Two lab partners are experimenting with two neutral objects: a glass beaker and a piece of animal fur. They rub the two together and the beaker becomes positively charged and the fur becomes
negatively charged.
How did the fur become charged?
O electrons were added to the fur
O protons were removed from the fur
electrons were removed from the fur
O protons were added to the fur

Amplitude is a measure of a waves a; speed b; distance c; energy d; frequency

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.

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?