What does an astronomer need to understand the fundamentals of to be able to calculate the age of the universe? Group of answer choices

propulsion physics (e. g., explosions)

how gravity is related to mass

how matter decays over time

the nature of visible light

To run the physics cart, the fan speed of the cart is manipulated. this is the (blank) variable. the cart accelerates due to the speed of the fan. acceleration is therefore the (blank) variable. a “constant” is a parameter that stays the same regardless of the variables. one parameter of the cart that is held constant is the (blank) .

Consider two regions of space containing a static electric field, region a and region b. in region a the equipotential lines are more closely spaced than those in region b. what can be said about the relative strength of the electric field in the two regions? a) the electric field in region a is stronger th

Which form of cell division creates the sperm and egg, resulting in half of the chromosomes as the other cells?