A 10 solar mass star is about ten times more luminous than a 1 solar mass star
Indicate whether the statement is true or false
FALSE
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In a nuclear fusion reactor, the Lawson criterion prescribes the necessary conditions, as related to density and confinement time of the plasma fuel, in order that the process produces a net power output. If the fuel density were doubled, by what factor would the required confinement time change?
a. 0.25 b. 0.50 c. 1.4 d. 2.0
Collisions in Two Dimensions: A 900-kg car traveling east at 15.0 m/s suddenly collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together after the collision. In what direction does the wreckage move just after the collision?
A. 36.9° N of E B. 42.0° N of E C. 45.0° N of E D. 53.1° N of E E. 48.0° N of E
Some food costs may rise in the future as a consequence of the increased use of which food-based fuel?
a. Ethanol b. Gasoline c. Oil d. Coal
Virtually all the carbon-rich dust in the plane of the galaxy originated in
A) low-mass stars. B) planetary nebulae. C) high-mass stars. D) brown dwarfs. E) white dwarfs.