If you take 6 litres of air from the surface to 20 metres/66 feet, the volume will be __________ litres.
a. 1
b. 2
c. 3
d. 4
Ans: b. 2
You might also like to view...
Three charges are located along a horizontal straight line. The charge on the left has a force of 6.00 N on it to the left. The charge in the middle has a force on it of 4.00 N to the right. What is the force on the charge on the right?
A. 2.00 N to the right B. 10.0 N to the right C. 10.0 N to the left D. 24.0 N to the right E. there isn't enough information in the problem to solve this
An economizer is to be purchased for a power plant. The unit is to be large enough to heat 7.5 kg/s of pressurized water from 71 to 182°C. There are 26 kg/s of flue gases (cp = 1000 J/(kg K)) available at 426°C. Estimate (a) the outlet temperature of the flue gases and (b) the heat transfer area required for a counterflow arrangement if the overall heat transfer coefficient is 57 W/(m2 K).
GIVEN
Counterflow heat exchanger - flue gases heating water Water flow rate ( m w)= 7.5 kg/s Water temperatures
? Tw,in = 71°C
? Tw,out = 182°C Gas flow rate ( m g) = 26 kg/s Gas specific heat (cpg) = 1000 J/(kg K) Gas inlet temperature (Tg,in) = 426°C Overall heat transfer coefficient (U) = 57 W/(m2 K)
FIND
(a) Outlet gas temperature Tg,out
(b) Heat transfer area (A) required
SKETCH
PROPERTIES AND CONSTANTS
the specific heat of water at the mean temperature of 126.5°C (cpw)= 4240 J/(kg K)
The work you do when pushing a shopping cart twice as far while applying the same force is
A) half as much. B) twice as much. C) four times as much. D) the same amount.
When we say that the Sun is a ball of plasma, we mean that ________
A) the Sun is made of material that acts like a liquid acts on Earth B) the Sun is roughly the same color as blood C) the Sun is made of atoms and molecules D) the Sun consists of gas in which many or most of the atoms are ionized (missing electrons)