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The group of knee flexors muscles insert on the tibia at an angle of 17° and insert 0.06 m from the axis of rotation at the knee. How much force must the knee flexors exert to produce an angular acceleration at the knee of 5 rad/s2 , given that the lower leg and foot together have a mass of 6.3 kg and radius of gyration of 0.21 m?
How old are the rocks brought back from the Moon? What is the Moon's orbital period? What is its rotation period? Why does the Moon rise 50 minutes later each day? What is the difference between a waxing phase and a waning phase of the Moon?
A horizontal bar of negligible weight has a 55.10 lb weight hanging from the left end and a 72.0 lb weight hanging from the right end. The bar is seen to balance 97.50 in from the left end. Find the length of bar.
A 200 gram object moves horizontally and slams into a 500 gramobject connected to a 1 meter long massless string. find the period of oscillation of the conglomerate object
A roller-coaster car may be represented by a block of mass 50.0kg. Find an expression for the kinetic energy K of the car at the top of the loop
Where is the near point of an eye for which a contact lens with a power of +2.80 diopters is prescribed? cm (in front of the eye)
The ground-state energy of a harmonic oscillator is 5.60eV. If the oscillator undergoes a transition from its n = 3 to n = 2 level by emitting a photon, what is the wavelength of the photon?
An 75.0 spacewalking astronaut pushes off a 640 satellite, exerting a 80.0 force for the 0.440 it takes him to straighten his arms. How far apart are the astronaut and the satellite after 1.5 min.
A charge of -2.300 µC is located at (3.055 m, 4.501 m), and acharge of 1.800 µC is located at (-2.102 m, 0). Find the electric potential at the origin
An astronaut with a total mass of 68.5 kg lands on a distant planet. The astronaut weighs himself on the surface of the planet and finds that his weight is 425.0 N. What is the magnitude of the gravitational acceleration on this planet?
A 75 kg block is being pulled up a 25 degree slope by a force of 200N which is parallel to the slope. What is the acceleration of the block
In a nuclear reactor, the effective cross section for thermal neutrons in uranium is the weighted average of the cross sections for the 235 and 238 isotopes present. The thermal neutron cross section is zero for 238U and 580 barns for 235U. Find..
steel rod (ρ = 7860 kg/m3) has a length of2.55 m. It is bolted at both ends between immobile supports. Find the tension that develops when the rodloses 3490 J of heat
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