19. Jupiter and Saturn are both mainly composed of: helium and hydrogen. nitrogen and carbon dioxide. neon and freon. carbon and silicon.

In what way does the similarities and differences contradict or support previous accounts of atom models?

True or False:An object is weightless because it is in freefall. ) False True

Two charges with magnitude Q experience a force F when held a distance r apart. What is the force between two charges of magnitude 2Q held a distance 2r apart? $F/2$ 4F $F/4$ F 16F

Abrupt changes in dynamic levels between loud and soft A graded dynamics B leveled dynamics C terraced dynamics D abrupt dynamics

How does physics benefit our daily lives? Physicists map moon patterns to provide data on crop growth cycles. Physicists study ailments such as kidney disease and arthritis. Physicists study agriculture. Robotics and lasers are used in medicine and industry.

Fill in the Blank Question To produce a $\square $ wave, the two periodic waves must be traveling in opposite directions.

Eclipses happen many times each year. A True B False

Multiple Select Question Select all that apply When waves travel through a medium, which of the following have a net displacement? A longitudinal wave A transverse wave A wave pulse The medium itself

The stars within a constellation do not stay in fixed positions relative to each other during human lifetimes. A ) True B False

What does nuclear fusion in stars create? Chemical compounds Black holes New elements Asteroids