4-kg mass at the Earth's surface weighs about Newtons. Bo red who wan na ta lk

40N

Explanation:

1 kg = 10 N

1×4=10N×4

4kg=40N

4kg of mass at the earths surface would be about 40 newtons

Explanation:

micro/nanoscale topography surface exhibits many prominent properties and is extensively employed in biomedical device, microfluidic device and energy device fabrication. additionally, the clinical applications of biomaterials can be largely expanded with of nanostructured surfaces.

i believe the answer is c