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Two identical coaxial coils of wire of radius35cm are directly on top of each other, separated by a1-mm gap. The lower coil is on a flat table and has a currentiin the clockwise direction; the upper coil carries an identical current and has a mass of0.054kg. Determine the magnitude and the direction that the current in the upper coil has to have to keep the coil levitated at its current height.
A 7.28-%u03A9 resistor is connected across a 9.00-V battery. The voltage between the terminals of the battery is observed to be only 7.27 V. obtain the internal resistance of the battery
The water in a tank is at a gauge pressure of 283,685 Pa. what is the force on the bottom of the tank
A 2590-kg spacecraft is in a circular orbit 2720 km above the surface of Mars. How much work must the spacecraft engines perform to move the spacecraft to a circular orbit that is 4480 km above the surface
.250 kg ball is dropped to the floor from a height of 1.0 m and upon rebounding, reaches a height of .60 m. What is the impulse delivered to the ball by the floor?
A spherical metallic Christmas tree ornament has a diameter of 6.41 cm. If Saint Nicholas is by the fireplace, 1.37 m away, where will he see his reflection in the ornament
Two boats start together and race across a 46 km wide lake and back. Boat A goes across at 44 km/h and returns at 48 km/h. Boat B goes across at 27 km/h, and its crew, realizing how far behind it is getting, returns at 69 km/h. Turnaround times are n..
The sun moves in an orbit about the center of the Milky Way Galaxy at a speed of 290 km/s with a radius of 3 x 1020 km. How many stars are in the galaxy
A cubical piece of heat-shield tile from the space shuttle measures 0.12 m on a side and has a thermal conductivity of 0.072 J/(s m · C°). How much heat flows from the outer to the inner surface of the tile in six minutes
A guitar string is 90 cm long and has a mass of 3.8g. What are the frequencies of the fundamental and first two overtones
An audio amplifier, represented by the AC source and the resistor R, delivers alternating voltages at audio frequencies to the speaker. what is the average power input into the speaker
An object with a height of 2.49cm is placed 35.5mm to the left of a lens with a focal length of 34.2mm. What is the height of the image
The femur is a bone in the leg whose minimum cross-sectional area is about 4.1 x 10-4 m2. Find the maximum stress that this bone can withstand
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