To be dimensionally consistent, velocity [L/T], force mass [M], and length [L] must be related as follows.

A.

B.

C.

D. velocity = force length/mass


A.

Physics & Space Science

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To what radius would the sun have to be compressed in order for it to become a black hole? The mass of the sun is 1.99 × 1030 kg, G = 6.67 × 10-11 N ? m2/kg2, and c = 3.00 × 108 m/s

A) 2950 m B) 1470 m C) 6.96 × 108 m D) 2.66 × 106 m E) 3.72 × 104 m

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Why might the following nuclear reaction not be very good for energy production in a fission reactor?

A) The material only produces one neutron so the chain reaction will not be very efficient. B) The products are too large. C) There are too many products produced. D) The mass of the byproducts is too high and therefore the energy released will not be high enough. E) Interatomic attraction between the products will impede the efficient separation of the atoms from the unstable nuclei.

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The temperature of an object from which no heat energy can be extracted is

a. 0° F. b. 0° C. c. 0 K. d. 100 K. e. 100° C.

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One of the lines of Hydrogen has a wavelength of 121.6 nm. If a cloud of Hydrogen gasis moving TOWARDS us at 200km/s, what will we detect?

a) An emission line in the cloud's spectrum with a wavelength shorter than 121.6 nm. b) An emission line in the cloud's spectrum with a wavelength longer than121.6 nm. c) An emission line in the cloud's spectrum with a wavelength of exactly 121.6 nm. d) This cloud will not emit a spectrum at all. e) A continuous spectrum with an absorption line at exactly 121.6 nm.

Physics & Space Science