Refracting telescopes use a mirror to gather and focus light
a. True
b. False
Indicate whether the statement is true or false
False
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LR Circuits: The figure shows a circuit. The ideal battery has a constant terminal voltage of ? = 27 V, the inductance is L = 0.40 H, and the resistances are R1 = 12 ? and R2 = 9.0 ?. Initially the switch S is open with no currents flowing. Then the switch is suddenly closed.(a) What is the current in the resistor R1 the instant after the switch is closed?(b) After leaving the switch has been closed for a very long time, it is opened again. Just after it is opened, what is the current in R1?
Fill in the blank(s) with the appropriate word(s).
In an adiabatic process:
A. the energy absorbed as heat equals the work done by the system on its environment B. the energy absorbed as heat equals the work done by the environment on the system C. the absorbed as heat equals the change in internal energy D. the work done by the environment on the system equals the change in internal energy E. the work done by the system on its environment equals to the change in internal energy
The pigments used in paints or dyes used on fabrics work by
A. selective absorption B. birefringence C. polarization D. interference
The largest component of municipal solid waste in the U.S. is
a. glass b. plastics c. paper d. yard waste e. metals