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Chemistry question about possibility of creating and how to made soap that melt rapidly when in contact with water?
My chemistry teacher want us to research the possibility of solid soap that melt rapidly into soapy or liquid state when contact with water. I don't see that possibility, any insight to share?
1 AnswerChemistry5 years ago
Ball Bearing quiz, please help I don't get a clue, what is the answer?
Manufacturers who use bearings in their products have an obvious interest in reliability of these components. This is important information because manufacturers need to estimate when the bearings need replacing. The reliability of bearing is defined as bearing life, that is, how long we can expect the bearing to last under the same operating condition.
A bearing life is measured as the total number of revolutions at a given constant speed required for failure criteria to develop. A rating life is the number of revolutions at a constant speed that 90% of a group of bearings will complete or exceed before failure.
The data set given are real data taken from Lieblein and Zelen’s (1956) study. It consists of 210 endurance tests carried on bearings produced in three different factories under the same manufacturer. Each test involved a batch of bearings of the same type under the same condition and observing its reliability.
Describe what you understand by these numbers (read across a row).
and
Suppose that a bearing is revolved at a constant speed of 500 revolutions per minute, how many days can an average bearing last if it is used non-stop?
Refer to l10 19.2 and L50 84.5
1 AnswerPhysics6 years ago
Ball Bearing quiz....can anyone provide me with some insight or answer?
Manufacturers who use bearings in their products have an obvious interest in reliability of these components. This is important information because manufacturers need to estimate when the bearings need replacing. The reliability of bearing is defined as bearing life, that is, how long we can expect the bearing to last under the same operating condition.
A bearing life is measured as the total number of revolutions at a given constant speed required for failure criteria to develop. A rating life is the number of revolutions at a constant speed that 90% of a group of bearings will complete or exceed before failure.
The data set given are real data taken from Lieblein and Zelen’s (1956) study. It consists of 210 endurance tests carried on bearings produced in three different factories under the same manufacturer. Each test involved a batch of bearings of the same type under the same condition and observing its reliability.
Describe what you understand by these numbers (read across a row).
4. Referring to cells H2 and I2
Suppose that a bearing is revolved at a constant speed of 500 revolutions per minute, how many days can an average bearing last if it is used non-stop?
1 AnswerEngineering6 years agoHow to show that the moment of inertia and energy needed is... help please preparation for exam?
(a) Show that the moment of inertia for each of the axles about its axis of rotation is 24 kgm2.
1 AnswerPhysics7 years ago
How do I solve this differential question,I can do c1 part a? how to do b)? Why am my previous working wrong? please help?
How do I solve this differential question,I can do c1 part a? how to do b)?
I reach V^2+49=Ae^(-t/1200) and after that i set t=0 , v= 16 and I get A= 305 than i sub 305 into A, and V=14 into the equation. wrong?
1 AnswerMathematics7 years agoCan anyone teach me this bending theory question, i really don't know how to do, please?
https://www.icloud.com/photostream/#AEGY8gBYGdYO6S...
(please wait awhile, the pic will get clearer)
1 AnswerEngineering7 years agoHow to solve (3x - 4) / root(2+x-3x^2) dx, please help?
I Need to solve using completing the square and also the formulae of 1/root(a^2-x^2) dx = sin^-1 (x/a) + c
to prove (3x - 4) / root(2+x-3x^2) dx = - root(2+x-3x^2) - 2.02sin^-1((6x-1)/5) + C
2 AnswersMathematics7 years ago(3x-4) / ((2+x-3x^2)^(1/2)) dx .... how to get the confusing answer given?
(3x-4) / ((2+x-3x^2)^(1/2)) dx
My solution sheet, said the answer was -root(2+x-3x^2) - 2.02sin^-1((6x-1)/5) + C
i just could not understand how to get the above answer
2 AnswersMathematics7 years agoIf y= root(x(1-x)) - tan^-1 (root(1-x)/x) prove that x(dy/dx)^2 = 1-x?
If y= root(x(1-x)) - tan^-1 (root(1-x)/x) prove that x(dy/dx)^2 = 1-x
I work untill 1/2 ((1-2 x)/sqrt(-(-1+x) x)+(2-x)/(sqrt(1-x) (1-x+x^2))) but don't know how to show
1 AnswerMathematics7 years agoHow to change 1/(sqrt(1-1/x^2) x^2) to x sqrt(-1+x^2)?
How to change 1/(sqrt(1-1/x^2) x^2) to 1/x sqrt(-1+x^2)
or x^2/(sqrt(1-1/x^2) to 1/x sqrt(-1+x^2)
1 AnswerMathematics7 years agoCan anyone show me why d/dx(cot^-1 (x)) = 1/ (1+ x^2)?
I can't figue out how to show that
a) d/dx(cot^-1 (x)) = 1/ (1+ x^2)
b) d/dx (sec^-1 x) = 1/( lxl root(x^2 -1))
c)d/dx(csc^-1 x) = - 1/( lxl root(x^2 -1))
teach please
1 AnswerMathematics7 years agoDifferentiation of inverse trigonometric question, i have difficulties proving this question, please help?
If Y= (root(x(1-x))) - (tan^-1(root((1-x)/x))) , how to prove that x(dy/dx)^2 = 1-x
1 AnswerMathematics7 years agoHow to find volume of revolution using disk method? http://postimg.org/image/qqqlh2p99/full/?
How to use disk method to find volume of revolution on the first question?
http://postimg.org/image/qqqlh2p99/full/
I do not know how should I apply disk method to the first question, abit confusing
1 AnswerMathematics7 years agoHow to use disk method to find volume of reveloution on this question?
http://postimg.org/image/qqqlh2p99/full/
I do not know how should I apply disk method to the first question, abit confusing
1 AnswerMathematics7 years agoGuys I really got difficult solving this question of volume of revolution, please help, Test coming?
I can't do this two question, i can do basic one. but not the one with star
1 AnswerMathematics7 years agoCouple of curious question about definite integrals?
i want to find area under the curve using a square shape but the square is (2,4) coordinates. Can the area of square be valid in this cases?
1 AnswerMathematics7 years agoa watermelon has an ellipsoidal shape with major axis 28cm and minor axis 25 cm find it volume Vx?
How to do this volume of revolution question, i really lost on how to get the curve equation?
Please teach me please
1 AnswerMathematics7 years agoHelp with integral by substitution method, please?
((27e^(9x) + e^(12x))^(1/3)) dx - how to do this, anyone can teach me?
1 AnswerMathematics7 years ago
