Why is an umbrella in danger of being turned inside out on a windy day?
What will be an ideal response?
Answer: Because of the umbrella's curvature, air passes faster over its top than across its bottom. This produces a difference in forces, and like an airplane wing, experiences lift. This is in accord with Bernoulli's principle. The lift can turn or flip the umbrella inside out.
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The name of the transuranium element commonly used in smoke detectors is ______________
Fill in the blank(s) with correct word
About how hot was the Big Bang when matter and energy "decoupled"?
A) 900 million K B) 15 million K C) 3,000 K D) 300 K E) 2.73 K
A hydrogen atom initially in the n = 6 state decays to the n = 2 state. The emitted photon is detected in a photographic plate. What is the wavelength of the detected photon?
The lowest level energy state of hydrogen is -13.6 eV. (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s) A) 1090 nm B) 93.1 nm C) 410 nm D) 93.8 nm
The age dating of the solar system is done by radioactive dating of ________
Fill in the blank(s) with correct word