You blow across the open mouth of a test tube and produce the fundamental standing wave of the air column inside the test tube if the length of the air column in the test tube is 14 cm, what is the frequency of the fundamental standing wave in the air column if the test tube is half filled with water? the speed of the sound in air is 344 m/s.

a: 1000 hz
b: 980 hz
c: 460 hz
d: 1230 hz

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

An ideal polarizer with its transmission axis rotated 30 degrees to the vertical is placed in a beam of unpolarized light of intensity 10w/m^2. after passing through the polarizer, what is the intensity of the beam? a. 8.7 w/m^2 b. 7.5 w/m^2 c. 5.0 w/m^2 d. 10 w/m^2 e. 2.5 w/m^2

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)