Which of the following is an example of convection?

the rays of the Sun warming the earth

a hot oven warming the air around it

a hot object transferring heat to a cooler one

hot air rising and cooler air falling

The outer shell electrons in metals are not tightly bound to the nuclei of their atoms they are free to roam throughout the material moving from atom to atom these materials are good

Which part of the telescope reflects light to the eyepiece

While standing on a bridge 40.0 m above the ground, you drop a stone from rest. when the stone has fallen 3.80 m, you throw a second stone straight down.

In this lab you will be given two polaroid sheets with unlabeled transmission axes. How can you tell, when looking through both polaroid sheets at the same time, if the transmission axes are crossed? 1.

Which condition will cause the pressure exerted by a gas in a closed container to increase? a. an increase in volume b. an increase in temperature c. a decrease in molecular movement d. a decrease in the number of gas molecules

An acrobatic airplane performs a loop at an airshow. The centripetal acceleration the plane experiences is 14.7 m/s2. If it takes the pilot 45.

Which of the following was NOT an outcome of Bacon's rebellion? A. A more direct focus on the "Indian Problem" B. A more focused plain to isolate black slaves from white servants C.

A science class did an investigation to see how many breaths it took for each student to blow up a balloon. Jason blew up his balloon with the fewest breaths. Which of these might explain why Jason took fewer breaths to blow up his balloon? A.

How the behavior of waves is affected by a medium

Suppose the gravitational force between two spheres is 100 N. If the distance between the spheres is halved, what is the new gravitational force between them?