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
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
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.