Strain-hardening in metals is due to
(a) A reduction in dislocation density due to dislocations running out of the crystals
(b) The creation of immobile dislocations by dislocation reactions
(c) A reduction in dislocation density by dislocation annihilation
(d) Foreign atoms pinning dislocations
(b) The creation of immobile dislocations by dislocation reactions
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If the mass of a cart is quickly loaded to have twice the mass while a propelling force remains constant, the cart's acceleration
A) quadruples. B) doubles. C) stays the same. D) halves. E) none of these
A 1.25-kg ball begins rolling from rest with constant angular acceleration down a hill. If it takes 3.60 s for it to make the first complete revolution, how long will it take to make the next complete revolution?
What will be an ideal response?
Which one of the following in not one of the drawbacks to the use of coal, i.e., which of the following is false?
A) We will run short on coal resources before long. B) Coal mining causes destruction of the land. C) Coal burning causes pollution. D) Coal burning contributes to the greenhouse effect thus heating Earth. E) Coal mining causes a large number of miner's deaths due to miner's diseases.
The heavier elements like iron and nickel are abundant on Earth's surface, and the silicates dominate at the center of Earth.
Answer the following statement true (T) or false (F)