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3 years ago

A rocket is launched from rest with a constant upwards acceleration of 18 m/s2. Determine its velocity after 25 seconds

Engineering

1 answer:

lisabon 2012 [21]3 years ago

5 0

Answer:

The final velocity of the rocket is 450 m/s.

Explanation:

Given;

initial velocity of the rocket, u = 0

constant upward acceleration of the rocket, a = 18 m/s²

time of motion of the rocket, t = 25 s

The final velocity of the rocket is calculated with the following kinematic equation;

v = u + at

where;

v is the final velocity of the rocket after 25 s

Substitute the given values in the equation above;

v = 0 + 18 x 25

v = 450 m/s

Therefore, the final velocity of the rocket is 450 m/s.

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A certain working substance receives 100 Btu reversibly as heat at a temperature of 1000℉ from an energy source at 3600°R. Refer

Valentin [98]

Answer:

Explanation:

t1 = 1000 F = 1460 R

t0 = 80 F = 540 R

T2 = 3600 R

The working substance has an available energy in reference to the 80F source of:

B1 = Q1 * (1 - T0 / T1)

B1 = 100 * (1 - 540 / 1460) = 63 BTU

The available energy of the heat from the heat wource at 3600 R is

B2 = Q1 * (1 - T0 / T2)

B2 = 100 * (1 - 540 / 3600) = 85 BTU

The reduction of available energy between the source and the 1460 R temperature is:

B3 = B2 - B1 = 85 - 63 = 22 BTU

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3 years ago

Match each term in the second column with its correct definition in the first column.

Levart [38]

Answer:

The filled in the black answers is:

1. work book

2. Spreadsheet

3. Cell

4. Sheet tabs

5. Column

6. Row

7.Cell content

8. data

9. Formula

10. Constant value

11. Number value

12. Cell address

7 0

3 years ago

The animation shows the circuit inside a speaker. The speaker cone vibrates as the current changes direction. This creates sound

I am Lyosha [343]

Answer:

The direction of the magnetic field around the coil reverses. The force on the cone now pulls it back in. Repeatedly alternating the current direction makes the cone vibrate in and out. The cone vibrations cause pressure variations in the air, which are sound waves.

Explanation:So as it goes back and forth it makes a sound from the vibration.

5 0

4 years ago

Write a Person class with a constructor that accepts the following details:

Liono4ka [1.6K]

The person class is an illustration of constructors;

In computer programs, constructors are automatically called when the object of a class is created

<h3>The program in C++</h3>

The class and the constructor program written in C++ programming language is as follows:

int main(){

string fname, lname,dob,idno,mobileno;

cin>>lname; cin>>fname; cin>>dob; cin>>idno; cin>>mobileno;

Person c(fname,lname,dob,idno,mobileno);

if(mobileno.length() == 12){

if(mobileno[3] == '-' && mobileno[7] == '-'){

cout << "Name: " << c.getfname() << " " << c.getlname() << endl

<< "Date of birth: " << c.getdob() << endl

<< "ID number: " << c.getid() << endl

<< "Mobile: " << c.getmobile() << endl

<< "Age: "<< getAge(dob)<<endl;

;

}

The complete program is added as an attachment

Read more about C++ programs at:

brainly.com/question/13168905

#SPJ1

Download cpp

3 0

2 years ago

. For each of the following situations, determine if the diode below is in foward or reversebias(a) (2 points) V1 = 0 V, V2= 2V(

Mazyrski [523]

Assuming V1 is the anode and v2 the cathode (Anode is P region and Cathode is N)

Answer:

a) Reverse bias

b) Forward bias

c) Forward bias

Explanation:

Forward bias: It happens whenever the N region of the diode is more positive than the P region. Hence, the depletion zone increase ceasing the current through the circuit -> V1 -V2 < 0

Reverse bias: It happens whenever the P region of the diode is more positive than the N region. In this case, the depletion zone begins to shrink, if enough voltage is applied current could go through the circuit -> V1 - V2 > 0

a) V = V1 - V2 = 0 - 2 = -2 -> -2 is smaller than zero therefore, we have reverse bias

b) V = V1 - V2 = 4.5 - 2.8 = 1.7 -> 1.7 is greater than zero therefore, we have forward bias

c9 V = V1 - V2 = -1 - -1.3 = 0.3 -> 0.3 is greater than zero therefore, we have forward bias

6 0

3 years ago