A hockey puck slides along an icy pond. Without any kind of friction, the force needed to sustain sliding is
A. the mass of the puck multiplied by 10 m/s2.
B. the weight of the puck divided by its mass.
C. equal to the weight of the puck.
D. none at all.
Answer: D
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Which of the following bonds would be the least polar?
A. C-O B. C-H C. C-Cl D. C-F E. All are equally polar.
The hydrologic cycle refers to
A) seawater that is drawn into mid-ocean ridges, heated, and rises to the surface. B) water that is heated by magma and rises in hot springs. C) the rising and falling of tides in a cyclical manner. D) the way water is used to generate electrical energy. E) None of these are correct.
A nuclear chain reaction occurs
A. when an atoms splits. B. when neutrons released from a splitting atom colliding with the nucleus of another atom, causing it to split. C. when the nuclei of several atoms split simultaneously. D. when a rapidly moving neutron collides with an electron causing it to split into neutrons and other particles.
Currently, fossil fuels meet ________ of the global energy needs
A) 70% B) 79% C) 5% D) 35% E) 57%