You need to make a sharp turn on a flat road, making a radius of curvature of 15 meters. How does the required force of static friction between your tires compare if you make the turn at 30 mph vs. 60 mph?
A) The force of friction needs to be four times as large.
B) The force of friction needs to be twice as large.
C) the force of friction is the same for both speeds since the radius of curvature is the same.
D) None of the above
A
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Modern mammals are descendants of
A) birds that were able to survive the impact that wiped out the dinosaurs 65 million years ago B) sea animals that colonized the land after the impact that wiped out the dinosaurs 65 million years ago C) early mammals that lived under the ground that were able to survive the impact that helped to wipe out the dinosaurs 65 million years ago D) early mammals that killed off the dinosaurs
If body M, with a positive charge, is used to charge body N by induction, what will be the nature of the charge left on the latter?
a. must be equal in magnitude to that on M b. must be negative c. must be positive d. must be greater in magnitude than that on M
Why are interstellar absorption lines so narrow compared to the width of lines which originate in the photospheres of stars?
What will be an ideal response?
Briefly describe two key pieces of evidence that support the Big Bang theory.
What will be an ideal response?