Two charged bodies separated by a distance d exert an electrical force on each other. The distance d is doubled. The electrical force on each body is now __________ times the original force
Fill in the blank(s) with correct word
1/4
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A ballerina spins initially at 1.5 revolutions/second when her arms are extended. She then draws in her arms to her body and her moment of inertia becomes 0.88 kg-m2 and her angular speed increases to 4.0 rev/s
Determine her initial moment of inertia.
How can you determine the distance to a spacecraft from the time it takes its radio signal to reach Earth?
What will be an ideal response?
The diagram below shows three approximate locations of the sun along the western horizon. Which number indicates the location of the sun at sunset on autumnal equinox for an observer at a latitude of 45° N?
a. 1
b. 2
c. 3
d. The sun will set in the east for an observer in the northern hemisphere.
e. The sun will not set on autumnal equinox at this latitude.
The rotation curve of a galaxy is important in determining the galaxy's ____
a. mass b. age c. luminosity d. type e. diameter