A helium-filled weather balloon has a 0.90-m radius at liftoff where air pressure is 1.0 atm and the temperature is 298 K. When airborne, the temperature is 210 K, and its radius expands to 3.5 m. What is the pressure at the airborne location?
a. 0.50 atm
c. 0.019 atm
b. 0.012 atm
d. 0.38 atm
B
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A hole of radius 1.0 mm forms in the bottom of a very large water storage tank that holds water to a depth of 15 m. At what volume rate will water flow out of the hole?
A) 5.4 × 10-6 m3/s B) 5.4 × 10-7 m3/s C) 5.4 × 10-5 m3/s D) 5.4 × 10-4 m3/s
Two speakers in an automobile emit sound waves that are in phase at the speakers. One speaker is 40 cm ahead of and 30 cm to the left of the driver's left ear. The other speaker is 50 cm ahead of and 120 cm to the right of the driver's right ear. Which of the following wavelengths is(are) in phase at the left ear for the speaker on the left and the right ear for the speaker on the right?
A. 10 cm B. 20 cm C. 650 cm D. All of the wavelengths listed above. E. Only the wavelengths listed in (a) and (b).
The shortest day of the year for the Northern Hemisphere is December 21.
Indicate whether the statement is true or false.
To an observer on Earth, dust in the interstellar medium will cause a star to appear_______________ and_______________than it really is
Fill in the blank(s) with correct word