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There is a 70 W heat leak from a room at temperature 22 °C into
an ideal refrigerator. How much electrical power is needed to
keep the refrigerator at -10 °C?
write a program to print the product of given two numbers.
Box A and Box B both contain the numbers 2, 4, 6 and 8. Construct the probability mass function and draw the histogram of the sum when one number from each box is taken at a time, with replacement.
What is the molarity of 0.650L of solution containing 63g of Nacl
rina walks from home to school everyday how far is the school from her house if it takes 10 minutes to walk at a pace of 50 m/mins
A company producing lubricating oil that the average content of the containers is 20 litres. Test this claim if a random sample of ten containers are 20.5, 19.4, 20.2, 19.8, 20.6, and 19.6 litres .assume normal distribution and use 1% level of significance
the mean serum cholesterol level of a large population of overweight children is 220 mg per deciliter (mg/dl), and the standard deviation is 16.3 mg/gl. If a random sample of 35 over which children is selected, find the probability that the mean will be between 220 and 222 mg/ dl. Assume the serum cholesterol level variable is normally distributed.
A packed counter-current water cooling tower is used to cool
1.356 kg/s.m2
of water from 43.3 °C to 26.7 ºC. The air enters from the bottom
of the tower at 23.9 ºC with a wet bulb temperature of 21.1 ºC. The whole of the
resistance to heat and mass transfer can be considered as being within the gas
phase and the product of the mass transfer coefficient and the transfer surface
per unit volume of column (KG.a) may be taken as 1.207×10-7
kmol/s.m3
.Pa.
The tower operates at atmospheric pressure. Calculate the minimum air flowrate
and the necessary height of the tower when 1.5 times of minimum is used as
actual air flowrate.
Data: Latent heat of water at 0 ºC = 2501 kJ/ kg
Heat capacity of dry air = 1.005 kJ/ kg. ºC
Heat capacity of water vapour = 1.88 kJ/ kg. ºC
Density of air = 1.198 kg/ m3
Enthalpy of saturated air-water vapour data are as follows:
Hyi, kJ/kg dry air 84 97.2 112.1 128.9 148.2 172.1 197.2
Temperature, ºC 26.7 29.4 32.2 35 37.8 40.6 43.3
A 30-plate bubble cap column is to be used to remove n-pentane
from oil by means of pure steam stripping. The inlet oil contains 6% n-pentane
by volume and it is desired to reduce the n-pentane to 0.1% by volume. Assume
isothermal operation and an overall plate efficiency of 30%. Find out the ratio
of actual to minimum steam consumption. The equilibrium relation for the
system is y=3x.
A positive and negative charge, each of magnitude 3.7 * 10 ^ - 6 * C are separated by a distance of 25 cm. Find the force on each of the particles .
#340153 on Dec 2023