The oldest known fossils are
A) trilobites and brachiopods.
B) algae and bacteria.
C) fungi and algae.
D) worms and jellyfish.
Answer: B
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Two objects are dropped from a bridge, an interval of 1.0 s apart. Air resistance is negligible. During the time that both objects continue to fall, their separation
A) decreases. B) increases at first, but then stays constant. C) increases. D) stays constant. E) decreases at first, but then stays constant.
What are the two types of lava?
What will be an ideal response?
The four tires of an automobile are inflated to a gauge pressure of 2.0 × 105 N/m2 (29 PSI). Each of the four tires has an area of 0.024 m2 that is in contact with the ground. Determine the weight of the auto.
What will be an ideal response?
An EM wave with a wavelength of 500 nm will be visible
Indicate whether the statement is true or false