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
dedylja [7]
3 years ago
13

A typical value for the coefficent of quadratic air resistance on a cyclist is around c=0.20 N/m(m/s)2. Assuming thath the total

mass (cyclist plust cycle) is m = 80 kg and that at t = 0 the cyclist has an intial speed v=20m/s (abouit 45 mi/h) and starts to coast to a stop under the influence of air resistance, find the characteristic time τ=m/cvo. How long will it take him to slow to 15 m/s? What about 10 m/s? And 5 m/s? (Below about 5 m/s, it is certainly not reasonable to ignore friction, so there is no point pursuing this calculation to lower speeds.)
Physics
1 answer:
lesantik [10]3 years ago
5 0

Answer:

Characteristic time τ=20 s

When V = 15 m/s

t = 6.66 s

When V = 10 m/s

t = 20 s

When V = 5 m/s

t = 60 s

Explanation:

Given that

c=0.20 N/m(m/s)2

m = 80 kg

Vo=20m/s

Characteristic time τ=m/cvo.

\tau =\dfrac{m}{c.V_o}

\tau =\dfrac{80}{0.2\times 20}

Characteristic time τ=20 s

We know that velocity after t time given as follows

V =\dfrac{V_o}{1+\dfrac{\tau}{t}}

When V = 15 m/s

15 =\dfrac{20}{1+\dfrac{20}{t}}

t = 6.66 s

When V = 10 m/s

10 =\dfrac{20}{1+\dfrac{20}{t}}

t = 20 s

When V = 5 m/s

5 =\dfrac{20}{1+\dfrac{20}{t}}

t = 60 s

You might be interested in
Rogue waves are created along the "Wild Coast" off the southeast coast of ________, where the Agulhas Current flows directly aga
Vedmedyk [2.9K]

Answer:

Africa

Explanation:

A rogue wave refers to the wave that is twice the height of a significant wave occurring in a particular area. The significant wave height is generally referred to as the mean of the largest one-third of waves existing at a particular time period. In simple words, a rogue wave is much larger than any other waves that occur at the proximity of the same time.

This rough wave describes the interaction between the ocean and sea current and swelling of waves. It takes place when the large swells in the ocean, also known as the Antarctic storms, strikes with the rapidly traveling Agulhas current, and the curved water current focuses on the energy of the waves.

Thus, these Rogue waves are often generated along the southeastern coastal regions of Africa, where there occurs the convergence of Antarctic storm waves and Agulhas Current.

4 0
3 years ago
A motorcycle is speeding along at a velocity of120kph.Then, it changes to a velocity of 150 kph for 2 minutes.What is the motorc
Taya2010 [7]

Answer:

Explanation:

a=v-u/t

a=acceleration

v=final velocity

u=initial velocity

t=tme taken

we need to convert from kph to ms⁻¹

v= 150*1000/60*60= 41.67ms⁻¹

u= 120*1000/60*60= 33.33ms⁻¹

t= 2*60= 120s

a=41.67-33.33/120

a=8.34/120

a=0.0694ms⁻²

8 0
3 years ago
How long will it take for a boat traveling at 36 k/h to go 126 km?
brilliants [131]
3 hours 30 min i believe because 126/36 is 3.5 and 3.5 hours is 3 hours and 30 min. Brainliest pls
5 0
3 years ago
What is includeed in a cover sheet
Oksana_A [137]
Are you referring to try to get into a college? if you are here is a basic outlay...

Your Street Address
City, State, Zip Code

Date

Name of Person, Title
Company/Organization
Street Address
City, State, Zip Code

Dear Mr./Ms./Dr.     :

Introduction: State your reason for writing. Name the specific position or type of work for which you are applying. (Mention how you heard about the opening, if appropriate.)

Body: Explain why you are interested in working for that employer, or in that field of work, and what your qualifications are. Highlight two to three achievements that relate to the position and field. Refer the reader to the enclosed resume, application, and/or portfolio.

Closing: Thank the reader for his or her time and consideration. Indicate your desire for an interview and provide your contact information. If the employer is willing to accept phone calls, state that you will call to discuss the possibility of scheduling an interview.

Sincerely,

Your Name
<span>Enclosure / Attachment
</span>
4 0
3 years ago
Please help ASAP guys !!! Thanks
andreev551 [17]

Answer:

(a) gravitational potential energy converted to kinetic energy

(b) chemical energy is converted to light or heat energy

(c) mechanical energy is converted into kinetic energy

7 0
2 years ago
Other questions:
  • You are given the speed of a wave and it's period. What kind of information can you also find out about this wave?
    14·1 answer
  • ) a box weighing 77.0 n rests on a table. a rope tied to the box runs vertically upward over a pulley and a weight is hung from
    13·1 answer
  • At what speed do a bicycle and its rider, with a combined mass of 100 kg, have the same momentum as a 1400 kg car traveling at 6
    10·1 answer
  • Taking force , length and time as fundamental quantity , find the dimensional formula for density​
    11·1 answer
  • The city of San Francisco reported more missing dogs the week before a massive earthquake than any other week of the year. There
    5·2 answers
  • You have two points in a soil. Point A is at 75 cm; point B is at 25 cm above the reference. The capillary potential energy at p
    6·1 answer
  • Singing that is off-pitch by more than about 1% sounds bad. How fast would a singer have to be moving relative to the rest of a
    11·1 answer
  • How would you change the distance between two charged particles to increase the electric force between them by a factor of 16
    15·2 answers
  • I need help with these questions
    8·1 answer
  • - Explain why an aircraft will tend to lose height
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!