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a 30 kg girl and a 50 kg boy face each other on friction-free roller skates. the girl pushes the boy, who moves away at a speed of 3 m/s. what is girls speed.
a wire carrying a current is placed in a uniform magnetic field. When a current of 3.7A flows in the wire there is a force of 0,075N on each 18cm of wire in the field
A 0.07-kg lead bullet traveling 296 m/s strikes an armor plate and comes to a stop. If all of the bullet's energy is converted to heat that it alone absorbs
A tuning fork with a frequency of 440 Hz is held above a resonance tube that is partially filled with water. Where will the nodes and antinodes occur
A ring of charge is centered at the origin in the vertical direction, Find the total electric field, E, of the ring at the point P = (2.25 m, 0.00 m)
A 25 turn circular coil of length 5.5 cm produces a magnetic field of magnitude 2.5 mT at its center. Find the current in the lamp
A person pushes a 10 kg box from rest and accelerates it to a speed of 3.2 m/s with a constant force. what is the force exerted by the person
alex and bob are twins working on a space station located at a fixed position in deep space. alex undertakes an
a toroid having a square cross section 7.32 cm on a side and an inner radius of 16.2 cm has 560 turns and carries a
What is the acceleration of a 747 jumbo jet, mass 31,000 kg, in takeoff when the thrust for each of its four engines is 28,000 N?
A window washer pulls herself upward using the bucket-pulley apparatus shown in Fig. 4-42. The mass of the person plus the bucket is 60 kg. (a) How hard must she pull downward to raise herself slowly at constant speed? If she increases this force by ..
The mass of the sled and its two riders in the figure below is 300 kg. find the magnitude of the centripetal force that acts on the sled
A railroad locomotive with a mass of can exert a force of. At what rate can it accelerate when pulling a train
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