The red coloration seen on the Martian surface originates from
A. when Mars' had flowing water, it also has red algae, which stained the surface rocks.
B. the iron minerals in the surface rocks combining with oxygen in the atmosphere causing the surface to rust.
C. the atmosphere blocking out blue light, only allowing red light to reflect off the surface.
D. past volcanic activity covering the surface of the planet with red lava.
Answer: B
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Draw the following directions in a cubic unit cell: [001], [001], [110], [111], [111], [112], and [123]. Label each direction, and show the coordinates of where each direction intersects the boundary of the unit cell.
What will be an ideal response?
An electron has a velocity of 6.0 × 106 m/s in the positive x direction at a point where the magnetic field has the components Bx = 3.0 T, By = 1.5 T, and Bz = 2.0 T. What is the magnitude of the acceleration of the electron at this point?
A. 2.1 × 1018 m/s2 B. 1.6 × 1018 m/s2 C. 2.6 × 1018 m/s2 D. 3.2 × 1018 m/s2 E. 3.7 × 1018 m/s2
A one-pass condenser-heat exchanger, shown in the sketch, has 64 tubes arranged in a square array with 8 tubes per line. The tubes are 1.22 m long and are made of copper with an outside diameter of 1.27 cm. They are contained in a shell at atmospheric pressure. Water flows inside the tubes whose outside wall temperature is 98°C. Calculate (a) the rate of steam condensation and (b) the temperature rise of the water if the flow rate per tube is 0.0454 kg/s.
GIVEN
? One-pass condenser heat exchanger with 64 tubes in a square array
FIND
(a) Rate of steam condensation
(b) Water temperature rise
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, the properties of saturated water at the film temperature (100 + 98)/2 = 99°C are
________ has a rotation period of 59 days, 2/3 as long as its 88 day year
Fill in the blank(s) with correct word