Answer:
, ,
Explanation:
Let assume that steam has a fully developed and turbulent flow and that tube is smooth and thin-walled. The steam is heated while flowing through the tube. The Nusselt number is given by the Dittus-Boelter equation:
Properties of steam at given pressure and temperature are:
The Reynolds and Prandtl numbers are, respectively:
(which demonstrates the reasonability of the supposition of turbulent flow)
The Nusselt number is:
The Nusselt number has the following definition:
The heat transfer coefficient is:
The convection is the dominant heat transfer mechanism, then:
Take the absolute value, meaning positive, of the following equation....
(Value found - Value accepted)/(Value accepted)
You will get a 0.#####, then you....
0.#### x 100= percent error
So for your case...
(15-15.6)/15= 0.3846...... (absolute value)
0.3846.... x 100= 3.846%
If you are doing significant figures it will be 3.8%
Hope this helps!!'
Density = mass / volume
So density =567.5/50 = 11.35 g/cm3.
Answer:
Id = 1/2 Md * R^2 = 1/2 * .1 * .1^2 = .0005 kg m^2 inertia of disk
Ib = Mb * R^2 = .02 * .1^2 = .0002 kg m^2 inertia of bug at edge
(Id + Ib) w1 = Id w2 conservation of angular momentum
w2 = .0007 / .0005 * 10 = 14 /sec angular speed with bug at center
KE1 = 1/2 I1 * w1^2 = 1/2 * .0007 * 10^2 = .035 kg m^2 / s^2
KE2 = 1/2 * I2 w2*2 = (.0005 / 2 ) ^ 14^2 = .049 kg m^2 / s^2
The bug has to exert radial force on the disk to maintain its
centripetal acceleration. As the bug crawls to the center of the disk it
does work against this centripetal force which appears as an increase
of rotational energy of the disk. As the the bug crawls back to the edge
of the disk, the disk does work on the bug and loses KE.
Answer:
the correct one is D
Explanation:
A question that can be answered with a scientific investigation must be a question where measurements of some kind can be made and with these measurements check that the question is correct or not.
When examining the answers the correct one is D