Free Fall: Abby throws a ball straight up and times it. She sees that the ball goes by the top of a flagpole after 0.50 s and reaches the level of the top of the pole after a total elapsed time of 4.1 s. What was the speed of the ball at launch? Neglect air resistance.
A. 11 m/s
B. 23 m/s
C. 34 m/s
D. 45 m/s
E. 48 m/s
Answer: B
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The precision and number of significant figures in 0.0045 mm is
A. precision = .0001 mm, significant figures = 4. B. precision = .001 mm, significant figures = 4. C. precision = .0001 mm, significant figures = 3. D. precision = .001 mm, significant figures = 3. E. precision = .0001 mm, significant figures = 2.
When a car goes around a circular curve on a level road without slipping,
A. no frictional force is needed because the car simply follows the road. B. the frictional force of the road on the car increases when the car's speed decreases. C. the frictional force of the road on the car increases when the car's speed increases. D. the frictional force of the road on the car increases when the car moves to the outside of the curve. E. there is no net frictional force because the road and the car exert equal and opposite forces on each other.
Potential of Point-Charges: A +4.0-?C and a -4.0-?C point charge are placed as shown in the figure. What is the potential difference between points A and B? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 48 V B. 96 V C. 0 V D. 96 kV E. 48 kV
How do terrestrial and giant planets differ? List as many ways as you can think of.