\F_{total}=80.4N

and we know that the force the sprinter exerted Fsprinter the force of the headwind Fwind=30.0N

So

F_{sprinter}=F_{total}+F_{wind}\\F_{sprinter}=80.4N+30N\\F_{sprinter}=110.4N  

dsp733 years ago
5 0

Explanation:

Below is an attachment containing the solution.

You might be interested in
II. IDENTIFY THE TYPE OF FORCE
uysha [10]

Answer:

Explanation:

1. Frictional force is responsible for running of car and buses on roads.

2.Gravitational force exists between astronauts in space.

3. Magnetic for is responsible to attract the iron objects using a magnet

4.Electrostatic force is responsible for fiber to stick on the skin.This force occurs due to the presence of charge.

5.When a person is pushing a trolley then object experience a normal reaction from ground.

6.Gravitational force makes the planet to move in their orbits.

4 0
3 years ago
What happens in the crushing can experiment?
Dafna1 [17]

Explanation:

When hot water is poured on the can in a bucket of cold water, the can crushes off means it gets unshaped

7 0
3 years ago
An atom that has an excess positive or negative electrical charge caused by the loss or addition of an electron is called a(n)
maria [59]

Answer:

ion

Explanation:

4 0
3 years ago
Read 2 more answers
How do magnetic trains work and what advantages do they have compared to regular trains
ad-work [718]

Answer:

magnetic trains works at the principle of repel on of the advantage is that they are fast and dont really need diesel

7 0
3 years ago
A boat with a horizontal tow rope pulls a waterskier. She skis off to the side, the rope makes an angle of 15° with the forward
dsp73

Answer:

<h3>13,976.23Joules</h3>

Explanation:

Workdone by the rope is expressed using the formula;

W = Fd sin(theta)

F is the tension in the rope = 180

d is the displacement = 300m

theta is the angle of inclination = 15°

Substitute the given parameters into the formula;

W = 180(300)sin15

W = 54000sin 15

W = 13,976.23

Hence the workdone by the rope is 13,976.23Joules

4 0
2 years ago
Other questions:
  • A scientist finds a new life form. The life form is 2 meters tall. It makes its own food. It has tubes that carry food and water
    7·1 answer
  • A sphere mass m1 and a block of mass m2 are connected by a light cord that passes over a pulley. The radius of the pulley is R,
    12·1 answer
  • If the wavelength of orange light is 6 · 10-7 m, calculate its frequency. f = _______ Hz
    14·1 answer
  • What happens when you stroke the prongs with the wire?
    6·1 answer
  • If the strings have the same thickness butdifferent lengths, which of the following parameters, if any, willbe different in the
    15·1 answer
  • What is a substance
    5·2 answers
  • A plane has a mass of 2,000 kg and is traveling 100 meters above the ground. What is the plane’s potential energy?
    5·1 answer
  • Fill in the blank. When using a wrench if you double the length of the wrench (effort arm), you have ______ the required force t
    11·1 answer
  • What form of energy is released into the atmosphere by the earth's surface
    12·2 answers
  • Where can radiation be found in nature and how is it affected
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!