Which statement correctly describes the role of dark matter in galaxy formation?
A) Where baryons collect, dark matter follows.
B) Dark matter plays very little role in galaxy formation.
C) Where dark matter collects, the baryons follow.
C
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Two masses m1 and m2, are separated by a distance r. The forces of attraction between the two masses is F.
a. if m1 is doubled, how does F change? b. if neither of the masses were changed, but r was doubled, how would F change? c. if r was not changed but both masses were doubled, how would F change? d. if r was halved and both masses were doubled, how would F change?
The unit of work is:
a. the newton. b. the meter. c. the slug. d. the hour. e. the joule.
A 100%-efficient engine is being used to raise a 89-kg crate vertically upward at a steady rate
If the power output of the engine is 1620 W, how long does it take the engine to lift the crate a vertical distance of 18.7 m? Friction in the system is negligible.
Stellar spectra started with the amount of hydrogen found in the star's spectrum and started with the letters A through Q. What are the current letters used to classify stellar spectra?
What will be an ideal response?