North poles of magnets attract each other.

true or false

In a positive correlation, when one variable increases, the other variable

The pitch of a sound wave is its wavelength True or false

Which substance has the least density? A) an iceberg B) gallon of water C) a block of aluminum D) small piece of lead

What holds a moon in its orbit? A. the heat generated by the planet it orbits B. the gravitational pull of the star it orbits C. its own internal magnetism D. the gravitational pull of the planet it orbits

Critical thinking! Applying Concepts A desk exerts an upward force to support a computer resting on it. Does this force do work? Explain.

Why is friction between moving parts of machines undesirable?

What holds down earths atmosphere in its place?

A person catches a ball with a mass of 145 g dropped from a height of 60.0 m above his glove. His hand stops the ball in 0.0100 s. What is the force exerted by his glove on the ball? Assume the ball slows down with constant acceleration.

State the law of conservation of energy in your own ords

The malfunction indicator light in an OBD II system is flashing. Technician A says that this simply indicates a soft failure. Technician B says this means the problem could be damaging the catalytic converter. Who is right? A. Technician A only B.