A ball thrown upwards reaches a maximum height and then comes back down to the original level. As the ball is going upwards
a. the velocity and acceleration both point up
b. the velocity points up and the acceleration down
c. the velocity points down and the acceleration up
d. the velocity and acceleration both point down
e. the acceleration is zero
B
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Spherical Mirrors: Single convex spherical mirrors produce images that
A. are always smaller than the actual object. B. are always larger than the actual object. C. are always the same size as the actual object. D. could be larger than, smaller than, or the same size as the actual object, depending on the placement of the object. E. are sometimes real.
A compound of which element is used as a diet supplement to prevent thyroid problems?
a. Chlorine b. Calcium c. Carbon d. Iodine
The predominant gas in the atmosphere of Mars is
A) oxygen. B) nitrogen. C) water vapor. D) carbon dioxide. E) methane.
All of the following have occurred over long periods of time on Earth. Which one is not thought to have played a major role in long-term changes in Earth's climate?
A) a gradual rise in the atmospheric content of oxygen B) changes in the Earth's axis tilt C) changes in the Earth's overall reflectivity D) changes in the atmospheric concentration of greenhouse gases