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A wire with initial length L0 and radius r0 has measured resistance of 1.0 ohms. The wire is drawn under tensile stress to a new uniform radius of 0.25 r0. What is the new resistance of the wire? (assume the length of the wire changes as well)
A sailboat race course consists of four legs, defined by the displacement vectors , , , and , as the drawing indicates. find the distance of the fourth leg and the angle
For this experiment you will require a stand, string, a paper or plastic cup, a nail, a roll of paper towels or similar sized paper, coloured sand, or some other dry powdery product, and a ruler or measuring tape.
Your car's fan belt turns a pulley at 3.15rev/s . When you step on the gas for 1.55s , the rate increases steadily to 6.00rev/s, What's the pulley's angular acceleration
A gray kangaroo can bound across level ground with each jump carrying it 8.1m from the takeoff point. What is its maximum height above the ground
A 330-N sphere 0.20 m in radius rolls without slipping 6.0 m down a ramp that is inclined at 34° with the horizontal
Find the flux of the Earth's magnetic field of magnitude 5x10^-5, through a square loop of area 10cm^2 for the following
A certain fuel-efficient hybrid car gets gasoline mileage of 55.0 mpg (miles per gallon). If you are driving this car in Europe and want to compare its mileage with that of other European cars, express this mileage in km/l (liter).
An object, at the top of a very tall building, is released from rest and falls freely due to gravity. Neglect air resistance and compute distance covered by the object between times t1 = 5.5 s and t2 = 7.9 s after it is released.
A string of 13 identical Christmas tree lights are connected in series to a 127 V source. The string dissipates 63 W. What is the comparable resistance of light string.
Three 1.5-V batteries, with internal resistances of 0.01ohms , 0.1ohms , and 1ohms , what is the voltage across each resistor
A mass-spring system oscillates with period of 0.23 sec. The spring's spring constant k = 450 N/m. What mass is attached to the spring
On the planet Newtonia, a simple pendulum having a bob with a mass of 1.33kg and a length of 186.2cm takes 1.45s , when released from rest, What is the mass of the planet Newtonia
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