A 2 kg apple is at rest on the floor at the bottom of a staircase. How much work would be necessary to bring that apple up to the top of the staircase which is 8 meters high? Answers:
16.0 J
160 J
64.0 J
640

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant

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.

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87