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A 60 kg gymnast holds an iron cross position on the rings. In this position, the gymnast's arms are abducted 90 degrees and his trunk and legs are vertical. The horizontal distance from each ring to the gymnast's closest shoulder is 0.60 m. The gymnast is in static equilibrium.
a. What vertical reaction force does each ring exert on each hand?
b. What torque is exerted by the right ring about the right shoulder joint?
c. How much torque must the right shoulder adductor muscles produce to maintain the iron cross position?
d. If the moment arm of the right shoulder adductor muscles about the shoulder joint is 5 cm, how much force must these muscles produce to maintain the iron cross?
Two converging lenses, each of focal length 14.2 cm, are placed 59.9 cm apart, and an object is placed 26.6 cm in front of the first. determine the magnification of the system
Consider a Universe where matter density is 0, and it has a significant cosmological constant. How old is the Universe in this case
In an RLC circuit, the following three elements are connected in series: a resistor of 31.0 ohm, a 22.2-mH inductor, and a 0.390-µF capacitor. Find the power factor for the RLC series circuit
A rattlesnake can strike with the acceleration equivalent to an increase in speed from 0 to 60 mi/h in 1/2 s. If the rattlesnake's head weighs 0.33 lb, what average power does the rattlesnake generate throughout its strike.
Bill measures the rate at which the clock in sam's spaceship runs and finds that it is 1/3 the rate at which the same clock runs when it is at rest
When resting, a person has a metabolic rate of about 5.84 x 105 joules per hour. The person is submerged neck-deep into a tub containing 3.61 x 103 kg of water at 28.8 °C. If the heat from the person goes only into the water, find the water temper..
Regarding the Earth and a cloud layer 750m above the Earth as the "plates" of a capacitor, calculate the capacitance. Suppose cloud layer has an area of 1 km2 and that the air between cloud and ground is pure and dry.
A Ferris wheel is moving at an initial angular velocity of 1.0 rev/37 s. If the operator then brings it to a stop in 3.2 min, what is the angular acceleration of the Ferris wheel
A light wave has a 660nm wavelength in air. Its wavelength in a transparent solid is 440nm. What is the speed of light in this solid
A car starts from rest and travels for 5.0 s with a uniform acceleration of +1.8 m/s2. How fast is the car going at the end of the braking period
A 1.0-cm-diameter pipe widens to 2.0 cm, then narrows to 0.5 cm. Liquid flows through the first segment at a speed of 4.0m/s. What is the speed in the second segment
Assume that 10 g of steam is added to 100 g of water initially at 19°C. The water is inside an aluminum cup of mass 35 g. Find the final temperature of the water after equilibrium is reached
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