The hammering on a train track is often heard twice by workers farther down the track; first as the sound travels through the steel

and second as the sound travels through the air. This suggests which graph is true?

What is the sound intensity level if the intensity of the sound is doubled?

Building a new highway destroys habitats and can lead to soil erosion

Why do scientist make models?

Land acquired through the process of accretion or actually lost through erosion is an example of

The best kind of bridge ... using popsicle sticks? What bridge holds the most weight ... how do youmake a popsicle stick that won't break?

A rectangular loop of wire with sides 0.262 and 0.401 m lies in a plane perpendicular to a constant magnetic field (see part a of the drawing). The magnetic field has a magnitude of 0.

In the system you're inspecting the damper motor isn't working, You decide to see if the damper-postion sensor us sending the proper signal to the which then signals the damper motor. A. heating coil B. duckwork c. energy source D. controller

Which of the following statements does not describe the structure of an atom? a. An atom has a small, dense center called the nucleus. b. Inside the nucleus of an atom are protons and electrons. c. Protons are positively charged sub-atomic particles.

A. Which skill related fitness component is your strongest and weakest?

A 100 N box is placed on an inclined plane that makes a 30° angle with the horizontal. Calculate the component of gravitational force that acts down the inclined plane. A. 25 N B. 50 N C. 87 N D. 100 N