Photosynthesis was a great step forward in the evolution of life on Earth, because with photosynthesis_____________________.
Fill the blank(s) with correct word
Answer: Life could extract chemical energy from sunlight
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The celestial sphere is
A) the central spherical region of the Milky Way Galaxy, dense with stars. B) a spherical galaxy, centered on the Sun. C) a useful illusion used to map the stars and other objects in the sky. D) the star-sphere discovered by the Greeks and other ancient civilizations which shows the physical location in space of the nearby stars. E) another name for our spherical Sun.
A camper carries her drinks in an ice chest made of styrofoam. The chest is 40 cm × 45 cm × 70 cm, and the walls and lid are 2.5 cm thick
The contents of the chest are ice, water, cans of soft drinks, and other food, all of which are in thermal equilibrium with the ice water. The temperature just outside the ice chest is 35°C. What is the rate of heat flow through the walls of the box? The thermal conductivity of styrofoam is 0.010 W/(m•K). A) 14 W B) 16 W C) 18 W D) 20 W E) 22 W
An LRC ac series circuit with R = 15 ?, L = 25 mH, and C = 30 ?F, is attached to a 100-V (rms) ac power supply. The frequency of the power supply is adjusted so that the circuit is in resonance
(a) What is the rms current in the circuit? (b) What is the power dissipated by the circuit?
A mass is transferred through the inner Langragria point in a binary system toward a white dwarf, the material forms a rapidly growing whirlpool of material known as a(n)
a. accretion disk. b. Lagrangian point. c. Algol paradox. d. planetary nebula. e. supernova remnant.