When does a star reach equilibrium?
a. when it no longer produces any antimatter
b. when the amount of hydrogen equals the amount of helium
c. when gravity is balanced by the outward force of nuclear fusion
d. when it reaches the point where nuclear fusion is about to begin

What would be the strength of earth's gravitational field at a point where an 80.0 kg astronaut would experience a 80% reduction in weight

If anyonee has done the momentum lab practical in physics can you give me the answers i am s lostt rnn : (

In this lab you will use a cart and track to explore various aspects of motion. you will measure and record the time it takes the cart to travel certain distances, and then complete some calculations. in the space below, write a scientific question that you will answer by doing this experiment.