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Two cylindrical rods one copper and the other iron are identical in lengths and cross-sectional areas. They are joined, end to end to form one long rod. A 12-V battery is linked across the free ends of the copper-iron rod. What is the voltage among the ends of the copper rod?
An optometrist prescribes contact lenses that have a focal length of 56.0 cm. Where is the unaided near point of the person located
A rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge 235 m below. With what speed do the supplies land in the latter case
In civil aviation, a "standard turn" for level flight of apropeller driven airplane is one in which the airplane makes acomplete circular turn in 2 min. If the plane's speed is 168 m/s, what is the radius of the circle?
An object is placed 24.5 cm to the left of a thin converging lens that has focal length +12.1 cm. What is the distance between the object and the image
Suppose an oxygen molecule traveling at a velocity of 480m/s bounces back and forth between opposite sides of a cubical vessel 0.19 on a side. What is the average force per unit area
The efficiency of a knife is 75%. If you push down on the knife with a force of 5 N to cut a piece of cake that is 6 cm thick, how much work is done on the cake
Object O1 is 14.7 cm to the left of a converging lens with a 12.0-cm focal length. A second lens is positioned 10.0 cm to the right of the first lens and is observed to form a virtual image at the position of the original object O1.
An ice skater has by herself a moment of inertia of 5.5 kg m^2 with her arms out, with her arms in it is 5.0 kg m^2. how fast will she be spinning if she brings her arms in a distance of .7 m
A person is standing 8 m away from a speaker and experiences an intensity level consistent with the standard pain threshold. what is the power of the speaker
a man stands on the roof of a building of height 15.9 and throws a rock with a velocity of magnitude 29.5 at an angle
Communications satellites are placed in a circular orbit where they stay over a fixed point on the equator. Find average speed of the satellite in geosynchronous orbit
Although the evidence is weak, there has been concern in recent years over possible health effects from the magnetic fields generated by transmission lines. Estimate the magnetic field strength on the ground
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