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Name two basic differences between normal and active galaxies. How do astronomers account for the differences in the spectra observed from active galaxies?
Three long, straight, parallel wires all lie in the yz plane and each carries a current of 20 A in the positive z direction. The two outer wires are each 4.0 cm from the center wire. What is the magnitude of the magnetic force on a 50-cm length of ei..
A small object is located 16.0 cm in front of a concave mirror with a radius of curvature of 46.0 cm. Where will the image be formed? (Enter a negative value if the image forms behind the mirror.)
An 18-year-old runner can complete a 10.0 km course with an average speed of 4.38 m/s. A 50-year-old runner can cover the same distance with an average speed of 3.88 m/s. How much later (in seconds) should the younger runner start in order to fini..
Each of the three helicopter rotor blades shown in Fig. 10-67 is5.20 m long and has a mass of 297 kg. The rotor is rotating at 215rev/min. (a) What is the rotational inertia of the rotor assembly about the axis of rotation? (Each blade can beconsider..
two children 50.0 kg each sit on opposite ends of a narrow board with length of 4.60 m and mass of 40.0 kg which can be
The Bullet Train The Shinkansen, the Japanese"bullet" train, runs at high speed from Tokyo to Nagoya. Riding onthe Shinkansen, you notice that the frequency of a crossing signalchanges markedly as you pass the crossing.
Compute the force of gravity between a newborn baby (mass = 4 kg) and the planet Mars (mass = 6.4 x10^23 kg), when Mars is at its position closest to Earth (distance = 8.0 x10^10 m).
An ideal monatomic gas is the working substance of a Carnot engine. During the isothermal expansion the volume doubles. Compute the temperature of the reservoirs between which the engine operates
A nylon guitar string has a linear density of 5.56 g/m and is under a tension of 161 N. The fixed supports are D = 74.4 cm apart. The string is oscillating in the standing wave pattern shown in the figure. Calculate the (a) speed, (b) wavelength, and..
A military helicopter on a training mission is flying horizontally at a speed of 60.0 m/s, How far does it travel horizontally while falling
It will be shown later that the scale height, H, is proportional totemperature, T. For an average temperature of 255 K, the scaleheight is 7.5 km assuming an isothermal atmosphere
A ranger in a national park is driving at 52 km/h when a deer jumps onto the road 86 m ahead of the vehicle. After a reaction time of t s, the ranger applies the brakes to produce an acceleration of -2.9 m/s2.
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