A concave mirror has a radius of curvature of 1.0 m. An object is placed 2.0 m in front of the mirror. Determine the location of the image (in cm).

A. 130
B. 83
C. 67
D. 150
E. 200


Answer: C

Physics & Space Science

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Radioactive Decay: The half-life of a radioactive material is 4.5 days. How many days are required for a sample, with an initial activity of 1.0 × 105 Bq, to decay to an activity of 100 Bq?

A. 45 days B. 36 days C. 54 days D. 31 days

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A child pulls on a wagon with a horizontal force of 75 N. If the wagon moves horizontally a total of 42 m in 3.0 min, what is the average power generated by the child?

A) 18 W B) 22 W C) 24 W D) 27 W

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Which of these energy transformations best describes the overall operation of a hydroelectric power plant?

A) grav E ? therm E B) thermal E ? electromag E C) chem E ? electromag E D) grav E ? electromag E E) electromag E ? grav E

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Which of the following are not a common depositional feature of shoreline topography?

a. Barrier islands b. Pocket beaches c. Sea arches d. Spits

Physics & Space Science