Two trains are approaching each other on parallel tracks. Train 777 is moving South at 77.7 MPH and train 666 is moving North at 66.6 MPH. The conductor on train 777 blows his horn and hears a frequency of 440 Hz. What frequency does the conductor on train 666 hear? Assume the speed of sound is 345 m/s. 

A spring with an unstretched length of 40.0 inches is hung from the ceiling. A 10.0 lb weight is then hung from the bottom of the spring and stretches it downward by 4.00 inches. The weight is then pulled a further 6.00 inches downward and released from rest. Calculate: a) the spring constant of the spring b) the frequency of the resulting oscillations c) the maximum velocity of the weight as it bounces up and down

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Use your mouse/pointer to select on the image below the: Sublingual salivary gland

Which type of tissue wears away in the joints, leading to bone-on-bone contact?

What is the force responsible for normal expiration?

Use your mouse/pointer on the image below to select the: Pyloric sphincter 

Which type of pathogen is unicellular and prokaryotic?

What is the function of the organ pointed out.