If at least one component of a vector is a positive number, the vector cannot
1.have three dimensions.
2.be zero.
3.have any component that is negative.
4.None of these choices is correct.
2
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If the natural log of the viscosity is plotted as a function of the inverse of the absolute temperature, the slope of the line is equal to the _________of activation for plastic strain divided by Boltzmann’s constant.
Fill in the blank(s) with the appropriate word(s).
Conduction: A solid concrete wall has dimensions 4.0 m × 2.4 m and is 30 cm thick. The thermal conductivity of the concrete is 1.3 W/m ? K, and it separates a basement from the ground outside. The inner surface of the wall is at 18°C, and the outside surface is at 6°C. How much heat flows through the wall every hour?
A. 1.8 MJ B. 1.8 kJ C. 500 J D. 5.0 MJ E. 5.0 kJ
Angular momentum cannot be conserved if
A) the angular acceleration changes. B) the angular velocity changes. C) there is a net force on the system. D) the moment of inertia changes. E) the net torque is not zero.
What gets left behind in the middle of a planetary nebula?
A.) A newborn star. B.) A white dwarf. C.) A neutron star. D.) A black hole. E.) None of the above.