How small a time interval is needed for a good calculation of instantaneous speed?
a. Instantaneous speed is calculated for a single instant.
b. Three days is small enough.
c. Use the longest interval of travel to avoid numerical error.
d. An interval short enough so that the answer won't change very much if you use a shorter one.
e. A single second is short enough.
d
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Absolute visual magnitude is the:
A) apparent magnitude of a star observed from Earth. B) luminosity of a star observed from a distance of 1000 pc. C) apparent magnitude of a star observed from a distance of 10 pc. D) luminosity of a star observed from Earth.
Sunspots are only about 2,000 K cooler than the much brighter photosphere
Indicate whether the statement is true or false
The site from which an airplane takes off is the origin. The x axis points east; the y axis points straight up. The position and velocity vectors of the plane at a later time are given by
?
m and 
m/s.
?
The plane is most likely
A. just touching down. B. in level flight in the air. C. ascending. D. descending. E. taking off.
A long cylindrical conductor (radius = 1.0 mm) carries a charge density of 4.0 pC/m and is inside a coaxial, hollow, cylindrical conductor (inner radius = 3.0 mm, outer radius = 4.0 mm) that has a total charge of ?8.0 pC/m. What is the magnitude of the electric field 2.0 mm from the axis of these conductors?
a. 24 N/C b. 18 N/C c. zero d. 36 N/C e. 226 N/C