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1. A particular object weighs 343 N In air and 144 N when immersed in alcohol of density 0.7 g/cm3. What are the volume and the density of the object?
2. In order to lift a wire ring of radius 2.25 cm from the surface of a container of blood plasma, a vertical force of 1.30 X 10-2 N greater than the weight of the ring Is required. Calculate the surface tension of blood plasma from this information.
3. 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.
The G string of a guitar which should be 392 Hz is playing flat at 380 Hz. What percentage change in the tension of the wire is required so as to tune the string to 392 Hz
You have a 2.03-m-long stretched string with a mass of 19.9 g. Calculate the tension in the string
When a current flows in an aluminum wire of diameter 2.13 mm, the drift speed of the conduction electrons is 1.83 × 10-4 m/s. What is the electron current in the wire
A snow skier, starting from rest, goes downhill for 5.00s and reaches a level spot of smooth snow. What is the skier's average acceleration down the hill
A typical ten-pound car wheel has a moment of inertia of about. What is the rotational kinetic energy of the rotating wheel
To help prevent frost damage, fruit growers sometimes protect their crop by spraying it with water when overnight temperatures are expected to go below freezing. How much heat is released by the water when it freezes
a 4kg watermelon is balanced on bruces shaved. r. lee ermey who hates watermelons with every fiber of his being shoots
the motor in a refrigerator has a power output of 200w. if the freezing compartment is at 270k and the outside air is
A 1460-kg submarine rises straight up towards the surface. Seawater exerts both an upward buoyant force of 16300 N on the submarine, as well as a downward resistive force of 1090 N. What is the submarine's acceleration?
Please help me solve this problem: The electric motor of a model train accelerates the train from rest to 0.600 m/s in 33.0 ms. Find the average power delivered to the train
A neodymium-glass laser emits short pulses of high-intensity electro magnetic waves. The electric field of such a wave has an rmsvalue of Erms=2.0E9 N/C. Find the average power of each pulse thatpasses through a 1.6E-5 m2 surface that is perpendic..
A skier starts from rest at the top of a hill. The skier coastsdown the hill and up a second hill, as the drawing illustrates. Thecrest of the second hill is circular, with a radius of r =33 m.
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