When a 20.8-? resistor is connected across a 15.6-V battery, a current of 500 mA flows. What is the internal resistance of the battery?
a. 20.8 ?
b. 10.4 ?
c. 31.2 ?
d. 0.732 ?
e. 1.25 ?
b
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______________are materials that are made out of polymers plus additives.
Fill in the blank(s) with the appropriate word(s).
In which wavelength region(s) would we need to carry out observations in order to study the accretion disk around a white dwarf in a binary system?
A) visible light B) ultraviolet light C) X-ray light D) A and B E) B and C
If a satellite travels at constant speed at all points in its orbit, then its path is
1) a circle. 2) an ellipse. 3) a parabola. It travels at constant speed because 4) the net force acting on the satellite is zero. 5) it is characteristic for a satellite to travel at constant speed in this type of orbit. 6) gravitational force decreases with increasing distance. 7) there is no component of gravitational pull directed along the satellite's path. 8) of inertia.
Power: How much energy does a 100-W light bulb use in 8.0 hours?
A. 0.0080 kWh B. 0.80 kWh C. 13 kWh D. 800 kWh