How did J. J. Thomson's experiments demonstrate that Dalton's model of the atom was incorrect? They showed that atoms have net negative charges.
They showed that atoms can be destroyed.
They showed that atoms are made up of smaller particles.
They showed that atoms have a dense nucleus.

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Identify the type of synthetic material used in each object

Astone is dropped with no initial velocity from the top of a cliff and hits the ground a time of 3.9 s later. what is the height of the cliff, in units of meters? you may assume that air resistance is negligible. give the answer as a positive number question 15 a figure skater is rotating at a rate of 200 revolutions per minute. what is the angular speed, in units of rad/s? 200 o 20.9 12000 o 3.33

What is the primary force that suspension bridges use cables to hold their spans up? a. tension force b. resistance force c. normal force d. elastic force e. applied force