An effective theory must
A) have been proven.
B) must have been around for centuries or longer.
C) be continuously tested.
D) include mathematical formulae.
C
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Acceleration: Suppose that a car traveling to the west begins to slow down as it approaches a traffic light. Which of the following statements about its acceleration is correct?
A. The acceleration is toward the east. B. Since the car is slowing down, its acceleration must be negative. C. The acceleration is zero. D. The acceleration is toward the west.
Work-Energy Theorem: A 10-kg dog is running with a speed of 5.0 m/s. What is the minimum work required to stop the dog in 2.40 s?
A. 50 J B. 75 J C. 100 J D. 125 J
A car moving at a steady 10 m/s on a level highway encounters a bump that has a circular cross-section with a radius of 30 m. The car maintains its speed over the bump
What is the normal force exerted by the seat of the car on a 60.0-kg passenger when the car is at the top of the bump? A) 200 N B) 390 N C) 790 N D) 490 N E) 590 N
From a chemical energy standpoint, the basic requirement for life is a situation in which chemicals naturally exist in a state of
A) instability B) disequilibrium C) equilibrium D) stability