When forming covalent compounds, atoms ______________ electrons
Fill in the blank(s) with correct word
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Buoyancy: A polar bear of mass 200 kg stands on an ice floe that is a uniform 1.0 m thick. What is the minimum area of the floe that will just support the bear in saltwater of density 1030 kg/m3? The density of ice is 980 kg/m3.
A. 1.0 m2 B. 2.0 m2 C. 3.0 m2 D. 4.0 m2
Water is one of the most common substances in the universe, and vital to us on Earth. What happened to it on Mars?
What will be an ideal response?
A small gas laser of the type used in classrooms may radiate light at a power level of 2.0 mW. If the wavelength of the laser light is 642 nm,
how many photons does it emit per second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
The current standard definition for the second has been based on which of the following?
a. characteristic frequency of the light from cesium atoms b. average solar day c. sidereal day d. Greenwich Civil Time