An oak tree was planted ago. How many seconds does this correspond to? (Do not take leap days into account.)
A) 6.9 × 108
B) 1.2 × 107
C) 2.9 × 107
D) 2.8 × 108
A
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What substances existed as solid flakes within the innermost regions (within about the inner 0.3 AU) of the solar system before planets began to form?
a. none b. only rocks and metals c. only hydrogen compounds d. only hydrogen and helium gases
Io, Europa, Ganymede, and Callisto are called the "Galilean" satellites because:
A. They are named after Galileo's daughters. B. The "Galileo" spacecraft discovered them. C. Galileo was the first to identify them as moons of Jupiter. D. They were discovered the year Galileo died. E. "Jupiter" was originally called "Galileo" in Greek.
As an electron slows down from 0.9980c to 0.5000c, how much momentum does it lose?
(c = 3.0 × 108 m/s, melectron = 9.11 × 10-31 kg)
A heat exchanger uses a staggered tube arrangement of 1 in diameter tubes and with ST = SD = 3 inches. There are four columns of 10 tubes per column and all of the tube surfaces are at 190ºF. Atmospheric air at 80ºF and 14.5 psia is forced across the tube tank at 5 ft/s. Determine the air temperature downstream from the tube bank and the downstream pressure.
What will be an ideal response?