For convection to occur,

A. dark objects are required to absorb energy.

B. substances must be in contact with each other.

C. particles must be able to flow within a substance.

D. heat must transfer from an area of less energy to more energy.

A boy and a girl are riding a merry-go-round which is turning at a constant rate. the boy is near the outer edge, while the girl is closer to the center. who has the greater tangential acceleration?

You are in IMC and have two-way radio communications failure. If you do not exercise emergency authority, what procedure are you expected to follow?

Every object that has mass attracts every other object with a gravitational force. It has been proven that the size of the gravitational force increases as the objectsÍ masses increase but graviational force decreases rapidly as the distance between

A toy car is placed at 0 On a number line. It moves 9 cm to the left, then 4cm to right, and then 6cm to the left. The total distance the toy car traveled is

How does the speed of a sound wave change as the medium through which it traveks changes?

Which of the following objects would have the most inertia? A. A sphere with a radius of 5 cm and a mass of 34 grams. B. A sphere with a radius of 4 cm and a mass of 15 grams. C. A sphere with a radius of 8 cm and a mass of 27 grams. D.

A boy slides a book across the floor using a force of five and over a distance of 2M what is the kinetic energy of the book after he slides at assume there is no friction

Where would aliens be if they really do exist here on Earth?

If the mass of an object is 84g and the volume is 12cm3 what is the density

Describe one example of competiton of tropical dry forest