To kick a football so it won't topple end over end, kick it so the force of impact extends
A) above its center of gravity.
B) through its center of gravity.
C) below its center of gravity.
Answer: B
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Photoelectric Effect: A metallic surface is illuminated with light of wavelength 400 nm. If the work function for this metal is 2.40 eV, what is the maximum kinetic energy of the ejected electrons, in electron-volts? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
An airplane travels from east to west with a velocity 450 mi/hr relative to the Earth. At the same time the wind is blowing from west to east at 50 mi/hr. What is the speed of the plane with respect to the air?
A. 500 mi/hr B. More than 400 mi/hr but less than 450 mi/hr C. 400 mi/hr D. 450 mi/hr E. More than 450 mi/hr but less than 500 mi/hr
At present, the formation of the solar system is believed by most astronomers to have begun with a large, swirling volume of cold gas and dust called the ______________ nebula
a. condensation b. primordial c. accretion d. celestial
Red giants
A) are mature stars that are fusing hydrogen into helium in their cores B) are dead stars C) have exhausted their nuclear fuel and are in the process of dying D) are in the process of forming