A piece of soft iron is placed in a solenoid increasing the magnetic field in an arrangement that can be switched on and off. Such a device is called
A)
an electromagnet.
B)
an electrosolenoid.
C)
a permanent magnet.
D)
a ferromagnet.
E)
a hysteresis loop.
A
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A film of index of refraction n1 coats a surface with index of refraction n2. When n1>n2, the condition for constructive interference for reflected monochromatic light of wavelength ? in air is
A.
.B.
.C.
.D.
.E.
.Suppose that you are isolated and "floating" in outer space and that you hold a wooden block and a lead block, one in each hand, and that the two blocks look and feel identical. How could you tell which one is the lead block?
A) Give each one a light tap with your finger; the one that accelerates the least is the lead block. B) Let go of them; the one that falls the fastest is the lead block. C) Give each one a light tap with your finger; the one that accelerates the most is the lead block. D) None of the above methods could tell you which block is the lead block.
What are gravitational waves?
A) a type of energy that is different from light and that has been detected from sources such as merging neutron stars and black holes B) a form of light with higher energy than gamma rays C) a form of light with lower energy than radio waves D) the name we give to electromagnetic waves that come from astronomical objects that have gravity
The electric arc furnace uses ___________% scrap steel.
Fill in the blank(s) with the appropriate word(s).