Some of the energy produced when machines are used is chemical energy, and some energy is lost
What will be an ideal response?
This depends. Chemical reactions can take place in machines. In this case,
chemical energy can be produced. If no chemical reactions are used, then this is incorrect.
In all machines, some energy is "lost" to friction (thermal energy is generated).
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A step-up transformer doubles a primary voltage 110 V (ac). What is the ratio of the number of turns in its primary coil to those in the secondary coil?
A) 1:4 B) 4:1 C) 2:1 D) 1:2 E) 1:8
How can we best observe the Sun's chromosphere and corona?
A) The chromosphere is best observed with ultraviolet telescopes and the corona is best observed with X-ray telescopes. B) The chromosphere is best observed with infrared telescopes and the corona is best observed with ultraviolet telescopes. C) The chromosphere and corona are both best studied with visible light. D) The chromosphere and corona are both best studied with radio telescopes.
Why do we think Mercury contracted within about a billion years after it formed?
What will be an ideal response?
The figure is a graph of an object moving in a straight line. Solve graphically to determine which section of the path has the highest speed.
A. DE
B. EF
C. CD
D. AB