The radii of two spheres are 2 cm and 4 cm, and they carry 1000 C and 2000 C charges, respectively. What will be the ratio of their surface charge density? a) 4:1
b) 1:2
c)1:4
d)2:1

Select the word from the list that best fits the definition classification of most stars on the h-r diagram

What are the three ways that an object can accelerate

Juan created a chart to him study for a test. which headings best complete the chart? x: transparent objects y: opaque objects x: opaque objects y: transparent objects x: high frequency waves y: low frequency waves x: low frequency waves y: high frequency waves