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3 years ago

13

One of the disadvantages of the test of the hypothesis is that the final decision cannot be said to be completely correct eviden

ce or explained with full certainty.a. Trueb. False

1 answer:

vfiekz [6]3 years ago

4 0

Answer:

A. True

Explanation:

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Write a modular program that finds the equation, area, and circumference of a circle, given the coordinates of the center of the

Semenov [28]

Answer:

Explanation:

#include <bits/stdc++.h>

#include <iostream>

#include <string>

#include <cmath>

using namespace std;

//this function reads the cooridnates of Center from the user

//parameteres are pointer variables of Cx,Cy

//it does not return anything and stores coordinates at given addresses of Cx,Cy

void readCenter(int *Cx,int *Cy)

{

string cooridnates;

cout << "Enter the x and y cooridnates of the centre of the circle separated by comma: " ;

getline(cin,cooridnates);//reading inputs

//convering string ot integer

string x = cooridnates.substr(0, cooridnates.find(","));

string y = cooridnates.substr(cooridnates.find(",")+1);

*Cx=stoi(x);

*Cy=stoi(y);

}

//this function reads the cooridnates of Point from the user

//parameteres are pointer variables of Px,Py

//it does not return anything and stores coordinates at given addresses of Px,Py

void readPoint(int *Px,int *Py)

{

string cooridnates;

cout << "Enter the x and y cooridnates of a point on the circle separated by comma: " ;

getline(cin,cooridnates);//reading inputs

//convering string ot integer

string x = cooridnates.substr(0, cooridnates.find(","));

string y = cooridnates.substr(cooridnates.find(",")+1);

*Px=stoi(x);

*Py=stoi(y);

}

double findArea(double radius)

{

double pi=acos(-1);

return pi*pow(radius,2);

}

double findCircum(double radius)

{

double pi=acos(-1);

return 2*pi*radius;

}

int main()

{

int Cx,Cy;

int Px,Py;

readCenter(&Px,&Py);

readPoint(&Cx,&Cy);

double radius=sqrt(pow((Px-Cx),2)+pow((Py-Cy),2));

cout<<"The circle has an area of "<<findArea(radius)<<" sqaure units\n";

cout<<"The circle has a Circumference of "<<findCircum(radius)<<" units";

return 0;

}

3 0

3 years ago

(1) Estimate the specific volume in cm3 /g for carbon dioxide at 310 K and (a) 8 bar (b) 75 bar by the virial equation and compa

ludmilkaskok [199]

Answer:

70.66 cm^3

The specific volume for P = 70.66 is within 1% of the experimental value while the viral equation will be inaccurate when the second viral coefficient is used )

Explanation:

Viral equation : Z = 1 + Bp + Cp^2 + Dp^3 + -----

Viral equation can also be rewritten as :

Z = 1 + B ( P/RT )

B ( function of time )

Temperature = 310 K

P1 = 8 bar

P2 = 75 bar

<u>Determine the specific volume in cm^3 </u>

V = 70.66 cm^3

<u>b) comparing the specific volumes to the experimental values </u>

70.58 and 3.90

The specific volume for P = 70.66 is within 1% of the experimental value while the viral equation will be inaccurate when the second viral coefficient is used )

attached below is the detailed solution

3 0

2 years ago

3. (9 points) A square-thread power screw is used to raise or lower the basketball board in a gym, the weight of which is W = 10

Bezzdna [24]

Answer:

a) 49.95 watts

b) The self locking condition is satisfied

Explanation:

Given data

weight of the square-thread power screw ( w ) = 100 kg = 1000 N

diameter (d) = 20 mm ,

pitch (p) = 2 mm

friction coefficient of steel parts ( f ) = 0.1

Gravity constant ( g ) = 10 N/kg

Rotation of electric power screwdrivers = 300 rpm

A ) Determine the power needed to raise to the basket board

first we have to calculate T

T = Wtan (∝ + Ф ) * $\frac{Dm}{2}$ ------------- equation 1

Dm = d - 0.5 ( 2) = 19mm

Tan ∝ = $\frac{L}{\pi Dm}$ where L = 2*2 = 4

hence ∝ = 3.83⁰

given f = 0.1 , Tan Ф = 0.1. hence Ф = 5.71⁰

insert all the values into equation 1

T = 1.59 Nm

Determine the power needed using this equation

$\frac{2\pi NT }{60}$ = $\frac{2\pi * 300 * 1.59}{60}$

= 49.95 watts

B) checking if the self-locking condition of the power screw is satisfied

Ф > ∝ hence it is self locking condition is satisfied

3 0

3 years ago

The density of a certain type of steel is 8.1 g/cm3. What is the mass of a 100 cm3 chunk of this steel

irina1246 [14]

Answer:

810 g

Explanation:

Mass is the product of density and volume:

m = ρV

m = (8.1 g/cm³)(100 cm³) = 810 g

The mass of the chunk is 810 grams.

4 0

2 years ago

What is the answer of this question please tell me <br><br>dadada please please

charle [14.2K]

lol i neeeeeeeeeeeeeeeeeeeeeeeed pointssssssssssssssss

6 0

3 years ago