A weak acid is one that does not
a. taste very sour.
b. ionize appreciably in water.
c. form hydrogen gas when a metal is dropped in.
d. neutralize OH- ions.
b
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In an electromagnetic wave, the electric and magnetic fields are oriented such that they are
A) parallel to one another and perpendicular to the direction of wave propagation. B) parallel to one another and parallel to the direction of wave propagation. C) perpendicular to one another and perpendicular to the direction of wave propagation. D) perpendicular to one another and parallel to the direction of wave propagation.
If you somehow increased Earth's radius, without changing its mass, would this affect your weight?
A) Yes, your weight would increase. B) No, because your weight always remains the same regardless of how you change the external surroundings. C) No, because the force of gravity on your body depends only on your mass and on Earth's total mass--it doesn't depend on Earth's size. D) Yes, your weight would decrease.
For the woman being pulled forward on the toboggan in the figure below, the magnitude of the normal force exerted by the ground on the toboggan is
A radio signal emitted from Earth would take about
A) 4 years to leave our galaxy. B) 20,000 years to leave our galaxy. C) 80,000 years to leave our galaxy. D) 100,000 years to leave our galaxy.