An electric car is designed to run off a bank of 15-V batteries with total energy storage of 2.1 × 10^7 J. If the electric motor draws 4 200 W in moving the car at a steady speed of 14 m/s, how far will the car go before it is "out of juice?"
a. 35 km
b. 70 km
c. 140 km
d. 110 km
e. 18 km
b
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Each element has its own set of characteristic absorption lines because
a. the temperature of each element can varies. b. elements can exist in different forms of matter. c. electron energy levels differ for each element. d. each element has a different mass. e. absorption lines depend upon the speed of the object.
A total lunar eclipse is
a. visible only from the path of totality. b. visible only during a new Moon. c. visible to all observers on the side of Earth from which the Moon would be visible at that time. d. an opportunity to study the corona of the Sun. e. None of the other choices are correct.
A walker walks 30 m from the origin toward the EAST to point A. She then walks from point A 20 m more toward the EAST to point B. The walker's total displacement form the origin is
A. 50 m toward the EAST. B. 30 m toward the WEST. C. 20 m toward the WEST. D. 10 m toward the EAST. E. 10 m toward the WEST.
Suppose Mars had turned out to be significantly smaller than its current size, say about the size of our Moon. How would this have affected the number of geological features due to each of the four major geological processes?
What will be an ideal response?