Is there enough luminous matter to stop the universe's expansion? Is there enough dark matter? What else is there?
What will be an ideal response?
There seems to be only about 1-3% of the amount of luminous matter needed to stop the expansion of the universe. With dark matter included, the number comes up to perhaps 20-30% (?o = .2-.3 ) of the amount needed, but still not enough. But the dark energy may in fact add in enough to give us a critical universe, with 73% of it in that new form.
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Which of the following actions will increase the de Broglie wavelength of a speck of dust? (There could be more than one correct choice.)
A) Decrease its momentum. B) Decrease its speed. C) Increase its speed. D) Decrease its mass. E) Increase its mass.
A bubble having a diameter of 1.00 cm is released from the bottom of a swimming pool where the depth is 5.00 m. What will the diameter of the bubble be when it reaches the surface? The temperature of the water at the surface is 20.0°C, whereas it is 15.0°C at the bottom. (The density of water is 1.00 × 10^3 kg/m3.)
a. 1.05 cm b. 1.15 cm c. 1.45 cm d. 1.65 cm e. 1.35 cm
What is the difference between 103.5 and 102.24?
A) 1 B) 1.3 C) 1.26 D) 1.260 E) 1.2600