Why does silica content differ in each volcano?
What will be an ideal response?
It contains different types of lava with different characteristics
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A pair of parallel conducting plates have potentials of -17 V and 55 V, respectively. An electron is ejected from the plate at potential -17 V and travels to the plate at 55 V. What is the change in the electron’s potential energy as it makes this journey?
a. 
b. 
c. 
d. 
Which of the following statements about electron degeneracy pressure and neutron degeneracy pressure is true?
A) The life of a white dwarf is an ongoing battle between electron degeneracy pressure and neutron degeneracy pressure. B) Both electron degeneracy pressure and neutron degeneracy pressure help govern the internal structure of a main-sequence star. C) Electron degeneracy pressure is the main source of pressure in white dwarfs, while neutron degeneracy pressure is the main source of pressure in neutron stars. D) In a black hole, the pressure coming from neutron degeneracy pressure is slightly greater than that coming from electron degeneracy pressure.
An object 4 cm high is placed 15 cm in front of a convex mirror with a focal length of -10 cm. What is the image position (in cm)?
a. -8 b. -4 c. -2 d. -6 e. 30
Under steady state conditions, a piece of wood 350 mm by 350 mm and 15 mm thick conducts heat through its thickness and loses no appreciable heat through its well-insulated sides
The rate of heat flow is measured to be 14.0 W when the temperature difference across its thickness is 28°C. Determine the thermal conductivity of this wood. A) 9.2 × 10-4 W/(m ? °C) B) 270 W/(m ? °C) C) 16 W/(m ? °C) D) 0.061 W/(m ? °C) E) 33 W/(m ? °C)