The planets never travel in a straight line as they orbit the Sun. According to Newton's second law of motion, this must mean that .
the planets will eventually fall into the Sun
a force is acting on the planets
the planets have angular momentum
the planets are always accelerating

Which branches of natural science include the study of an organism that lived 10 million years ago

It is reasonable to assume that the bulk modulus of blood is about the same as that of water (2.2 gpa). as one goes deeper and deeper in the ocean, the pressure increases by 10000 pa for every meter below the surface. if a diver goes down 80.0 m in the ocean, by how much does each cubic centimeter of her blood change in volume? give the answer in cubic centimeters (actually one cubic centimeter equals one milliliter).

Aparticle moves in a circle 1.50 m in radius . through what angle in radians does it rotate if it moves through an arc length of 2.50m? what is the angle in degrees?