If light spectra can be used to determine the elements in a star, how does this information about light spectra provide evidence for the Big Bang? (Spectral Lines 2)

James is trying to prove newton's 2nd law of motion. he tries to move four different objects with different masses, shapes, and sizes from point a to point b. the objects are a toy car, a car, a refrigerator, and a kitchen table. after some experimentation, he finds that force is dependent on the mass of the object, rather than it's size or shape. the object that takes the most force to move is the

How can a cyclist's acceleration change even if its velocity remains constant?

Whenever the net force on a moving object is zero its acceleration is