A 1000-kg car is picking up speed as it goes around a horizontal curve whose radius is 100 m. The coefficient of static friction between the tires and the road is 0.350. At what speed will the car begin to skid sideways?
A) 9.25 m/s
B) 23.6 m/s
C) 34.3 m/s
D) 35.0 m/s
E) 18.5 m/s
E
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What similarity did Isaac Newton perceive between a falling apple and the moon?
A) The velocities of both are directed toward Earth's center.
B) Both have a velocities and accelerations directed toward Earth's center.
C) Both have accelerations directed toward Earth's center, although the forces on them are in different directions.
D) Both have forces on them toward Earth's center, and accelerations directed toward Earth's center.
E) Both have forces on them toward Earth's center, but their accelerations are in different directions.
Reflection nebula are bluer than the stars that illuminate them. The Earth's sky is bluer than the Sun. Is this a coincidence? Explain why or why not
What will be an ideal response?
The rate at which air temperature changes with altitude is called
a. the inversion rate. b. vertical development. c. the lapse rate. d. an isotherm.
In a folded sequence of rocks we find younger rocks at the axis of the fold and older rocks away from the fold axis. The fold is
A) called a syncline. B) called an anticline. C) plunging. D) tilted.