A student hangs a pith ball from a stand using thread and rubs a glass rod with silk cloth. Upon bringing the glass rod near the pith ball, the student observes that the pith ball is attracted towards the glass rod, as shown. How can the observation best be explained?
A. The glass rod exerts a gravitational force , causing it to attract the pith ball.
B. The pith ball exerts a replusion force towards the glass rod, causing the attraction
C. An electric field exists between the glass rod and the pith ball, causing the attraction
D. Electric charges in the string transfer to the pith ball, causing it to attract the glass rod.

What best describes a sonar wave? transverse and electromagnetic transverse and mechanical longitudinal and electromagnetic longitudinal and mechanical

Afigure skater is rotating at a rate of 200 revolutions per minute. what is the angular speed, in units of rad/s? 20.9 12000 200 3.33

Researchers determine that the biodiversity in a woodland region is declining. they identify two major threats to the region's biodiversity, a method to address each threat, and the expected outcome of each method. this information is shown in the table. a) reforestation would not benefit many species because most forest species live on the ground. b) reforestation would take the longest time to be effective because trees take several years to grow. c) biological augmentation would benefit only a few species because is is typically not very effective. d) biological augmentation would take less time to ve effective because it targets the majority of prey species.