A little more than half an electron volt is applied to a hydrogen atom to just remove its outermost electron. What energy level must this electron have been in?
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The greater efficiency achieved with the curved blades of a Pelton wheel is due to
A) bouncing. B) greater time of water impact. C) rotational momentum. D) divided impulse.
What law of nature explains why electrons must arrange themselves in atoms with no more than two per energy level, thus making chemistry possible?
A) the exclusion principle B) the uncertainty principle C) the law of conservation of energy D) the law of conservation of angular momentum E) the electromagnetic force law
By how much will a slab of concrete 18. m long contract when the temperature drops from 24.°C to -16.°C? (The coefficient of linear thermal expansion for concrete is 12 × 10-6 per degree C.)
A) 1.5 cm B) 0.86 cm C) 70. mm D) 15. cm E) 0.5 cm
A stone is thrown straight up. When it reaches its highest point,
A) both its velocity and its acceleration are zero. B) its velocity is zero and its acceleration is not zero. C) its velocity is not zero and its acceleration is zero. D) neither its velocity nor its acceleration is zero. E) neither velocity nor acceleration can be determined without additional information.