What is a planetary nebula?
A) The bipolar jets ejected by a T Tauri variable
B) A planet surrounded by a glowing shell of gas
C) The disc of gas and dust surrounding a young star that will soon form a solar system
D) The ejected envelope, often bipolar, of a red giant surrounding a stellar core remnant
E) A type of young, medium mass star
D
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Weight and g: Two planets have the same surface gravity, but planet B has twice the radius of planet A. If planet A has mass m, what is the mass of planet B?
A. m/
B. m
C. m
D. 4m
E. m/4
Compared to the critical density of matter, about how much matter and dark energy is there?
A) 1% matter, 99% dark energy B) 99% matter, 1% dark energy C) 100% matter, 0% dark energy D) 30% matter, 70% dark energy
Vision Problems: A person is nearsighted with a far point of 75.0 cm.(a) What focal length contact lens is needed to give him normal vision?(b) What is the power of the corrective lens?
What will be an ideal response?
Two resistors of 5.0 and 9.0 ? are connected in parallel. A 4.0-? resistor is then connected in series with the parallel combination. A 6.0-V battery is then connected to the series-parallel combination
(a) What is the current through the 4.0-? resistor? (b) What is the current through the 5.0-? resistor? (c) What is the current through the 9.0-? resistor?