Krypton (atomic number 36) has how many electrons in its next-to-outer shell (n = 3)?
1.2
2.4
3.8
4.18
4
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A ________ is believed to occur when energy, stored in a twist in the solar magnetic field above a sunspot, is suddenly released
a. solar flare b. supergranule c. spicule d. coronal hole e. none of the others
As we look at larger and larger scales in the universe, we find
A) a larger and larger percentage of the matter is dark. B) almost exclusively visible matter. C) a larger and larger percentage of the matter is visible. D) smaller and smaller masses. E) an equal amount of visible and dark matter.
A 350-g air track cart on a horizontal air track is attached to a string that goes over a frictionless pulley with a moment of inertia of 6.00 × 10-6 kg ? m2 and a radius of 1.35 cm
If the string is pulled vertically downward by a force of 2.50 N, (a) what is the magnitude of the acceleration of the cart, and (b) what is the tension in the horizontal string between the pulley and the cart?
We can measure the radii of stars in an eclipsing binary system, in addition to the masses
Indicate whether the statement is true or false