A 2.3 cm tall statue is 15. cm in front of a convex mirror. The mirror radius of curvature is 18. cm

(a) Is the image real or virtual?
(b) How far is the image from the mirror?
(c) Is the image upright or inverted?
(d) How high is the image?


(a) virtual
(b) 5.6 cm
(c) upright
(d) 0.86 cm

Physics & Space Science

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The velocity of a particle as a function of time is given by v(t) = (2.3 m/s) + (4.1 m/s2)t - (6.2 m/s3)t2. What is the average acceleration of the particle between t = 1.0 s and t = 2.0 s?

A) -13 m/s2 B) -15 m/s2 C) 13 m/s2 D) 15 m/s2 E) 0 m/s2

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The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is 28 years

Suppose that samples of cobalt-60 and strontium-90 are such that they initially have the same activity (number of decays per second). What is true about the initial numbers of cobalt-60 and strontium-90 nuclei in these samples? A) There are equal numbers of cobalt-60 and strontium-90 nuclei. B) There are more cobalt-60 than strontium-90 nuclei. C) It is not possible to compare numbers of nuclei without knowing the masses of the samples. D) There are more strontium-90 than cobalt-60 nuclei.

Physics & Space Science

The two forms of electromagnetic radiation that penetrate the atmosphere best are:

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Physics & Space Science