# Project #97495 - physics

1)A diver accustomed to standard snorkel tubing of length 25 cm tries a self-made tube of length 3 m. During the attempt, what is the pressure difference between the external pressure on the diver's chest and the air pressure in the diver's lungs? (Assume the diver is in a fresh water lake with density ρ = 1.0 g/cm3.)
kPa

What happens to the diver as a result of the attempt?

2)Consider the following. Note: Draw the free body diagram in each case.
(a) Figure (b) shows a wooden sphere with a diameter of d = 13 cm  (density ρ = 0.7 g/cm3)
held under water by a string. What is the tension in the string? (Assume the density of the water is 1000 kg/m3. Enter the magnitude only.) N

(b) Figure (a) shows a sphere of radius
r = 16 cm
and density of
ρ = 3.5 g/cm3
suspended in water. What is the tension in the string? (Assume the density of the water is 1000 kg/m3. Enter the magnitude only.)
N

3) A particular object weighs 403 N in air and 154 N when immersed in alcohol of density 0.7 g/cm3. What are the volume and the density of the object?
(a) the volume
L

(b) the density
kg/m3

4) Water is transported upward in a plant through xylem tissue, which consists of cells of 1 mm length and a diameter of 185 µm. The xylem cells are attached to each other to form a channel. To what maximum height can water rise in these xylem channels due to capillarity? For those interested: Confirm this result with a simple experiment: Cut and split the stem of a flower with white petals (e.g., a dahlia or a carnation) and place one half the stem in a glass with dilute red ink and the other half in a glass with dilute blue ink. After several hours the flower will be half red and half blue.
m

 Subject Science Due By (Pacific Time) 12/05/2015 02:00 pm
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