A stonecutter's chisel has an edge area of 0.7 cm2. If the chisel is struck with a force of 42 N, what is the pressure exerted on the stone?
A. 600 N/m2
B. 30,000 N/m2
C. 300,000 N/m2
D. 600,000 N/m2
E. 6000 N/m2
Answer: D
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According to current science, why didn't oxygen begin to accumulate in the atmosphere for more than a billion years after life appeared on the Earth?
A) Early forms of animal life consumed the oxygen released by plants during the first billion years of life on Earth. B) Early life did not release oxygen, and oxygen releasing organisms didn't evolve for a billion years after the earliest life. C) Oxygen was removed from the atmosphere by dissolving in the ocean as quickly as it was released by life. D) Oxygen was removed from the atmosphere by chemical reactions with surface rocks as quickly as it was released by life.
The deflection of one lithospheric plate under another is called
a. subduction. b. seafloor spreading. c. convergence. d. continental drift.
Transformers: An ideal transformer with 120 turns in its secondary supplies 12 V at 220 mA to a toy train. The primary is connected across a 120-V wall outlet.(a) How many turns are in the primary?(b) What is the primary current?(c) What power is delivered by the wall outlet?
What will be an ideal response?
The sedimentary rock known as ______________ consists of angular pebbles cemented together by silica, calcium carbonate, or iron oxide
a. conglomerate b. breccia c. limestone d. shale