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
sukhopar [10]
3 years ago
9

A sky diver with a mass of 70 kg jumps from an aircraft. The aerodynamic drag force acting on the sky diver is known to be FD =k

V2, where k = 0.25 N*s^2 / m^2.
a. Determine the maximum speed of free fall for the sky diver and the speed reached after 100 m of fall.
b. Plot the speed of the sky diver as a function of time and as a function of distance fallen.

Engineering
1 answer:
lions [1.4K]3 years ago
6 0

Answer:

The correct answer is

The maximum speed of free fall for the sky diver is 52.41 m/s

and the speed reached after 100 m is 37.44 m/s

Explanation:

From Force = mass × acceleration

Aerodynamic drag force = FD = k·V², where k = 0.25 N·s²/m²

The maximum speed, v, of free fall where m·a = 0 at terminal velocity

Mass × Gravity - Aerodynamic drag force = ma = 0

∴ 70 kg × 9.81 m/s² - 0.25 N·s²/m²× v² =0

Therefore v = 52.41 m/s

The speed after 100 m of free fall is given by

V = \sqrt{\frac{m*g}{k} (1 - e^{(\frac{2k}{m} (y-y_{0} ))} }  

Substituting we have, where y - y₀ = 100 then v = 37.44 m/s

b) To plot the relation we have

Speed to time relation as v or s(t) = \sqrt{\frac{m*g}{k} (1 - e^{(-\frac{k}{m} t)} }

Where S(t) is he speed at time t

and the relation between time and distance = v × t

Please see the attached graphs

You might be interested in
Q.13 In order to produce maximum starting torque in a split-phase motor, how many degrees out of phase should the start- and run
Phantasy [73]

Answer:

D. 90 degrees.

Explanation:

Torque is a rotational force which moves an object in other direction. There should be 90 degrees out of phase to start, run winding currents with each other. Torque is produced by the rotational motion of an object. The angle of the object must be 90 degrees set in order to create torque.

3 0
3 years ago
________ are written to “maximize” or “minimize” a specific value associated with the product needs in order to define the goal
Anna35 [415]

Answer:

Objective statements.

Explanation:

An objective statement can be defined as a short statement that explicitly states or describes what a person wants exactly or is looking out for in a particular item.

Objective statements are written to “maximize” or “minimize” a specific value associated with the product needs in order to define the goal or aim of the design process.

This ultimately implies that, objective statements are used by various manufacturing industries or companies to explicitly define the minimum or maximum requirements for the production of its goods.

4 0
3 years ago
Read 2 more answers
Some designers suggest that speech recognition should be used in a telephone menu system. This would allow users to interact wit
Ghella [55]

The designers suggest that speech recognition allows for spoken interaction or conversation and spoken prompts or commands.

Explanation:

The speech recognition is used when the user has physical impairments and hands are busy, eyes are occupied and the user cannot read.

We can save time with the usage of speech recognition system. The users are knowledgeable based on the actions available.

The problems faced in speech recognition system are in the noisy environment it has bad microphones and the commands should be learned and remembered.

The other obstacle is error correction is time consuming. the speech production has slow space to speech output provides privacy in public spaces. The disadvantage is it contains large amount of information.

5 0
4 years ago
Explain all the characteristics of computer<br>​
Sedaia [141]
They are as follows-

Speed
Accuracy
Storage
Versatility
Diligence
Automation
Reliability
Power of Remembering

Let us understand each characteristic in brief:-

Speed – Speed of a computer means the time it takes to complete any given task. The computer works at a very lightning speed. For example, a computer takes a second to calculate 3 million calculations rather than a human which takes years. Hence nowadays the speed of the computer is measured in terms of microseconds, Nanoseconds, and even in Pico seconds instead of seconds or milliseconds.


Accuracy – The computers are programmed and designed in such a manner that their results are almost 100% accurate. It performs all the tasks with the same accuracy. There are very few chances of uncertainty in results and even though an error occurs, it can happen either due to wrong input data or unreliable programs by a programmer. Such errors are referred to as Garbage In Garbage Out (GIGO) which means, if you provide wrong instructions to the computer then you get wrong results.


Versatility – Along with being accurate and diligent a computer is also a versatile device. It can perform several types of tasks at a time if they are reduced to a certain set of logical steps. A computer can be used for many purposes at different places such as booking air and rail tickets, weather forecasting, listening to music, and playing games. Also at a time, one can pay his utility bills and can make a monthly budget too. It can prepare documents, data sheets and also can make models of houses, dams, etc.
Diligence – The ability of a computer to perform tasks without getting tired is known as diligence. Computers are highly reliable, they do not get fed up, exhausted, or lack concentration. They can work for hours and hours unlike humans and can give accurate or error-free results. For example, humans will start feeling tired after 2 -3 hours and will lack concentration whereas a computer will keep on working until the results are achieved.
Automation – Automation means working automatically. A computer can work on its own without the intervention of the person using it. Programs can be made for the computer to perform the task and based on the sequence it executes the tasks and gives accurate results. In case an error occurs, it gives error messages too and registers the logs.
Reliability – High reliability of a computer depends on low failure rate and easy maintenance. The results given out by the computer are reliable as the accuracy is almost 100%.
Power of Remembering – The computer has the power of storing data or information for several years. It cannot lose the data on its own. A person can retrieve the data whenever required and the data remains the same after a number of years also. It gives the freedom to the user to decide on how much data to store and how much to remove.
5 0
3 years ago
How to cancel account
Anestetic [448]
You have to delete the app or delete your account
7 0
3 years ago
Other questions:
  • For each of the following stacking sequences found in FCC metals, cite the type of planar defect that exists:
    7·1 answer
  • a metal coin has certain properties that can be measured.which property of a coin is different on the moon that is on earth?
    6·1 answer
  • The in situ moist unit weight of a soil is 17.3 kN/m3 and the moisture content is 16%. The specific gravity of soil solids is 2.
    12·1 answer
  • write an interface downloadable that has a method "geturl" that returns the url of a downloadable object
    5·1 answer
  • What energy type is represented in the picture?
    6·2 answers
  • 1. Two aluminium strips and a steel strip are to be bonded together to form a composite bar. The modulus of elasticity of steel
    11·1 answer
  • Construction lines are thick lines true false
    11·2 answers
  • Which of the following statements are true.
    14·1 answer
  • Global climate and weather patterns are driven by differences in the amount of heat energy in different areas of the earth. Whic
    9·1 answer
  • Which sentence with an introductory phrase is punctuated correctly?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!