Answers by visitors named: Oscar
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Step 4: Next, consider the change in voltage that would be required to obtain the desired motor speed. This can not be determined precisely at this time because the relationship S(V) between speed and voltage is non-linear. However, we might use the approximation
which can be solved for the next value giving
I will rewrite the above equation using the terminology “previous value” representing the index n-1, “current value” representing the index n, and “next value” representing the index n+1.
Equation A1
If this equation is used directly, there can be instabilities in which, given a motor speed well below the desired speed, the change in voltage leads to a motor speed well above the desired speed, leading to a new change in voltage and a motor speed again well below the desired speed. For this reason, rather than trying to hit the desired speed in a single step, one “slowly walks toward” the desired speed by using changes in voltage smaller than the above. The FINAL (yes, you can breath a sign of relief) equation for control typically used is therefore,
Equation A2
You need to experiment with an appropriate value of lambda but you may want to try something link . Smaller values will cause the speed to increase more slowly towards the desired value. Larger values may cause instability (speed never converging to desired value).
For the program to be written, we will assume that the function giving the motor speed as a function of voltage is given by
Equation B
PROGRAMMING PROBLEM
The programming problem involves writing a program to implement equation A above in order to proceed through a sequence of voltage steps to give a desired motor speed (select the desired speed to be in the range between 1.5 and 8.5). Given the previous and current values of the voltage, equation A gives the next value of voltage. Equation B is used to calculate the motor speed for each value of voltage. The program will be in the form of a repeating loop which continues to adjust the voltage until the desired speed is achieved (to some specified accuracy). As an example of a specified accuracy, you will exit the loop when the measured speed differs from the desired speed by some small percentage. This can be stated mathematically as
Equation C
I will provide an outline of a possible program. You can make adjustments as appropriate. I have not provided the entire program details, just an outline. To implement the loop that increments (or decrements) the voltage until the desired speed is obtain, I have used a “do-while” loop. Other types of loops are also fine.
#include <...> // as needed
using namespace std;
int main()
{
float declare date types as needed;
char done(‘n’); // this is used to terminate loop.
char dummy; // See whether you understand why I use this below.
cout << “Enter desired motor speed between 1.5 and 8.5 “;
cin >> variable you are using for the desired value;
cout << endl << “Enter accuracy of motor speed desired (in %);
cin >> variable you use for “Accuracy” in equation C;
cout << endl << “Enter starting value for voltage “”
cin >> variable you are using for “previous” voltage;
cout << endl << “Enter value of voltage increment for start;
Previous speed = Use equation B with previous voltage;
current voltage = previous voltage + starting voltage increment;
Current speed = Use equation B with current voltage;
/* The above instructions set up the previous and current
values of voltage and speed that will be used in the loop
to calculate the next voltage and speed.
The next instruction gives heading for data printed
*/
do
{
Using equation A1 and A2, calculate the “next” voltage;
Using equation B and “next” voltage, calculate the “next” speed
cout << endl << value of “next voltage” << value of “next speed”
<< value of “desired speed;
cin >> dummy;
/* The “cout” instruction above prints out the values so that you
can see how your program is working towards obtaining the
correct speed by adjusting voltages. The “cin” instruction
causes the program to stop (so you can look at the values) until
you enter anything (including a carriage return).
The next four instructions do the following:
1. Set the “previous” values for the next pass through the
loop equal to the “current” values.
2. Set the “current” values for the next pass through the
loop equal to the “next” values calculated during this
pass through the loop. Make sure you understand why this
is done.
*/
Set “previous voltage” equal to “current voltage”;
Set “previous speed” equal to “current speed”;
Set “current voltage” equal to “next voltage”;
Set “current speed” equal to “next speed”;
Calculate the error in the speed and determine whether the
desired speed has been found, to within specified accuracy.
If desired speed has been found, set variable “done” equal to
the character ‘y’, i.e. done = ‘y’.
} while(done != ‘y’);
cout << endl << “Congrats. “;
return 0;
}
#include <...> // as needed
using namespace std;
int main()
{
float declare date types as needed;
char done(‘n’); // this is used to terminate loop.
char dummy; // See whether you understand why I use this below.
cout << “Enter desired motor speed between 1.5 and 8.5 “;
cin >> variable you are using for the desired value;
cout << endl << “Enter accuracy of motor speed desired (in %);
cin >> variable you use for “Accuracy” in equation C;
cout << endl << “Enter starting value for voltage “”
cin >> variable you are using for “previous” voltage;
cout << endl << “Enter value of voltage increment for start;
Previous speed = Use equation B with previous voltage;
current voltage = previous voltage + starting voltage increment;
Current speed = Use equation B with current voltage;
/* The above instructions set up the previous and current
values of voltage and speed that will be used in the loop
to calculate the next voltage and speed.
The next instruction gives heading for data printed
*/
do
{
Using equation A1 and A2, calculate the “next” voltage;
Using equation B and “next” voltage, calculate the “next” speed
cout << endl << value of “next voltage” << value of “next speed”
<< value of “desired speed;
cin >> dummy;
/* The “cout” instruction above prints out the values so that you
can see how your program is working towards obtaining the
correct speed by adjusting voltages. The “cin” instruction
causes the program to stop (so you can look at the values) until
you enter anything (including a carriage return).
The next four instructions do the following:
1. Set the “previous” values for the next pass through the
loop equal to the “current” values.
2. Set the “current” values for the next pass through the
loop equal to the “next” values calculated during this
pass through the loop. Make sure you understand why this
is done.
*/
Set “previous voltage” equal to “current voltage”;
Set “previous speed” equal to “current speed”;
Set “current voltage” equal to “next voltage”;
Set “current speed” equal to “next speed”;
Calculate the error in the speed and determine whether the
desired speed has been found, to within specified accuracy.
If desired speed has been found, set variable “done” equal to
the character ‘y’, i.e. done = ‘y’.
} while(done != ‘y’);
cout << endl << “Congrats. “;
return 0;
}
I'm not getting the correct answer this way. Maybe I'm doing something wrong.
54/.1 = 540
no...divide 25 by .33 and you'll get 75.75757575 however, .333333333 is 1/3 and 25 is 1/3 of 75
I need to find the formula for the speed when the spaceship is very far from the earth.
Thanks...I figured out part b
Thanks Bob. However, I had already tried 1/2mv^2-GMm/R before posting this and it came back as wrong. I'm not sure why it is wrong.
The Specific heat of a substance is the energy (joules) required to raise one gram of substance by one degree celsius (units J/g °C).
Heating 225.0 cm3 of a solid from 36.1 °C to 74.3 °c takes 35850 J of energy. The density of the solid at 36.1 °C is 1.75 g/cm3.
What is the Specific Heat of the solid in this experiment
Sorry didn't realise I was on answer ment to post as a new questions.
Thaks would you be able to show me an examples, as I still don't quite understand it. Sorry but this is my first time doing chemistry.
Thank you Bob
(1/1.65) x .13 + (.65/1.65) x .08 x .65
= .099273
= 9.93%
B. 11400 years
I'm asking for answers
I have to do this with only variables...
But isn't the bullet going up ? I'm so confused on how to write this with variables... So Dy = T x-9.8?
I know that ss the bullet passes through the air, it will arc down due to gravity. If the monkey held the branch, and the hunter was far enough away, the bullet might pass beneath him, but because the monkey is falling while the bullet is travelling, he's going to get shot.... But how do I show this with algebra?
And thank you so much for taking the time to help me.
Bullets horizontal displacement is Dx = (VoCos0)((VoSin0/9.8m/s^2x)2)
I'm not sure how to fund the y position of the byllet is exactly the original height of the monkey - how fat it fell..?
The bullet must go horizontally a distance, Dx, so Dx = Vh / t or t = Vh / Dx = VcosA / D and
Vup = VsinA + gt .... or t = (Vup -VsinA) /g .... sub
VcosA /D = (Vup -VsinA) /g .... V = D(Vup -VsinA)(g cosA)
Are nitrogen which are converted 2 protein synthesis.
the vector is indeed <2,2>, but the line angle (angle formed by y=1/2x and x-axis) is as Damon posted, 26.6 degree. As for why it isn't 64.3 degree is because slope is change in y over the change in x, thus this means horizontal change is 2 and vertical change is 1. When finding the line angle, simply use arc tan(opp/adj) or in this case arc tan(1/2) which will result in 26.6 degree.
As for the answer, its actually 95.36 ft lb if the vector is <2,2>
There are countless methods to solve this but let me explain one way.
It says for every 3 green you will have 7 red, therefore in 10 m&ms you will get 3 green and 7 red.
3 + 7 = 10
However, you want 100 m&ms not 10. I'm sure you've learned that whatever you apply to one side of the equation, you do the same to the other side. Knowing this, you multiply the right side by 10, so you get 100 m&ms, and following the rule for equation, you also have to multiply the left side by 10.
(10)3+7=10(10)
Use distributive property...
30+70=100
There are 30 red and 70 green m&ms.
Simply answer, "In what ways are we guided by the Universe?"
Chaldeans were basically the people who lived in Southern Babylonia.
I'm sorry, I swap the red and green m&ms by careless mistake :P
Take heed: It is important to double check your work or else something minor like this will get you a wrong answer.
Thank you Ms. Sue for pointing this out!
A is not it for sure and even if you do see a monument in front of it, the center is most like dedicated to the person who found it.
B. Not all monuments have line patterns.
C. A monument of an individual doesn't point out the beauty or importance of a landscape.
D. Why else would there by a monument of an individual? That individual must be important in one aspect or another.
Approaches are different for each person. I find it particularly useful by writing it down, then say the fact out loud countless times until you get to the point in which you remember it without the cards.
Try to make each fact a representation of something that interests you; this will allow easy memorization.
p-value is the probability of obtaining the observed sample result, in this case the "properly designed random sample."
p(vote)= 80/145
= .55
= 55%
.55 DOES NOT equal to 66% or .66
This really enters the boundaries of Chemistry, but I will explain it in simpler terms.
Since solution one contains 30% insecticide, this means 70% is not insecticide but of some other matter.
This applies to solution 2, 50% insecticide and 50% of some other matter.
It tells you to find 42% insecticide therefore when you combine the solution, in which your teacher kindly tells you that x+y=200, you would only want 42% insecticide.
(.42)(200)= 84
That is exactly what I was thinking. He was shot 6 months after he was elected for his second term. I suppose it's best to see what happened during those 6 months.
Square root 20 and Square root 45 can be simplified even further.
Square root 20 is simply Square root 4 times Square root 5. Square root 4 is equal to 2. Therefore, Square root 20 is equal to 2 Square root 5.
Square root 45 can also be simplified into Square root 9 times Square root 5. Square root 9 is equivalent to 3. Thus you multiply 3 with 2 on the outside and leave Square root 5 alone to get 6 Square root 5.
Thus far we get, 5/ 2 Square root 5 and we know this is not possible because the denominator cannot a square root. To solve this, simply multiply the numerator and denominator by 2 Square root 5. By doing so, the denominator cancels out and the numerator will result in 5 times 2 Square root 5 which is 10 Square root 5.
From earlier we got 6 Square root 5 as a result of the simplification.
Simply do 10 Square root 5 - 6 Square root 5 which will get you 4 Square root 5.
Yes, I was wondering the same thing too, the first equation indeed must be .3x + .5y = 84. This way it will make much more sense.
M1V1=M2V2
(200)(0.500)=(.200)x
x=500 mL
M1 is actually 0.5 and V1 is 200! My mistake there.
If temperature is above 0 degree Celsius, water doesn't naturally turn into ice. In fact, the opposite should be expected of.
The only way for water to turn into ice when temperature is above 0 degree Celsius is if there is an external source of energy, or in other words, not naturally occurring.
Therefore this reaction is non-spontaneous.
A non-spontaneous reaction has a delta G greater than 0, which is positive.
Therefore the sign of change in free energy in this case would be positive or A.
I think if you have dyslexia, you wouldn't have been able to self-reflect yourself into writing this problem. It is not given that all 12th graders could write at the level or standards of a good writer. Each person has his or her own strengths and weaknesses, therefore try to think in an optimistic perspective!
Real zeros can be found by using P over Q.
Factors of P over factors of Q.
You are very fortunate to have 47 as your P as its factors are only 1 and 47. As for Q, which is 6, its factors are 1,2,3,and 6. Do remember to put plus minus in front of each P divided by Q.
Use synthetic division for a problem such as this!
The angle formed from its standard position is 60 degree. Unless it says that these angles are in Quadrant 2, then you would have to use 180-60=120.
Law of Cosine is useful in Side-Angle-Side such as this question. Since they intersect at 120 degrees, then just plug in cos(120) instead of 60. When I plugged it into the calculator, I got 831.76.
you're going to divide that long equation by the quotients you got from p/q.
you will have to keep trying until you get a remainder equal to 0. Also, when setting up the synthetic division, make sure you write +0x^3 between 4x^4 and 3x^2.
2x + 3x is more than 20
5x is more than 20
x is more than 4
one possible answer is 2(5) white marbles and 3(5) blue marbles.
A) To create a slave state and a non slave state.
B) To create a free state where fugitive slaves could live.
C) To establish a line between slave and a non slave states.
D) To settle a disagreement between Missouri and Arkansas
Thank you so much =) Could you please help me with some other questions?
Ok.
Which action during westward expansion had the most negative impact on the lives of slaves?
The Fugitive Slave Act
The Mexican-American War
The Treaty of Washington
The Missouri Compromise of 1820
is it A?
Yay thank you=) can you help me with some more?
what was an effect of the California gold rush in 1849?
Many people discovered gold, became rich, and established multiple mining towns in California.
The president authorized the forced removal of the Sioux tribes in California where gold was discovered.
An influx of settlers from the U.S. and the world led to the growth of numerous cities in the West.
Conflicts between U.S. settlers and foreign miners from China and Europe resulted in military action.
I think its A
Is it C?
That's really cool! A couple more questions...
In Worcester v. Georgia, the Supreme Court ruled that Native American tribes were sovereign states. How did this affect Cherokee removal?
The federal government had to allow the Cherokee to vote on removal.
The federal government removed the Cherokee anyway.
The state of Georgia allowed some Cherokee to remain.
The state of Georgia was required to pay the Cherokee for their land.
Is it A or C
Do you know what the answer is?
a)267.9
b)803.8
c)2143.6
d)201.0
i think its a
Thank you so much bree and ms sue. could you help me with some more problems
thank you can u help me with some other questions
so is it c
Thank you Could you help me with a couple more
Thank you so much john and Write Teacher. Could you help me with a few more please.
Thank you ms sue
In which sentence does the prepositional phrase act as an adverb? is it b
A)Last evening, Anne suffered from a headache.
B)The door to the attic was left open.
C)Mr. Frank discussed the problem of noise in the annex.
D)He bought a drink for Mr. Dussel.
did you see the question i just put?
Thank you so much
In which sentence does the prepositional phrase act as an adjective? is it c
A)In the morning, we rested in bed
B)We bought the cookies in the red package
C)During the day, Peter played with the cat
D)My sister is good at dancing
so is the adverb one. C
or a
Please help someone
So its d for the first one and i think its c for the second one. it has more adjectives than the first choice.
am i right
is it d for that one
and for this one is it c
In which sentence does the prepositional phrase act as an adjective? is it c
A)In the morning, we rested in bed
B)We bought the cookies in the red package
C)During the day, Peter played with the cat
D)My sister is good at dancing
see the first related question below
please can you check..
yes i just wanted to ask two questions about the book act 2
ms sue pls help
is it a or b
Is it a? By the way i used to live in new york but not in new york city.
Thank you so much:))))))
Is it either a or d
is it a...
someone pls help me
what about d
is it d
so is it c?
is it c.. reed or ms sue
so is it d
please help me
I got it now thank you so much can i ask you some other questions
thank you
Do differences between people necessarily lead to conflict?
race
please help me Ms sue, damon, steve, somebody help me
thank you so much :)could you help me with some more questions please?
could you check my answer for this question
What are the first four terms of the sequence represented by the expression n(n-2)-3?
A. -5, -2, 1, 4
B. -4, -3, 0, 5
C.-3, 0, 3, 6
D. -2, 0, 2, 4
is it b
or reed
Reed or ms sue can u help me pls
I don't have a book lol
but is it b
i got it now. thank you so much reed and ms sue
what question did you get wrong
ms sue or steve or damon pls help me