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The heating element in an electric drier operates on 240 V and generates heat at the rate of 2.0 kW. The heating element shorts out and, in repairing it, the owner shortens the Nichrome wire by 10%. (Suppose the temperature is unchanged. In reality, the resistivity of the wire will depend on its temperature.) What effect will the repair have on the power dissipated in the heating element?
Two springs with spring constants k1 and k2are put together end-to-end. Let x1 be the amount by which the first spring is stretched relative to its equilibrium length, andsimilarly for x2. If the combined double spring is stretched by an amount b ..
find the fraction of all the arrows you shoot that land outside a circle of some radius r0 as a function of r0. repeat
A tow truck is pulling a car out of a ditch by means of a steelcable (Y = 2.0 x 1011 N/m2) that is9.32 m long and has a radius of 0.396 cm. How much has the cable stretched
Assume that the mud ends up uniformly distributed over a surface area of the valley measuring 0.3 km x 0.3 km, What is the mass of the mud sitting above a 4 m2 area of the valley floor
a series of object are being rotated. the same net torque is being applied to each object. rank the object in order of
a 30 kg child on a sled slides down a frictionless slope angled at 15 degrees with respect to the horizontal. what is the magnitude of the wind force, F, such that the acceleration of the child is 1 m/s^2
An object is 2 m from the front side of a 1 m focal lenth converging lens. A second converging lens with focal length 2 m is placed 1 m from the first on the opposite side from the object. What is the new magnification
An 80.0-kg man jumps from a height of 2.50 m onto a platformmounted on springs, What is the man's speed at the instant he depresses the platform 0.120 m
An engine inlet decelerates the flow from M = 0.82 to M = 0.34 at the 3.5-ft diameter compressor face. What diameter should the inlet be
The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. What is the weight of the heaviest bear that the ice can support without sinking completely beneath the water
a rock of mass m 1.35 kg is dropped from a height of h 2.7 m into a pool of water. at a time of t 1.37 s after
A laboratory technician drops a 0.0850-kg sample of unknown material, at a temperature of 100.0C, into a calorimeter. The calorimeter can, Compute the specific heat capacity of the sample
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