Which of the following is NOT true about a hypothesis?

A. It is an explanation for an observation

B. It must restate the question

C. It is testable

D. It can be written as an if/then statement

A sound wave traveling downward with a speed of about 4,000 m/s suddenly slows to 1,500 m/s not far below the Earth's surface.

A rubber bullet of mass m is fired from a rifle into a stationary block of 25 m. The bullet remains in the block and both the bullet and the block move off with a common velocity. Assume this is an inelastic collision in a closed system.

An ionic compound is not represented by a molecular formula because an ionic compound is

an object with a mass of 6.0 kg accelerates 4.0 m/s^2 when an unknown force is applied to it. what is the acceleration?

What is the speed of a wave that has a frequency of 173 hz and a wavelength of 2.59 meters?

A teacher has asked four students to state a scientific theory. Which student is correct?

What are the two main currents that affect the US on the east and west coast?

What role do volcanoes play in the flow of energy and cycling of matter on earth?

How does uniform linear motion differ from uniform circular motion?

A metal underground water pipe that is in direct contact with the Earth for? or more is a code-recognized as a grounding electrode and must be included in the grounding electrode system.