What are the two geological features that appear to set Earth apart from all the other terrestrial worlds?
A) plate tectonics and a high level of erosion
B) a dense core and plate tectonics
C) significant volcanism and tectonics
D) mantle convection and a thick atmosphere
A) plate tectonics and a high level of erosion
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Find the minimum diameter of a steel wire 18 m long that will stretch no more than 9 mm when a load of 380 kg is hung on the lower end. (Y steel = 2.0 × 1011 N/m2)
What will be an ideal response?
Equilibrium: If the sum of the external forces on an object is zero, then the sum of the external torques on it must also be zero.
A. True B. False
A steel guitar string with a diameter of 0.300 mm and a length of 70.0 cm is stretched by 0.500 mm while being tuned. How much force is needed to stretch the string by this amount? Young's modulus for steel is 2.0 × 1011 N/m2
What will be an ideal response?
True or False: People traveling near the speed of light relative to Earth would measure their lifespans and find them, on the average, longer than the average human lifespan as measured on Earth
1.False 2.True