Explain the differences between composite and shield volcanoes
What will be an ideal response?
Composite volcanoes form above subduction zones where the descending crust melts and the magma rises to the surface. This forms chains of volcanos along the subduction zone. A shield volcano is formed by a highly fluid lava that flows easily and creates low-profile volcanic peaks with slopes of 3 to 10 degrees.
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Simple Pendulum: A pendulum of length L is suspended from the ceiling of an elevator. When the elevator is at rest the period of the pendulum is T. How does the period of the pendulum change when the elevator moves upward with constant velocity?
A. The period does not change. B. The period increases. C. The period decreases. D. The period becomes zero. E. The period increases if the upward acceleration is more than g/2 but decreases if the upward acceleration is less than g/2.
If the size of the charge value is tripled for one of two point charges maintained at a constant separation, the mutual force between them will be changed by what factor?
a. 3.0 c. 9.0 b. 1/9 d. 0.33
A proton is placed in an electric field of intensity 700 N/C
What are the magnitude and direction of the acceleration of this proton due to this field? (mproton = 1.67 × 10-27 kg, e = 1.60 × 10-19 C) A) 6.71 × 109 m/s2 opposite to the electric field B) 6.71 × 1010 m/s2 opposite to the electric field C) 6.71 × 1010 m/s2 in the direction of the electric field D) 67.1 × 1010 m/s2 opposite to the electric field E) 67.1 × 1010 m/s2 in the direction of the electric field
Stars that have ejected a planetary nebula eventually become
a. protostars. b. brown dwarfs. c. white dwarfs. d. red giants.