Recent content by scientist

Homework Statement A boiler drum is equipped with hemispherical heads (i.e. the two heads together make a sphere.) The diameter of the drum is 0.8 meters and the drum is 5 meters in length. Calculate: a.) The area of insulation required to cover the entire drum. b.) The total...

Is this correct? 3x + x*sqrt(5) = 2 solution (3x + x*sqrt(5)) = 2 I factored out the x x (3 + sqrt(5)) = 2 Divide both sides by sqrt(5) + 3 x (3 + sqrt(5) / (sqrt(5) + 3) = (2) / (sqrt(5) + 3) cancel x = (2) / (sqrt(5) + 3) final answer Is this correct?

Could a tutor check my solution to my radical question? It is enclosed in this attachment as a word document.

OK, the length is 9m NOT 12m. I understand that now. I have more of these type of questions. I will practice.

VOLUME: volume of the ends = 4*3.14*r^3 / 3 = 4*3.14*1.5 m^3 / 3 = 14.13 m^3 14.13m^3 / 2 = 7.065 m^3 at each end. volume of cylinder = 3.14*r^2*h = 3.14*1.5^2*12m = 84.78m^3 volume total = 84.78m^3 - 7.065m^3 = 77.715m^3 ----------------------------------------- SURFACE AREA...

Ok, the percentage efficiency is 81.7%. How can I find out what kind of simple machine this would be?

Which nonstandard value did I use? Why do you think that this efficiency is low? What is the maximum theoretically possible efficiency? The maximum theoretically possible efficiency would be 100%. I think the efficiency is low because we have a number of .817.The efficiency of any machine...

Ok, let's get the height straightened out first. HallsofIvy asked: The crucial point is whether the overall length is 12 m or only the length of the cylinder. Exactly what does your problem say? The problem in my book says the overall length is 12 meters. So there is only one number left for...

To: Curious3141 The height of the cylinder is 12 meters high. The length and the height are the same thing. Both are 12 meters. The volume of the hemispherical ends = 2*pi*r^3 / 3. V=2*3.14*1.5^3 / 3 = 21.195 / 3 = 7.065 m^3 at each end. The total surface area of the...

Could a tutor please check my work? question: What is the surface area and volume of a pressure vessel in the form of a cylinder with each end in the form of a hemisphere, if the overall length is 12 meters and the diameter is 3 meters. solution: given: radius = 1.5m diameter = 3m...

Homework Statement Could I please have a tutor check my answer and solution? question: An effort of 3 kN is required to move a mass of 2000 kg in a certain simple machine. If the mass is raised 1.5 meters while the effort moves 12 meters, find the efficiency? [b]2...

------------------------------------------------------ Would then the diameter be this: diameter = circumference / pi = 24cm ------...

May I have a tutor check over my question and solution? Problem Two rectangular sheets 20cm x 24cm and 15cm x 30cm are to be rolled to form cylinders. What is the height and diameter of the cylinder with maximum surface area that can be formed using either of these sheets? My Solution...

From scientist I would like to thank all my physics tutors for the outstanding information I received during this lengthly post! I have learned a lot! I will study and learn these principles.

Correct ------------------------------------------- You are correct! Because the total length of 2 meters divide by the MA of 4:1 equals 0.4 meters. 2 meters ------- 4+1=5 =0.4 meters