The radius of the path of an object in uniform circular motion is halved. the centripetal acceleration needed if its speed remains the same is
half as great
the same as before
twice as great as before
four times as great as before

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?

Earth's atmosphere is composed of mostly two gases. name the two gases that make up the majority of the atmosphere and use the pie chart to tell the percentages of each.

Which is an advantage of subdividing science into different areas?