Physics - Bats and dolphins use echolocation to navigate or the find food

Bats and dolphins use echolocation to navigate or the find food or to find their way without relying on sight. The frequencies they use are 
A) supersonic 
B) infrasonic 
C) ultrasonic 
D) microsonic

Answer:
C) ultrasonic 

Both bats and dolphins use ultrasound with frequencies of about 50 kHz and above.

Physics - Light and sound are both waves. You can see a ringing bell

Light and sound are both waves. You can see a ringing bell inside an evacuated glass container but you can not hear it. This is because
A) of resonance
B) light travels faster than sound
C) sound requires air to be transmitted and light does not
D) light passes through glass but sound does not

Answer:
C) sound requires air to be transmitted and light does not

Physics - How will the frequency of the sound used for echolocation affect

How will the frequency of the sound used for echolocation affect the size of objects that can be detected? Will higher or lower frequencies allow for detection of smaller objects with echolocation?

Answer:
The wavelength of a wave determines how it will be reflected. The shorter wavelengths of higher frequencies mean that the echolocation of bats and dolphins help them identify more detail -- or smaller objects -- than would be possible with longer wavelengths or lower frequencies.

Physics - Consider a tug-of-war on a smooth floor between boys wearing socks

Consider a tug-of-war on a smooth floor between boys wearing socks and girls wearing rubber soled shoes. Why do the girls win? 

Answer:
The girls can exert a greater force with their rubber soled shoes so they will win.

Physics - If a Mack truck and Honda Civic have a head-on collision,

If a Mack truck and Honda Civic have a head-on collision, upon which vehicle is the impact force greater? Which vehicle experiences the greater acceleration?

Answer:
The force will be the same on the two vehicles, according to Newton's Third Law. That means the Civic, with far less mass, will experience a much greater acceleration, according to Newton's Second Law.

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