What force causes riders to feel heavy and weightless on a roller coaster?

a. the force of gravity

c. the normal force

b. a combination of air resistance and friction

d. None of the above.

What is the equation for horizontal velocity

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

How does water flowing over a waterfall involve both kinetic energy and potential energy?

How many moles of oxygen are produced when 26.5mol of aluminum oxide are decomposed

How is gravity important to the galaxies within our universe? two sentences

Which group of hominids lived at the same time as Homo sapiens? a. australopithecines c. Homo habilis b. Homo erectus d. Neandertals

Which statements describe properties of stars check all that apply

Like magnetic poles will repel each other, while opposite magnetic poles will attract each other true or false

Why are newtons second and third law important to everyday life?

Which of these factors will increase the speed of a sound wave in the air