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Water is transported upward in a plant through xylem tissue, which consists of cells of 1 mm length and a diameter of 65 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.
In a church choir loft, two parallel walls are 5.70 m apart. The singers stand against the north wall. What width of the north wall can she see
A 10-m long plank with a mass of 15-kg is supported at each. A 70 kg person stands on the plank between the supports. how far is the person standing from the left support
A 12 volt battery powers a circuit that consists of a ten ohm resistor in series with a ten ohm and a 15 ohm that are in parallel. How much current flows through the 15 ohm resistor
one 73" c8x11.5 steel beem is connected to a 22" c8x11.5 fish plate made up of 6x15x1/4 steel plate on each side bolted togething using 3/4" structural bolts, What is the Max capacity of this beam
Flux and nonconducting shells. A charged particle is suspended at the center of two concentric spherical shells that are very thin , What is the charge of the central particle
A sample is being dated by the radiocarbon technique. If the sample were uncontaminated, its activity would be 0.064 Bq per gram of carbon. Calculate the true age (in years) of the sample
A contact lens is made of plastic with an index of refraction of 1.50. The lens has an outer radius of curvature of +2.0cm and an inner radius of curvature of +2.5cm. What are the focal length and the power of the lens?
A 3-kg ball traveling to the right with a speed of 4 m/s collides with a 4-kg ball traveling to the left with a speed of 3 m/s. What is the total momentum of the two balls before and after the collision
A weather emergency siren is mounted on a tower, 165 meters above the ground. How far away from the base of the tower can a person be
Calculate the force of gravity on a spacecraft 25600 km (4 earth radii) above the Earth's surface if its mass is 1500 kg
compute the total energy radiated by the Sun each second.
A forearm accelerates a 3.6-kg ball at 7.0m/s^2 by means of the triceps muscle.If the lever arm is 31cm, find the force that must be exerted by the triceps muscle
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