Which of the following is true?
1.Dimensional analysis can never give you the numerical value of constants of proportionality that may appear in an algebraic expression, but it can sometimes give the proper mathematical forms for the variables (such as whether they are squared, multiplied by each other, divided by each other, added together, or subtracted from each other).
2.Dimensional analysis can sometimes give you the numerical value of constants of proportionality that may appear in an algebraic expression, and it can sometimes give the proper mathematical forms for the variables (such as whether they are squared, multiplied by each other, divided by each other, added together, or subtracted from each other).
3.Dimensional analysis can never give you the numerical value of constants of proportionality that may appear in an algebraic expression and it can never give the proper mathematical forms for the variables.
4.Dimensional analysis can sometimes give you the numerical value of constants of proportionality that may appear in an algebraic expression, but it can never give the proper mathematical forms for the variables (such as whether they are squared, multiplied by each other, divided by each other, added together, or subtracted from each other).
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A total of 2.0 × 1013 electrons pass a given point in a wire in 15 s. What is the current in the wire? (e = 1.60 × 10-19 C)
A) 0.21 ?A B) 3.2 ?A C) 1.3 mA D) 1.3 A
Describe the impact the discovery of extrasolar planets h as had on the question of life on other worlds
What will be an ideal response?
The standard model of particle physics predicts the existence of three families of elementary particles with four particles in each family. All of these particles have been confirmed experimentally except for the tau neutrino. Most physicists think the reason it has not been found is that
A. it likely does not exist. B. it is associated with the tau particle and the tau is difficult to trap. C. no current particle accelerator can generate enough energy to create a tau neutrino. D. neutrinos are very difficult to detect.
A Carnot engine operating between a reservoir of liquid mercury at its melting point (233 K) and a colder reservoir extracts of heat from the mercury and does of work during each cycle. What is the temperature of the colder reservoir?
A) 47 K B) 186 K C) 163 K D) 207 K