An echo is heard when sound is reflected off a surface. Which of the following best explains this phenomenon?

Three resistors having resistances of LaTeX: 4.0/; /Omega4.0 Ω, LaTeX: 6.0/; /Omega6.0 Ω, and LaTeX: 10.0/; /Omega10.0 Ω are connected in parallel. If the combination is connected in series with an ideal 12-V battery and a LaTeX: 2.0/; /Omega2.

What is the average mass of a neutron? A. 1 amu B. 1,837 amu C. 1/1,837 amu

When heated a solution of carbonic acid yields carbon dioxide gas and water vapor. Classify this reaction. H2CO3 (aq) → CO2 (g) + H2O (g) A) Synthesis B) Decomposition C) Double Replacement D) Single Replacement

What is one reason that writing clear step-by-step procedures is important? A. It prevents you from faking results. B. It makes repetition and replication easier. C. It makes sure that no one copies your work. D.

What happens to the atoms in the reactants during a chemical reaction

Acceleration is a scalar quantity true or false

Find a numerical value for rhoearth, the average density of the earth in kilograms per cubic meter. Use 6378km for the radius of the earth, G=6.67*10-11m3 / (kg⋅s2), and a value of g at the surface of 9.80m/s2.

The driver of a car traveling at 32 m/s applies the brakes and undergoes a constant deceleration of 2.25 m/s^2.

The ability of an object to vibrate by absorbing energy at its natural frequency is called?

A hurricane in the Gulf of Mexico to 15 hours to travel 360 kilometers. What is the average speed of this hurricane in kilometers per hour?