Tycho Brahe's greatest contribution to astronomy was
a. his model of the universe.
b. his telescopic observations.
c. his discovery of three laws of motion.
d. his 20 years of careful observations of the planets.
e. a and b above
D
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What other recent hypotheses would corroborate the hypothesis that life on Earth originated in space? (Choose all that apply.)
A) amino acids forming DNA B) meteorites containing amino acids C) cometary impacts as the source of water on Earth D) early aerobic organisms created the oxygen in Earth's atmosphere E) the fossil record showing how biological organisms on Earth have changed over time
You are working in a library, reshelving books. You lift a book from the floor to the top shelf. The kinetic energy of the book on the floor was zero, and the kinetic energy of the book on the top shelf is zero, so there is no change in kinetic energy. Yet you did some work in lifting the book. Is the work-kinetic energy theorem violated?
1.Yes, it is violated because a force acting on the book should change the book's kinetic energy. 2.No, it is not violated because the book really does have a final velocity, but so does the entire system, so it is impossible to detect the book's motion. 3.Yes, it is violated because a force that acts on the book should change the book's velocity. 4.No, it is not violated because there are two forces that act on the book. One is the downward force that the Earth exerts on the book, which is counterbalanced by the upward force that you exert on the book. The total work done on the book, therefore, is zero, and is equal to its overall change in kinetic energy.
What is the rate of heat flow through a pane of glass that is 40.0 cm by 30.0 cm with a thickness of 4.00 mm
when the outside temperature is -10.0°C and the inside temperature is 25.0°C? The thermal conductivity of glass is 0.105 W/(m?K) and the specific heat of glass is 0.180 cal/(g?°C). A) 24.2 W B) 3.81 W C) 18.6 W D) 47.3 W E) 110 W
From a theoretical standpoint, what is a pulsar?
A) a star that alternately expands and contracts in size B) a rapidly rotating neutron star C) a neutron star or black hole that happens to be in a binary system D) a binary system that happens to be aligned so that one star periodically eclipses the other E) a star that is burning iron in its core