Estimation: A marathon race is 26 mi and 385 yd long. Estimate how many strides would be required to run a marathon. Assume a reasonable value for the average number of feet/stride.
A. 4.5 × 104 strides
B. 4.5 × 103 strides
C. 4.5 × 105 strides
D. 4.5 × 106 strides
Answer: A
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Free Fall: To determine the height of a flagpole, Abby throws a ball straight up and times it. She sees that the ball goes by the top of the pole after 0.50 s and then reaches the top of the pole again after a total elapsed time of 4.1 s. How high is the pole above the point where the ball was launched? Neglect air resistance.
A. 10 m B. 13 m C. 16 m D. 18 m E. 26 m
A proton and an electron are released from rest, with only the electrostatic force acting. Which of the following statements must be true about them as they move toward each other? (There could be more than one correct choice.)
A) Their acceleration keeps decreasing. B) Their kinetic energy keeps increasing. C) Their electric potential energy keeps decreasing. D) Their kinetic energy keeps decreasing. E) Their electric potential energy keeps increasing.
Determine R when I = 0.20 A and ? = 18 V
a.
50 ?
b.
8.0 ?
c.
10 ?
d.
20 ?
e.
30 ?
The rings of Uranus were discovered from Earth when the planet passed in front of a star
Indicate whether the statement is true or false