Which of the following is not evidence for dark matter?
A) the flat rotation curves of spiral galaxies
B) x-ray observations of hot gas in galaxy clusters
C) gravitational lensing around galaxy clusters
D) the expansion of the universe
D) the expansion of the universe
Physics & Space Science
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When the equation Al + O2? Al2O3 is balanced, the coefficient of O2 is
a. 1 b. 2 c. 3 d. 4
Physics & Space Science
What forms of electromagnetic radiation from the Sun's emissions do we experience here on Earth? Illustrate how we know this to be the case with one practical example for each form
What will be an ideal response?
Physics & Space Science
Drive-by-wire has the potential to decrease gas mileage
What will be an ideal response?
Physics & Space Science
When vapor transforms to a plasma, energy must be
A) absorbed by the vapor. B) released from the vapor. C) both of these D) neither of these
Physics & Space Science