External respiration takes place in the ... ?

A) Bronchi

B) Trachea

C) Alveoli

D) Diaphragm

What changes when the force of gravity changes?

Bernini's sculpture apollo and daphne implies motion. what kind of motion is being depicted?

When talking about variables in a scientific experiment, describe how you know what the independent variable, dependent variable, control and constant are in the experiment. How do you know which one is which?

An insulated beaker with negligible mass contains 0.250 kg of water at 75.0C. How many kilograms of ice at - 20.0C must be dropped into the water to make the final temperature of the system 40.0C?

An earth satellite in an elliptical orbit travels fastest when it is

A 5.00*105-kg subway train is brought to a stop from a speed of 0.500 m/s in 0.400 m by a large spring bumper at the end of its track. what is the force constant k of the spring

A moving object always has energy in its?

What is the volume of a box that is 12 cm long, 2 cm wide, and 3 cm high?

Suppose a child drives a bumper car head on into the side rail, which exerts a force of 4000 N on the car for 0.200 s. (a) What impulse is imparted by this force?

If a soundproof door is almost shut but still leaves a small opening, what wave phenomenon is responsible for someone being able to hear sound from the room while standing by the wall to the side of the opening?