The force you have to overcome to start an object moving is

a. rolling friction b. static friction

c. sliding friction d. air resistance

Which number is 0.0069 expressed in scientific notation? 6.9 * 104 6.9 * 10-6 6.9 * 10-4 6.9 * 10-3

How do atoms become ions explain which characteristics change in which stay the same during this transformation

In a mass spectrometer, ions are directed into a magnetic field, where they curve and strike a detector.

In a laser, electrical energy is changed to light energy, and a small amount of the energy is wasted as heat. Describe the total amount of the heat in the system (using the conservation of energy).

What is the meaning of the phrase "grand unified theories" when applied to particle physics and cosmology?

Let's say you had a pulley system with a mechanical advantage of 3. If you want to lift a boulder 10 meters off the ground, how far would you have to pull the rope?

For glass fragments to be individualized, what must be true? A. They must fit together B. They must have the same density C. They must look the same D. They must be the same color

In what way would a digital thermometer be preferable to those from a liquid-based thermometer? Digital thermometer readings are easier to use when performing calculations.

Why does the core of the sun contain more helium and less hydrogen than the surface of the sun?

What happens to a light ray passing through the center of a lens?