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A block of mass 7.1 kg is pulled along a horizontal frictionless floor by a cord that exerts a force of 41.0 N at an angle 34.9° above the horizontal. What is the magnitude of the acceleration of the block? 4.74 m/s^2 What is the magnitude of the normal force exerted on the mass by the floor?
A person uses corrective glasses of power -8.5 D. If the glasses are worn 2.0 cm from the eye, what is the person's far point without glasses
A box weighing 250-N is supported by the cable; the tension in the cable is 120-N. How much time elapses as box falls (starting from rest) 15.0 m.
A solid, rectangular iron bar measures .40cm by 1.0cm by 30cm. Find the resistance between each of the three pairs of opposing faces, assume the faces in question are quipotentials.
A supertanker (mass 1.70 x 10^8 kg) is moving with a constant velocity. Its engines generate a forward thrust of 7.40 X 10^5 N. Determine a) the magnitude of the resistive force exerted on the tanker by water and b) the magnitude of the upward buoyan..
q1. a person whose eyes are h 1.64 m above the floor stands l 2.3 m in front of a vertical plane mirror whose bottom
A football is kicked at ground level with a speed of 15.0 m/s at an angle of 34.0° to the horizontal. How much later does it hit the ground
A 24 GeV proton in cosmic radiation moves in Earth's magnetic field B, with a velocity v perpendicular to B, What is the radius of the proton's curved path in that region
The magnetic field of a plane-polarized electromagnetic wave is given by B=1.2*10^-6 Sin[2pi (z/240 – (t*10^7)/8)] in SI units . The field vector is B_ = B(z,t)[(i^+J^)/ 2^(1/2)]. Find the average power per square meter carried by the EM wave. Writ..
The electric field between two equal but opposite point charges, at a point four-ninth the distance from the negative charge to the positive charge, is 4.39*10
A thin layer of oil (n=1.25) is floating on water (n=1.33). What is the minimum non zero thickness of the oil in the region
An ammeter with an internal resistance of 51.0 ? measures a current of 5.05 mA in a circuit containing a battery and a total resistance of 1390 ?. Determine the actual value of the current
A person ca throw a 1.00 Kg stone at a speed of 15.0 m/s. He moves his hand forward 0.75 m while doing so. How much work does the person do on the rock
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