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%

Physics & Space Science

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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?

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

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.

Physics & Space Science