Three solid objects of the same material and of equal mass –
a sphere, a cylinder (length = diameter) and a cube – are at
5000C initially. These are dropped in a quenching bath
containing a large volume of cooling oil each attaining the
bath temperature eventually. The time required for 90%
change of temperature is smallest for
a) cube
b) cylinder
c) sphere
d) equal for all the three
whyyyyyyy???????
Answers were Sorted based on User's Feedback
Answer / vinay upadhyay
answer (d) is correct . because here change of tempr is depend on characteristic length of object and according to ques characteristic length of each will same so their gainig of 90% of tempr difference will requires same time . tou =row *characteristic length*heat capacity /heat transfer cofficient
Is This Answer Correct ? | 0 Yes | 0 No |
Answer / vas
answer 1 (cube) is correct since temp change depends on few
factors, one of which is footage (S) of contact between the
body and substance. Among other equal factors the footage
is different. Thus, the only problem for us here is to find
out solution how to compare footages of the bodies we have.
Since we know that their weights are equal and know the
formulas for figuring out their weights, we will find soon
that the smallest S belongs to the cube, consequently the
biggest belongs to the sphere.
Is This Answer Correct ? | 1 Yes | 2 No |
What is the iodine value of spent carbon?How iodine value is used to determine the power of carbon to adsorb?
what is the purpose of capacitor? and capacitor load means what? how does it connect?
my qualification is b.tech- industrial biotech. i was read about many chemical engineering subject as a allied like unit operation, chemical thermodynamics, chemical reaction engineering , mass transfer and separation, downstream processing and principle of chemical engineering. and i have 2 yrs working exprience on in the field of instrumentation and control... and my query is "can i able work as process technologist" and which subject i want conc. more?........
which book is better for written test of a refinery or a chemical industry-o.p gupta or DR.RAM PRASAD?
What are some factors to consider when trying choosing between a dry screw compressor and an oil-flooded screw compressor?
DIFFERENTIAL EQUATIONS - EXAMPLE 20.2 : During the landing process of an airplane, the velocity is constant at v. (a) If the displacement of the plane is x at time t, find the differential equation that relates t, x and v. (b) The plane has 2 parts of wheels - the front and the back, separated by a distance L. The front part of the wheel touches the land first, that allows the straight body of the plane to form an angle T with the horizontal land. If the vertical distance between the back part of the wheel and the horizontal land is y, find the equation of y as a function of L and T. (c) Find the differential equation that relates dy as a function of dt, v and sin T. (d) Find the differential equation that consist of dy as a function of y, L, v and dt. (e) Find the equation of y as a function of v, L, t and C where C is a constant. (f) When t = 0, prove that y = exp C as the initial value of y.
how we can find solubility of liquid in amyl alcohol and relative solubility of amyl alcohol
We have some pieces of metals that have been 'powder coated', how does that work?
What are the apt definitions for apparent power, active power and reactive power?
Explain what are the assumptions made on conservation equation?
What is the symbol of sodium?
what is meant by runaway temperature in a reactor?