An object travels 7.5 m/s toward the West and under the influence of a constant net force of 5.2 kN, it comes to rest in 3.2 s. What is its mass?
A. 1600 kg
B. 12000 kg
C. 1100 kg
D. 690 kg
C. 1100 kg
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In gas turbine recuperators, the exhaust gases are used to heat the incoming air and Cmin/Cmax is therefore approximately equal to unity. Show that for this case e = NTU/(1 + NTU) for counterflow and e = 1/2 (1 – e– 2NTU) for parallel flow.
GIVEN
• Gas turbine recuperator
• Cmin /Cmax ? 1
FIND Show that
(a) e = NTU/(1 + NTU) for counterflow
(b) e = 1/2 (1 – e– 2NTU) for parallel flow
SKETCH
Which statement correctly locates the formation of the Earth and the appearance of the first humans on the cosmic calendar, which compresses the 14-billion year history of the universe into one "year," where "now" is exactly midnight,
A) Earth forms in January, life begins in April, and humans appear in early December. B) Earth forms in January, life begins in September, and humans appear in October. C) Earth forms in early September, life begins in late September, humans appear a few hours before midnight, Dec 31. D) Earth forms in early September, life begins in November, and humans appear on Dec 15.
When observing a quasar, we are probably looking at a stage of evolution in the very early universe
Indicate whether the statement is true or false
In the process of nuclear fusion,
A) two or more nuclei fuse or stick together to form a heavier nucleus that has exactly the same mass as the original nucleus B) a heavy nucleus breaks apart into a number of smaller nuclei whose combined mass is less than the original nucleus C) two or more nuclei fuse or stick together to form a heavier nucleus whose combined mass is slightly less than the original nucleus D) two or more nuclei fuse or stick together to form a heavier nucleus whose combined mass is slightly greater than the original nucleus