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You perform a knee extension exercise on a cable type machine during which your knee joint rotates through an angular displacement of 0.85 radians in 4.35 second. At the beginning and end of that time the weight is motionless. That action, together with the various ratios in the machine causes a weight of 422 Newton to be lifted a total of 0.35 meter. Find your average knee torque during the lift?
An electron that is moving through a uniform magnetic field has a velocity v = (30 km/s)i + 18 km/s)j when it experiences a force F = (-4.000×10-15 N)i + (6.667×10-15 N)j due to the magnetic field. If Bx = 0, calculate the magnitude of the magnetic f..
Two earthquake waves of the same frequency travel through the same portion of the Earth, What is the ratio of the amplitudes of the two waves
A copper vat is 12m long at room temperature (20°C). How much longer is it when it contains boiling water at 1 atm pressure?
q1. a 1.2 kg mass attached to a spring oscillates with amplitude of 6.3 cm and a frequency of 1.1 hz. what is its
A car with a total mass of 1.78 103 kg has wheels of radius 31.0 cm and moment of inertia 0.805 kg · m2. Find the car's rotational energy when the car is moving at a speed of 22.5 m/s
A ball is thrown horizontally from the top of a 75 m building and lands 130 m from the base of the building, What is the vertical component of the velocity just before the ball hits the ground in m/s
A charge ?1.3 × 10^ ?5 C is ?xed on the x-axis at 9 m, Calculate the electric potential at the origin
The reflecting surfaces of two mirrors form a vertex with an angle of 125 degrees.If a ray of light strikes mirror 1 with an angle of incidence of 58 degrees, find the angle of reflection of the ray when it leaves mirror 2.
Two 1.7 kg masses are 2.0 m apart (center to center) on a frictionless table. Each has +1.0 µC of charge. What is the magnitude of the electric force on one of the masses
A charged particle A exerts a force of 2.75 ?N to the right on charged particle B when the particles are 12.0 mm apart. Particle B moves straight away from A to make the distance between them 17.6 mm. What vector force does particle B then exert o..
On a frozen pond, a 10.7 kg sled is given a kick that imparts to it an initial speed of vo = 2.00 m/s. find the distance the sled moves before coming to rest
A star similar to our sun radiates energy at the prodigious rate of4.6 1026 W. At what rate does this star convert mass into energy
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