A rock of mass m is twirled on a string in a horizontal plane. The work done by the tension in the string on the rock is:

a. + (positive)

b. - (negative)

c. 0

What statement did Niels Bohr make about atoms?

2. Identify which condition is NOT a chronic disease a. diabetes c. heart b. cancer d. cold 3. Identify the single most important component of healt

A rock tied to the end of a string moves in a circle of radius 1.2m with a constant speed of 3.0 m/s. Calculate the centripetal acceleration of the rock.

How does the digestive system interact with the circulatory system? A. Nutrients and gases are absorbed by organs in the circulatory system. Then, they are transported to all parts of the body by organs in the digestive system. B.

4. Water is flowing at 12m/s in a horizontal pipe under a pressure of 600kpa radius 2cm. a. What is the speed of the water on the other side of 0.5cm radius? b. What is the pressure of the other side?

When studying atoms, scientists can ignore the blank force between charged particles that make up the atoms because it is many millions of times smaller than other forces in the atom

Burning involves a chemical change. true or false

What is the fate of the universe knowing that heat flow from hot to cold until there is equilibrium of temperature?

Limestone chips dissolve after they are placed in a beaker of dilute acid. Which geologic process is this most similar to?

In air an object weighs 15N. when immersed in water it weighs 12N. when immersed in another liquid it weighs 13N. determine the density of d object and that of d other liquid