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Q. What is the maximum tension they can produce in the Achilles tendon? (Muscles are attached to bones by means of tendons. The maximum force that a muscle can exert is directly proportional to its cross-sectional area at the widest point. We can express this relationship mathematically as , where (sigma) is a proportionality constant. Surprisingly, is about the same for the muscles of all animals and has the numerical value of in SI units.)
The gastrocnemius muscle, in the back of the leg, has two portions, known as the medial and lateral heads. Assume that they attach to the Achilles tendon. The cross-sectional area of each of these two muscles is typically for many adults.
Radioactive isotopes frequently occur together in mixtures. Assume a 400g sample contains, with a half-life of 12 days, and, with a half-life of 4.5 days. If there are firstly twice as many calcium atoms as there are barium atoms, what will be the ra..
An asteroid is discovered heading straight toward Earth at 14km/s. An international team manages to attach a giant rocket engine to the asteroid. The rocket fires for 10 {rm min}, after which asteroid is moving at 26^circ to its original path at a..
How much power must you exert to horizontally drag a 20.0 kg table 14.0 m across a brick floor in 40.0 s at constant velocity, assuming the coefficient of kinetic friction between table and floor is 0.550.
A 302g ball is tied to a string. It is pulled to an angle of 6.00 degrees and released to swing as a pendulum. A student with a stopwatch finds that 17 oscillations take 12.0s. How long does the string.
A female gymnast weighs 620 N. If she is hanging stationary from a high bar, how many forces are acting on her.
A hawk is flying horizontally at 17.0m/s in a straight line, 160 m above the ground. A mouse it has been carrying struggles free from its grasp. The hawk continues on its path at the same speed for 2.00s before attempting to retrieve its prey.
A weightlifter has been given a barbell to lift. One end has a mass of 5.05 kg while the other end has a mass of 5.20 kg. The bar is 0.20 m long. (Consider the bar to be massless, and assume that the masses are thin disks, so that their centers of ma..
A hotel elevator ascends 170 m with a maximum speed of 5.9 m/s. Its acceleration and deceleration both have the magnitude of 1.5 m/s2.
What is wind velocity
A gymnast of mass 69.0 kg hangs from a vertical rope attached to the ceiling. You can ignore the weight of the rope and assume that the rope does not stretch. Use the value 9.81 for the acceleration of gravity.
An airplane is flying with a velocity of 90 m/s at an angle of 25 above the horizontal. When the plane is a distance 126 straight above a dog that is standing on level ground, a suitcase drops out of the luggage compartment.
What is the net force exerted by these two charges on the third charge = 46.5 placed between and at = -1.235 ? Your answer may be positive or negative, depending on direction of the force.
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