Author Question: Physics could best be described as the study of A) atoms in motion. B) matter. C) the general ... (Read 55 times)

strangeaffliction · **on:** Jul 29, 2018

Physics could best be described as the study of

A) atoms in motion.
B) matter.
C) the general principles underlying natural phenomena.
D) the application of science to the needs of human beings.
E) the absolute, or certain, truths about the natural world.

Question 2

A 910-kg object is released from rest at an altitude of 1200 km above the north pole of the earth. If we ignore atmospheric friction, with what speed does the object strike the surface of the earth?

(G = 6.67 10-11 N m2/kg2, Mearth = 5.97 1024 kg, the polar radius of the earth is 6357 km)
A) 4.5 km/s
B) 2.2 km/s
C) 2.7 km/s
D) 3.2 km/s
E) 4.8 km/s