The formation of the Red Sea as Africa pulls apart from the Arabian peninsula is an example of what geological feature?
a. subduction zone
b. midocean rise
c. ocean spreading
d. rift valley
e. volcanic eruption
d
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Vision Problems: Mahmood is farsighted and cannot see objects clearly that are closer to his eye than 80.0 cm. What is the focal length of the contact lenses that will enable him to comfortably see objects at a distance of 25.0 cm from his eyes?
A. +36.4 cm B. -36.4 cm C. -21.2 cm D. +21.2 cm E. +32.5 cm
Resolution: A camera with a 20-cm diameter lens is recording images using a filter that allows only light of wavelength 600 nm to pass through.(a) What is the limit on the angular resolution (in microradians) in this case?(b) What is the diameter of the minimum-sized features that could be resolved on Mars with this camera? The distance to Mars at the time is 9.0 × 107 km.
What will be an ideal response?
Based on our current understanding of physics, we can understand the conditions that prevailed in the early universe as far back in time as about
A) 380,000 years after the Big Bang. B) one ten-billionth of a second after the Big Bang. C) 10-45 seconds after the Big Bang. D) 10 billion years ago.
A ceiling fan is turned on and reaches an angular speed of 132 rev/min in 20 s. It is then turned off and coasts to a stop in an additional 40 s. The ratio of the average angular acceleration for the first 20 s to that for the last 40 s is which of the following?
a. 6.6 b. 6.4 c. ?0.15 d. ?2.0