Mars appears red due to ________ on its surface
Fill in the blank(s) with correct word
rust, or iron oxide
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Newton's second law states: sum of forces = mass × acceleration. According to this, what property can you determine if you observe the acceleration of an object with a known mass?
A) the value of a single force acting on the object B) the current location of the object C) the current velocity of the object. D) the sum total of all forces acting on the object
We construct a closed Gaussian surface in the shape of a spherical balloon. Assume that a small glass bead with total charge Q is in the vicinity of the balloon. Consider the following statements:
A. If the bead is inside the balloon, the electric flux over the balloon's surface can never be 0. B. If the bead is outside the balloon, the electric flux over the balloon surface must be 0. Which of these statements is valid?
1.Only A is valid. 2.Only B is valid. 3.Both A and B are valid. 4.Neither one is valid.The Tully-Fisher relation exists between the galaxy's luminosity and its
A) age. B) mass. C) size. D) rotation. E) color.
Calculate the overall heat transfer coefficient and the rate of heat flow from the hot gasses to the cold air in the cross flow tube-bank of heat exchanger shown in the accompanying illustration for the following operating conditions
Air flow rate = 0.4 kg/s.
Hot gas flow rate = 0.65 kg/s.
Temperature of hot gasses entering exchanger = 870°C.
Temperature of cold air entering exchanger = 40°C.
Both gases are approximately at atmospheric pressure.
GIVEN
? The crossflow tube bank heat exchanger shown above
? Air flow rate
( ma ) = 0.4 kg/s
? Gas flow rate
( mg) = 0.65 kg/s
? Entrance temperatures
? Air (Ta,in) = 40°C
? Gas (Tg,in) = 870°C
? Both gases are at 1 atm pressure
FIND
(a) The overall heat transfer coefficient
(b) The rate of heat transfer (q)
ASSUMPTIONS
? The hot gases have the same thermal properties as air
? No scaling
? Thermal resistance of the tube walls can be neglected
PROPERTIES AND CONSTANTS
From Appendix 2, Table 28, for dry air at the entering temperatures
