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
Alekssandra [29.7K]
3 years ago
6

If the sprinter from the previous problem accelerates at that rate for 20 m, and then maintains that velocity for the remainder

of the 100-m dash, what will be his time for the race?
Physics
1 answer:
kakasveta [241]3 years ago
5 0

Question:

A 63.0 kg sprinter starts a race with an acceleration of 4.20m/s square. What is the net external force on him? If the sprinter from the previous problem accelerates at that rate for 20m, and then maintains that velocity for the remainder for the 100-m dash, what will be his time for the race?

Answer:

Time for the race will be t = 9.26 s

Explanation:

Given data:

As the sprinter starts the race so initial velocity = v₁ = 0

Distance = s₁ = 20 m

Acceleration = a = 4.20 ms⁻²

Distance = s₂ = 100 m

We first need to find the final velocity (v₂) of sprinter at the end of the first 20 meters.

Using 3rd equation of motion

(v₂)² - (v₁)² = 2as₁ = 2(4.2)(20)

v₂ = 12.96 ms⁻¹

Time for 20 m distance = t₁ = (v₂ - v ₁)/a

t₁ = 12.96/4.2 = 3.09 s

He ran the rest of the race at this velocity (12.96 m/s). Since has had already covered 20 meters, he has to cover 80 meters more to complete the 100 meter dash. So the time required to cover the 80 meters will be

Time for 100 m distance = t₂ = s₂/v₂

t₂ = 80/12.96 = 6.17 s

Total time = T = t₁ + t₂ = 3.09 + 6.17 = 9.26 s

T = 9.26 s

You might be interested in
Saatlemati
vodomira [7]

Answer:

what are u asking there isnt a question

3 0
3 years ago
Three-Dimensional Thinking
gavmur [86]

Answer:

A.

Explanation: both triple by 3

4 0
2 years ago
What is a positive impact of artificial fertilizers
dybincka [34]
<span>The top benefit of pesticides is their effectiveness against pests that would otherwise decimate crops large and small. </span>
5 0
3 years ago
An electron is brought from rest infinitely far away to rest at point P located at a distance of 0.041 m from a fixed charge q.
torisob [31]

Answer:

The electric potential in volts is 1.618 x 10⁻¹⁷ V

Explanation:

The electric potential, in volts, at point P, can be calculated as follow;

Electric potential is the work done in moving a unit positive charge from infinity to a particular point in the electric field.

Thus, the work done in this process in moving the charge to point p is 101eV.

Convert this Volts = 101 × 1.602 x 10⁻¹⁹ V

                              = 1.618 x 10⁻¹⁷ V

Therefore, the electric potential in volts is 1.618 x 10⁻¹⁷ V

3 0
3 years ago
A large uniform chain is hanging from the ceiling, supporting a block of mass 46 kg. The mass of the chain itself is 19 kg, and
docker41 [41]

Answer:

T = 451.26 N

Explanation:

It is given that,

The mass of block, m = 46 kg

Mass of the chain, m' = 19 kg

Length of the chain, l = 1.9 m

Let T is the the tension in the chain at the point where the chain is supporting the block. It is clearly equal to the product of mass and acceleration.

T=mg

T=46\ kg\times 9.81\ m/s^2

T = 451.26 N

So, the tension in the chain at the point where the chain is supporting the block is 451.26 N. Hence, this is the required solution.

4 0
3 years ago
Other questions:
  • How does a convex mirror form an image?
    11·2 answers
  • An aluminum wire with a diameter of 0.115 mm has a uniform electric field of 0.235 V/m imposed along its entire length. The temp
    13·2 answers
  • The resistance and the magnitude of the current depend on the path that the current takes. The drawing shows three situations in
    15·2 answers
  • The average gorilla can travel 40.23 meters in 4 seconds, calculate the average speed in meters per second (m/s) 
    13·2 answers
  • The jumping gait of the kangaroo is efficient because energy is stored in the stretch of stout tendons in the legs; the kangaroo
    15·1 answer
  • Yuck! This statement represents which of the folllwoing functions of language
    7·1 answer
  • CAN ANY KNE DO YHIS I WILL DIE <br> PLEASE I MEES HE ASAP
    15·1 answer
  • Which among the following statements is correct?
    8·2 answers
  • How does a dry cell produce electricity​
    12·1 answer
  • The momentum of a 3000 kg truck is 6.36 x 104 kg·m/s. At what speed is the truck traveling? m/s
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!