The Local Bubble was probably created by:
A) the strong solar winds created by the new-born Sun.
B) the Crab Nebula supernova of 1054 AD.
C) the magnetic fields of the Milky Way in our spiral arm.
D) a nearby supernova perhaps 300,000 years ago, brighter than the full Moon.
E) the interaction between the solar wind and the Oort Cloud.
D
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The instruction manual for a hot-wire anemometer states that ‘roughly speaking, the current varies as the one-fourth power of the average velocity at a fixed wire resistance’. Check this statement, using the heat transfer characteristics of thin wire in air and water.
GIVEN • A thin current carrying wire in an air or water stream FIND • Show that the current (I) varies as the one-fourth power of the fluid velocity (V?) at a fixed resistance (ReI) ASSUMPTIONS • Radiative heat transfer is negligible
An airplane undergoes the following displacements, all at the same altitude: First, it flies 59km in a direction 30.0° east of north. Next, it flies 58.0km due south. Finally, it flies 100km 30.0° north of west
Use components to determine how far the airplane ends up from its starting point. A) 71.5 km B) 73.0 km C) 68.7 km D) 74.4 km E) 70.1 km
Two identical atomic clocks are made. One is placed in the foothills of the Rocky Mountains at the NIST in Boulder, Colorado, about one mile above the sea level, and the second is flown in a GPS satellite around Earth at about 17,000 mph. Which clock gets ahead of the other?
A. The Boulder clock B. Both clocks run at the same rate C. The clock in orbit
For an eye that is 2.4 cm in diameter, what must be the range of focal lengths of the lens to focus objects from the near point (25 cm) to infinity on the retina?
What will be an ideal response?