Why do animals use echolocation? Check all that apply.

to find each other

to find food

to find warmer areas

to find sunlight

to find their way

A beam of light is traveling through a medium at 200,000 km/s. It enters a different medium and speeds up to almost 250,000 km/s. Finally, it enters a third medium and halts. What were the media the light traveled through, in order? Hurry!

After falling for 3 seconds, an object will be falling downwards at what rate?

If the atoms of one object (initially neutral) have electrons rubbed off through friction with a second object, the first object becomes---?

Is the amount of energy in a sound wave per unit of time and is also related to the loudness of a sound.

You work in a materials testing lab and your boss tells you to increase the temperature of a sample by 34.9 âc. the only thermometer you can find at your workbench reads in degrees fahrenheit. if the initial temperature of the sample is 70.

A perpetual motion machine can never be built because it is not possible to eliminate A) Momentum B) Inertia C) Elasticity D) Friction

What makes the lumbar vertebrae different from the cervical vertebrae and the thoracic vertebrae?

Matter has Certain types of what

Identify the type of relationship that exists between density and temperature

You are standing on the sidewalk and see a bus drive by. What would be an ideal frame of reference? A bird flying overhead A jogger running along the sidewalk A car driving alongside the bus A tree across the street