The inclusion of all known dark matter still increased the density to only ________ of the critical density
Fill in the blank(s) with correct word
20-30%
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Triple pane window glass has been used in some building construction. Triple pane glass is a set of three glass panels, each separated by a sealed air gap. Estimate the R-Value for triple pane windows and compare this to the R-Value for single pane glass.
What will be an ideal response?
Which of the following properties of stars is directly observed (i.e., it can be measured by a calibrated instrument on a telescope, from a single observation without a need for additional calculations)?
A) luminosity B) radius C) surface temperature D) apparent brightness
The net force on any object in equilibrium is
A) zero. B) equal to its weight. C) less than its weight. D) non-zero when motion is involved.
Given that the charge on an up quark is +2/3 and the charge on a down quark is ?1/3, which combination represents a neutron?
A. uud B. udd C. uuu D. ddd