Which of the following is a real piece of evidence (from the New Horizons mission) pointing to recent or ongoing geological activity on Pluto?
A) surface regions that suggest glacial movement of frozen ices of nitrogen and methane
B) surface regions that show evidence of flooding by liquid water
C) crater rims showing evidence of erosion by rainfall
D) several towering volcanoes discovered on its surface
A) surface regions that suggest glacial movement of frozen ices of nitrogen and methane
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An atom of the element iron has an atomic number of 26 and an atomic mass number of 56. If it is neutral, how many protons, neutrons, and electrons does it have?
A) 26 protons, 30 neutrons, 26 electrons B) 26 protons, 30 neutrons, 30 electrons C) 13 protons, 56 neutrons, 13 electrons D) 13 protons, 43 neutrons, 13 electrons E) 26 protons, 56 neutrons, 26 electrons
(a) Develop an equation for the time at which the plastic (viscous) strain is equal to the elastic strain in a Maxwell solid (series spring and dashpot) subject to a stress (?) where the viscous component is Newtonian (n=1).
(b) Determine the time (t) when the plastic strain is equal to the elastic strain in quartz subject to a stress of 35 MPa at 1250 K, if the viscosity is equal to 1014 Pa·s and the elastic modulus is equal to 70×109 Pa, assuming that the quartz behaves as a Maxwell solid. (c) Determine the total strain at the time (t).
Power: An electronic component with a 17-? resistor is rated for use at power levels not exceeding 14 W. How much current can safely flow through the component?
A. 0.91 A B. 1.21 A C. 238 A D. 0.22 A
The weak force that acts between an electron and a quark is caused by the exchange of
a. photons. b. gluons. c. gravitons. d. W+, W–, or Z0 bosons.