The presence of a Mercurian magnetic field surprised the planetary scientists on the Mariner 10 team because
A) Mercury is low in iron.
B) Mercury spins too rapidly to produce a stable dynamo.
C) it's still too hot for its core to have differentiated.
D) the dynamo theory predicted that Mercury was spinning too slowly for one.
E) Mercury lacks an iron core.
D
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An iceboat is traveling in a circle on the ice. Halfway around the circle the sail and the steering mechanism fall off the boat. Which statement is correct?
a. The boat will continue traveling in the circle because there is no friction. b. The boat will continue to travel in the circle because its velocity exerts a force on it. c. The boat will move off on a line tangent to the circle because there is no force on it. d. The boat will move off tangent to the circle because there is a force on it perpendicular to the boat directed to the outside of the circle. e. The boat will move off to the outside perpendicular to the tangent line since a force directed to the outside of the circle always acts on the boat.
Why might increasing the temperature alter the rate of a chemical reaction?
A) The molecules will have a higher kinetic energy and bump into one another harder. B) The molecules are less reactive at higher temperatures. C) The molecules will more likely combine with other atoms at high temperature to save space. D) The density decreases as a function of temperature and this leads to an increase in volume which drops the rate of reaction. E) none of the above
The laws of thermodynamics can be related to the following: (i) the measurement of temperature, (ii) the lowest temperature possible, (iii) conservation of energy, and (iv) only part of heat energy available may be turned into work. Which of these involve the first and second law?
a. (i) and (ii) c. (i) and (iii) b. (ii) and (iv) d. (iii) and (iv)
A neutron can be described as all of the following except: