A nearsighted physicist cannot see things clearly beyond 90 cm from her eyes. What is the power of the contact lenses that will enable her to see very distant objects clearly?
A) 1.1 diopters
B) -1.1 diopters
C) -1.7 diopters
D) -2.2 diopters
E) 2.2 diopters
B
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A 50-cm3 block of wood is floating on water, and a 50-cm3 chunk of iron is totally submerged in the water. Which one has the greater buoyant force on it?
A) the wood B) the iron C) Both have the same buoyant force. D) It cannot be determined without knowing their densities.
The splitting of a large nucleus into two smaller nuclei upon absorbing a neutron is nuclear fusion
Indicate whether the statement is true or false
When is the soonest we are likely to have moderate-resolution images and spectra of Earthlike planets around other stars?
A) in a decade or two, through space observatories now in the early planning stages B) in just a few years, through analysis of observations by the GAIA mission C) any day now, thanks to our largest ground-based telescopes D) in just a few years, through analysis of observations by the James Webb Space Telescope
The density of lead is greater than that of iron, and both are denser than water. Compared to a solid iron object of the same dimensions, the buoyant force acting on a solid lead object is be
1.greater. 2.equal. 3.less.