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A person's forearm consists of a bone (which we can model by a rigid rod) that is free to rotate around the elbow. When the forearm is held level with the elbow bent at a 90 degree angle, the bone is supported by the bicep muscles, which are attached by a tendon to the bone a few centimeters away from the axis represented by the elbow. By making measurements on your own forearm and appropriate approximations and estimations (be sure you describe them) estimate the tension force on the biceps tendon when you hold an object with a mass of 10 kg in your hand (w/ your forearm level and elbow bent at 90 degrees).
You come across an open container which is filled with two liquids. Since the two liquids have different density there is a distinct separation between them. what is the density of the unknown fluid
A flywheel comprises a uniform circular disk with a mass of 105.0 kg and a radius of 1.0 m. It rotates with an angular velocity of 1227 rev/min. What is the initial kinetic energy of the wheel
A 53.26 g sample of a substance is initially at 29.9 °C. After absorbing 2429 J of heat, what is the specific heat of the substance
What is the work completed by the block and tackle system?
an electric field of 12.4 nc directed due north is superposed on an existing electric field of 16.5 nc directed due
In the drawing, the weight of the block on the table is 418 N and that of the hanging block is 205 N. What is the acceleration of the two blocks
The "size" of the nucleus in Rutherford's model of the atom is about 1.00 fm = 1.00E-15 m. Determine (in MeV) the electrostatic potential energy of the pair of protons
An astronaut is being tested in a centrifuge. The centrifuge has a radius of 9.6 m and, in starting, rotates according to ? = 0.34t^2, find the magnitudes of the astronaut's angular velocity
A child applies an 20.5 N force tangentially to the edge of the merry-go-round for 25.0s. If the merry-go-round is initially at rest, What is the average power supplied by the child
A spider hangs from a strand of silk whose radius is 4.0*10^-6m. Thedensity of the silk is 1300kg/m^3. determined the mass of the spider
A tennis player hits a ball 2.0 m above the ground. The ball leaves his racquet with a speed of 23.0 m/s at an angle 5.5 degrees above the horizontal. By how much does the ball clear the net
Find the critical angle for an optical fiber whose core has n value of 1.50 and whose cladding has n value of 1.15
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