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A metal wire has a resistance of 8.00 at a temperature of 20°C. If the same wire has a resistance of 10.85 at 90°C, what is the resistance of the wire when its temperature is -20°C?
A particular fish tank filled with fresh water (n = 1.33) has a coral reef sticker stuck to an exterior wall, What is the index of refraction of the tank's walls
A standard 1 kilogram weight is a cylinder 46.5 mm in height and 42.5 mm in diameter. What is the density of the material
A glass block (n = 1.56) is immersed in a liquid. A ray of light within the glass hits a glass-liquid surface at a 69.0° angle of incidence. What is the smallest possible refractive index for the liquid
A wire of length L = 15 is bent into a semi circle . If the total charge on the wire is -45nC, determine the electric field at the center point of the semicirlce.
A proposed ocean thermal-energy conversion (OTEC) system is a heat engine that would operate between warm water (26°C) at the ocean's surface, What is the maximum possible efficiency of the system
How various revolutions per minute would a 21 -diameter Ferris wheel need to make for the passengers to feel "weightless" at the topmost point.
An idealized voltmeter is connected across the terminals of a 16.5-V battery, and a 79.5-?appliance is also connected across its terminals. How much power is being dissipated by the appliance
A rotating wheel requires2.90s to rotate through 37.0 revolutions. What is the constant angular acceleration of the wheel
find out the z-component of the block's momentum after the kick.
A railroad hopper car has a mass of 50000 kg when empty and contains 50000 kg of coal. How fast does the car travel after all the coal is dumped
A rocket is fired straight upp from the ground with a 2.25 m/s acceleration. what is the speed of the rocked when the engines stop
The number of turns in the primary and the secondary of a step-up transformer are 93 and 439 respectively. what is the output voltage of this transformer
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