Historic communication methods You will find the names of five communication methods below. What year was it invented?
Year
Image
Name
Email
Semaphore
Telegram
Homing/Carrier pigeon
Telephone
Rom

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only #2 represents an object at rest on a table.

in #1, there is no normal force due to the table; the object is accelerating downward.

in #3, the vertical forces are not balanced; the object is accelerating downward.

in #4, neither the vertical nor the horizontal forces are balanced. the object is accelerating upwards and to the right.