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A muscle-tendon unit is composed of a tendon with a stiffness of 6640N/m, a muscle with a stiffness of 9070N/m, and an insertion tendon with a stiffness of 10765N/m. The muscle is 89% fast twitch and has an optimal length 0.12m. What is the stiffness of the muscle-tendon unit?
what is its kinetic energy at the end of the interval. How high a tree would a 80 kg person have to climb to increase his gravitational potential energy relative to the ground by that amount.
Assuming that air resistance is simply a constant 91 N force on the person during the fall, identify the person’s velocity just be- fore hitting the net.
A 60kg boy and a 45 kg girl use an elastic rope while engaged in a tug-of-war on a frictionless icy surface. If the acceleration of the girl toward the boy is 2.3 m/s2, find the magnitude of the acceleration of the boy toward the girl.
A diverging lens (f = -12 cm) is located 20.0 cm to the left of a converging lens (f = 34.5 cm). A 3.00 cm tall object stands to the left of the diverging lens, exactly at its focal point.
An electron initially at rest recoils after a head-on collision with a 5.94-keV photon. Determine the kinetic energy acquired by the electron
A parallel-plate air capacitor with a capacitance of 245 has the charge of magnitude 0.1502 on each plate. The plates have the separation of 0.323.
A proton (with a rest mass m=1.67×10?27kg) has a total energy that is 4.00 times its rest energy. What is the magnitude of the momentum p of the proton
Suppose the space shuttle is in orbit 460km from the Earth's surface, and circles the Earth about once every 93.80 minutes. Find the centripetal acceleration of the space shuttle in its orbit. Express your answer in terms of g, gravitational accelera..
A cannon tilted up at a 26 degree angle fires a cannon ball at 71m/s from atop a 12m -high fortress wall
A helicopter is ascending vertically with a speed of 4.50 m/s. At a height of 195 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground.
A 720-kg race car can drive around an unbanked turn at a maximum speed of 43 m/s without slipping. The turn has a radius of 160 m, What is the coefficient of static friction between the track and the car's tires
A 60 kg skier starts from rest at a height of H = 21 m above the end of the ski-jump ramp. As the skier leaves the ramp, his velocity makes an angle of 28° with the horizontal. avoid the effects of air resistance and assume the ramp is frictionles..
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