Which process(es) lead(s) to the gradual evolution of life via natural selection?
A) Changes that organisms acquire during their lives are passed on to their offspring.
B) Organisms tend to produce more offspring than the local environment can support.
C) Individuals vary in many heritable traits, and some will be better able to compete for resources at the given time and place in which they live.
D) A and B
E) B and C
F) A, B, and C
E
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Which of the following is TRUE?
a) It is possible for galaxies that are very distant to actually move through space ata speed several times the speed of light. b) A redshift occurs when a photon loses energy and slows down as itmoves through space. c) We see distant galaxies as they were billions or even tens of billions ofyears ago. d) We measure a redshift for roughly half of the galaxies that we observe, and for theothers we measure a blueshift. e) The center of the universe is located at a point about 200 Mpc from us in the centerof a cluster of galaxies.
An electric motor produces 2.0 hp in a Vrms = 120 V circuit. What is Irms for this motor? (1 hp = 746 W)
a. 12 A c. 0.62 A b. 6.2 A d. 1.6 A
A proton of mass m is at rest when it is suddenly struck head-on by an alpha particle (which consists of 2 protons and 2 neutrons) moving at speed v
If the collision is perfectly elastic, what speed will the alpha particle have after the collision? (Assume the neutron's mass is equal to the proton's mass.) A) zero B) 2v/3 C) 3v/5 D) 5v/3
How do the spectra of giants, supergiants, and main-sequence stars differ?
What will be an ideal response?