Temperature increases with altitude in the
A) troposphere.
B) thermosphere.
C) mesosphere.
D) all of these
Answer: B
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A walker starts at the origin at 1:00 PM and walks 3.0 km from the origin toward the WEST to point A. She arrives at point A at 2:30 PM. She then walks from point A 2.0 km toward the WEST to point B and arrives at point B at 3:45 PM. The walker's average velocity for the entire trip is
A. 1.8 km/hr toward the EAST. B. 1.8 km/hr toward the WEST. C. 1.3 km/hr toward the WEST. D. 1.3 km/hr toward the EAST. E. 0.36 km/hr toward the WEST.
Why is an umbrella in danger of being turned inside out on a windy day?
What will be an ideal response?
Light from a 604-nm monochromatic source is incident upon the surface of fused quartz (n = 1.56) at an angle of 48°. What is the angle of reflection from the surface?
a. 12° b. 24° c. 48° d. 31° e. 75°
A tungsten wire is 1.50 m long and has a diameter of 1.00 mm. At 20°C a current of 50 mA flows through this wire
The temperature coefficient of resistivity for this tungsten is 4.5 × 10-3/C°, and its resistivity at 20°C is 5.6 × 10-8 ? ? m. (a) What is the potential difference across the ends of this wire at 20°C? (b) If the wire temperature increases by 100 C°, what potential difference across its ends is now required to produce a current of 50 mA?