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Place on magnet on a table and hold the other in your hand, well above the first. From directly above, slowly lower the upper magnet toward the first. Watch for the moment when the lower magnet jumps up to meet the upper. Separate the magnets and try again. From the sudden jump of the lower magnet, what can you conclude about the way the magnetic force between the magnets varies with distance?
A man pushes a lawn mower on a level lawn with a force of 189 N. If 38% of this force is directed downward, how much time is spent in pushing the mower this distance
The potential difference between two points in a wire 10 m apart is 12 V. When the current density is 4*10^7 A/m^2. find the resistivity of the material in the wire
a long horizontal wire carries a current of 48 amps. A second wire, made of 2.5 mm diameter copper wire and parallel to the first, is kept in suspension magnetically 15 cm below. Determine the magnitude and direction of the current in the lower wi..
A dipole is formed by point charges +3.8 micro Coulomb and -3.8 micro Coulomb placed on the axis at (0.45 m, 0) and (-0.45m, 0), respectively. At what positions on the axis does the potential have the value 7.7×105 V? There should be an x1 and an ..
A uniform meter stick is in static rotational equilibrium when a mass of 220g is suspended from the 5.0-cm mark, What is the mass of the meter stick
a planet has two small satellites in circular orbits around the planet. the first satellite has a period 12 hours and an orbital radius 6*10^7m. what is the orbital radius of the second satellite
Find the magnetic vector potential inside and outside a slab of thinkness 2a, extending infinitely in x and y directions. Use Coulomb's gauge. J= -J e^-abs(z)/a)
A steel wire in a piano has a length of 0.60- m and a mass of 4.5 x10-3 kg. To what tension must this wire be stretched in order that the fundamental vibration correspond to middle C (fC = 261.6 Hz on the chromatic musical scale).
Estimate how many books can be shelved in a college library with 3400 of floor space. Assume 5 shelves high, having books on both sides
A loop of diameter d = 10 cm, carrying a current I = 0.2 A is placed inside a magnetic field = 0.3 T. Calculate the magnitude of the torque on the loop
In a game of football outdoors on a cold day, a player will begin to feel exhausted after using approximately 7.8x105 J of internal energy. What is the magnitude of the heat that he has lost
The work on a system with a mass 100 lbm is known to be 10 BTU's . If there is no change in potential energy and the speed changes from rest to 32 ft/sec. What is the change in the internal energy of the system?
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