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23. Consider a copper wire (mass density 8.9 g/cc, resistivity 1.7E-8 ohm-m) with a diameter of 0.43 mm and a resistance of 91.9 ohms. How many meters long is this wire?
Lightning can be studied with a Van de Graaff generator, which consists of a spherical dome on which charge is continuously deposited by a moving belt, What is the maximum potential of the dome
If the ultimate shear strength of steel is taken to be 2.50x 10^9 Pa, what force is required to punch through a steel plate 2.2cm thick? Assume the superhero's fist has cross-sectional area of 8.00x 10^1 cm2 and is approximately circular.
A student decides to move a box of books into her dormitory room by pulling on a rope attached to the box, Find the acceleration of the box
What is the effective spring constant (that is, the ratio of force to change in length) of a copper cable that is 7.0 in diameter and 13 long?
A 10 kg weight is put on the weightless piston of the cylinder (20 cm in diameter) filled with oxygen gas (P=101.3kPa, V=1m^3). Calculate the volume of the compressed gas
A homogeneous disk of radius R and mass M rolls without slipping on a horizontal surface and is attracted to a point a distance d below the plane. find the frequency of oscillations around the position of equilibrium
A force applied to an object of mass m1 produces an acceleration of 3.60 m/s2. find its acceleration under the action of the force
express What is the light intensity on a wall. How far does the ball drop vertically by the time it reaches the plate 18.0 m away.
A dipole is formed by point charges +3.8 micro Coulomb and -3.8 micro Coulomb placed on the axis at (0.45 m, 0) and (-0.45m, 0), respectively. At what positions on the axis does the potential have the value 7.7×105 V?
At the instant the car begins to accelerate, a truck with a constant velocity of 21 m/s passes in the next lane. Explain how far will the car travel before it overtakes the truck?
A car carrying a 77-kg test dummy crashed into a wall at 27m/s and is brought to rest in 0.1 s. demonstrate that the average force exerted by the seat belt on the dummy is 18,760N.
What are the magnitude and direction of the resultant vector R , when the parallelogram law is applied to A and B?
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