The oldest fossils on Earth
a. show that life began in Africa.
b. show that life began in lush regions between large rivers.
c. show that life began in the oceans.
d. are at least 5 billion years old.
e. at most 5 million years old.
C
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A 2.0-kg block slides on a rough horizontal surface. A force (magnitude P = 4.0 N) acting parallel to the surface is applied to the block. The magnitude of the block's acceleration is 1.2 m/s2. If P is increased to 5.0 N, determine the magnitude of the block's acceleration.
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A 25 cm focal length mirror has a 3.0 cm tall object placed 20 cm in front of it. Where is the image, and is it real or virtual?
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