Which of the following geological processes has shaped the surface of the Earth?
A) plate tectonics
B) volcanism
C) erosion
D) all of these
D
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Which of the following wavelengths could NOT be present as a standing wave in a 2-m-long organ pipe open at both ends?
a. 4 m b. 2 m c. 1 m d. 0.89 m e. 0.5 m
A long straight metal rod has a radius of 2.0 mm and a surface charge of density 0.40 nC/m2 . Determine the magnitude of the electric field 3.0 mm from the axis
a. 18 N/C b. 23 N/C c. 30 N/C d. 15 N/C e. 60 N/C
Four identical particles (mass of each = 0.40 kg) are placed at the vertices of a rectangle (2.0 m × 3.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the moment of inertia of this rigid body about an axis that passes through the mid-points of the longer sides and is parallel to the shorter sides?
a. 2.7 kg/m2 b. 3.6 kg/m2 c. 3.1 kg/m2 d. 4.1 kg/m2 e. 1.6 kg/m2
A rectangular oven 1 m by 1 m by 1 m is heated from the bottom surface at 200ºC. If the top surface is 80ºC at a given time and the sides are assumed to be well insulated, determine the heat transfer through the oven.
What will be an ideal response?