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A 75 kg adult male is being tested for knee extension strength. The length of his calf segment is .38m. The combined calf/foot segment is 57% of the calf length from the knee joint. The radius of gyration of the calf/foot segment about its mass center is 45% of the calf length. The moment arm of the knee extensor muscle is .04m. The knee extension exercise equiptment padding is .35m from the knee joint.A) what is the moment of interia of the calf/foot segment about the foot mass center?b) what is the moment arm of the calf/foot segment about the knee joint?c) the knee joint angle is being held at a constant 60 degress below the horizontal (flexion). If the maximum force that can be applied to the equiptment padding is 300 N, how much quadriceps muscle force is being generated?
A cube of ice is taken from the freezer at -7.2 ?C and placed in a 115g aluminum calorimeter filled with 318g of water at room temperature of 20.0 ? C. What was the mass of the ice cube
A 0.58 kg toy airplane is suspended from the ceiling by a 1.6 m long cord and rotates in a horizontal circle. If the cord makes an angle of 35 degrees with the vertical.
Consider the system with m1 = 24kg, m2 = 14.60kg, R = 0.1400m, and the mass of the pulley M = 5.0kg. Object m2 is resting on the floor, and object m1 is 4.600m above the floor when it is released from rest. The pulley axis is frictionless. The cor..
At a given point above the surface of Earth, the gravitational acceleration is equal to 7.8 m/s2. At what speed could a satellite be in orbit at this point
A pendulum clock is accurate on earth, where the period of its pendulum is 1.00 s. During a 2 h interval, what would be the elapsed time shown on the clock
A neutral pie-meson is particle that can be created by accelerator beams. If one such particle lives 1.40 x 10^16 s as measured in the laboratory, what is its velocity relative to the laboratory
Four point charges, q, are fixed to the four corners of a square that is 11.2 cm on a side. An electron is suspended above a point at which its weight is balanced by the electrostatic force due to the four point charges, at a distance of 11 nm abo..
A light bulb at point x in the frame of reference O blinks on and off at intervals, ?t = t2 - t1. Use the expressions for the Lorentz transformations to derive the expression for the time dilation relations ?t and ?t'
A current of 2.0 A is flowing along the z-axis in the positive z direction from the origin to z=-2 m. Find the magnetic field, Which field is the strongest and Why
A hockey puck moving at 33m/s slams through a wall of snow 38cm thick. It emerges moving at 19m/s. find the thickness of a snow wall
As you bounce a tennis ball of mass 5.10 10-2 kg off a wall, its velocity changes from vx = 10.8 m/s to vx = -7.9 m/s. Find the impulse applied to the ball
A herd of wild horses races across the flat, open plains of the Great Basin in central Nevada. If the horses are running at 12.1 m/s at a compass heading of 286 degrees, illustrate what is the northward component of their velocity?
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