The chemical abundance of population I stars
a. indicates that they were formed before the population II stars.
b. indicates that the material they formed from had been enriched with material from supernovae.
c. indicates that they contain very few heavy metals compared to halo stars.
d. depends on the temperature of the star.
e. depends on the mass of the star.
b
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When a sphere falls freely through a homogeneous fluid, it reaches a terminal velocity at which the weight of the sphere is balanced by the buoyant force and the frictional resistance of the fluid. Make a dimensional analysis of this problem and indicate how experimental data for this problem could be correlated. Neglect compressibility effects and the influence of surface roughness.
GIVEN
A sphere falling freely through a homogeneous fluid
Terminal velocity occurs when weight is balanced by buoyant force and friction resistance of the fluid
FIND
Make a dimensional analysis and indicate how data may be correlated
ASSUMPTIONS
Compressibility effects are negligible
Influence of surface roughness is negligible
SKETCH
If the distance from the Sun to the Earth is represented by roughly 15 meters, then the distance from Earth to the Moon on the same scale would be
a. about 30 meters. b. about 10 meters. c. about 1 meter. d. small than your hand.
Planetary masses measured using the Doppler technique are lower limits to the possible planetary mass
Indicate whether the statement is true or false
Which will stay cooler for a longer time in a picnic cooler on a hot summer day?
A) sandwiches B) salami C) Jello