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Leigh is doing a knee extension exercise using a 100 N weight strapped to her ankle 40 cm from her knee joint. She holds her leg so that the horizontal distance from her knee joint to the weight is 30 cm.
a. For this position, what torque is created by the dumbbell about her knee joint axis?
b. If the moment arm of the knee extensor muscles is 4 cm about the knee joint axis, what amount of force must these muscles produce to hold the leg in the position described? Ignore the weight of the leg.
A space probe is launched from Earth, headed for deep space. At a distance of 15,000 miles from the Earth's center, What is the size of the force when it is at 30,000 miles from the Earth's center
A solid sphere of uniform density starts from rest and rolls without slipping a distance of d = 4 m down a q = 25° incline. The sphere has a mass M = 4 kg and a radius R = 0.28 m. Illustrate what is the translationg kinetic energy
An ac generator with a frequency of 1.24 kHz and an rms voltage of 24.2V is connected in series with a 2.20 kOmega resistor and a 330 mH inductor. What is the average power consumed by this circuit
Two sinusoidal waves of the same period, with amplitudes of 4.0 and 6.0 mm, travel in the same direction along a stretched string; they produce a resultant wave with an amplitude of 9.225 mm. The phase constant of the 4.0 mm wave is 0. What is the..
A gardener feels it is taking him excessively long to water a garden with a 0.952cm diameter hose. By what factor will his time be shortened, if he uses a 1.58 cm diameter hose.
The drill pipe has an outer diameter of 75 mm, a wall thickness of 6 mm, and a weight of 0.8 kN/m. If it is subjected to a torque and axial load as shown.
A single strand of wire of adjustable length is wound around the circumference of a round balloon that has a diameter of 25.0 cm, what is the magnitude of the average value of the emf induced in the loop
A parallel plate capacitor has a separation between its plates of 1.0 mm. There is a dielectric with a dielectric constant of 2.1 fi ling the gap. what is the area of one of the capacitor plates
A jogger jogs around a circular track with the diameter of 325 m in 16 minutes. What was the jogger's average speed in m/s.
two strings with linear densities of g/m are stretched over pulleys, and attached to hanging blocks (string 1 is 20 kg=mass of block)-50 cm away. what is the unkown mass
A box of 350N weight is at rest at the bottom of the plank that is 6.0m long and rises 30 degree above the ground. what is the velocity of the box at the top of the plank
A bungee cord is stretched between two poles with a force of 407 N. What is the velocity of a wave on this bungee cord
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