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A certain copper wire has a resistance of 14 ohm. Find at what point along its length the wire must be cut thus that the resistance of one piece is 4.0 times the resistance of the other. Determine what is the resistance of each piece?
A round object has a rotational inertia of I = ?MR2, where ? is a constant, M is its mass and R is its radius. What fraction of the total kinetic energy is rotational
A 256Hz sound wave in 20°C air propagates into the water of a swimming pool. What are the water-to-air ratios of the wave’s frequency, wave speed and wavelength?
A uniform rod of mass 3.05×10?2kg and length 0.410mrotates in a horizontal plane about a fixed axis through its center and perpendicular to the rod. What is the angular speed of the rod after the rings leave it
Calculate the work done by the force represented in displacing a particle from x = 1.0 meter to x = 4.0 meter. The curve is given by F = a/x2, with a = 21.0N m2. Determine the work using integration
A long solenoid of length 8m with a cross-sectional area of5.0x10 -5 m2 contains a total of 52,000 turns. Compute the self-inductance of the solenoid, assuming that the core of the solenoid is air.
A barrel contains a 0.130 {\rm m} layer of oil of density620 {\rm{{\rm kg}/{\rm m}}}^{\rm{3}}floating on water that is 0.290 {\rm m} deep. What is the gauge pressure at the bottom of the barrel
A 8.26 kg crate slides on a horizontal surface. The coefficient of kinetic friction between the surface and the crate is 0.362, what is the magnitude of the external force acting on the crate
A molecule of DNA (deoxyribonucleic acid) is 2.26 µm long. The ends of the molecule become singly ionized: Determine the effective spring constant of the molecule
a river flows due east at 3.0 ms. a boat crosses the 300 m-wide river by maintaining a constant velocity of 10 ms due
A supersonic jet flying at 145 m/s is accelerated uniformly atthe rate of 23.1 m/s2 for 20.0 s. How many times thespeed of sound is the planes final speed
Two freight cars, each with a mass of 3.0 x 105 kg, collide. One was initially moving at 2.2 m/s; the other was at rest. They stick together. What is their final speed?
you have a 500n box and you pull on the box with a rope that is horizontal. the floor is not frictionless. you pull on
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