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When the temperature of a thin silver [? = 19 × 10-6 (C°)-1] rod is increased, the length of the rod increases by 3.7 × 10-3 cm. Another rod is identical in all respects, except that it is made from gold [? = 14 × 10-6 (C°)-1]. By how much does the length of the gold rod increase when its temperature increases by the same amount as that for the silver rod?
A 45kg figure skater is spinning on the toes of her skates at 1.2rev/s . Her arms are outstretched as far as they will go. What is her new rotation frequency, in revolutions per second
A Geiger counter consists of a tube of radius r and legnth L centered around a positively charged filament of equal length. What answer do you get for the linear charge density of the filament if you approximate its length to be infinite
A 5.6cm diameter horizontal pipe gradually narrows to 4.6cm . When water flows through this pipe at a certain rate, What is the volume rate of flow
a world class sprinter can burst out of the blocks to essentially top speed of about 11.5m/s in the first 15.0m of the race. What is the average acceleration of the sprinter
A length of wire has a total resistance of 120 ?. If cut up into N identical pieces, How many pieces did the original wire get cut up into
A coin with a diameter of 3.00 cm rolls up a 30.0 degree inclined plane. The coin starts with the initial angular speed of 60.0 rad/s and rolls in a straight line without slipping. How far does it roll up the inclined plane.
Consider two identical +53 microcoulomb point charges placed 58 cm apart. Calculate the work (in J) required to move the test charge to a point 8 cm closer to either of the charges
A 540 g ball swings in a vertical circle at the end of a 1.2 m-long string. When the ball is at the bottom of the circle, What is the speed of the ball at that point
Estimate the thickness of the Earth's atmosphere. From your chemistry class, you know that the most common speed of a nitrogen molecule is 640 m/s. What is the altitude
NASA sends a satellite to another planet by placing the satellite in a Keplerian orbit (around the sun) such that the perihelion is at the radius of the Earth's orbit (1 AU) and the aphelion is at the radius of the planet's orbit. Most of the trip is..
The primary coil of a transformer has 237 turns; secondary coil has 2100 turns. An alternating current is sent through the primary coil. The emf in the primary is 25 V. What is the emf amplitude in secondary.
An unstrained horizontal spring has a length of 0.34 m and a spring constant of 200 N/m. Two small charged objects are attached to this spring, one at each end, determine the possible algebraic signs
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