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When a potential difference of 12 V is applied to a wire 6.8 m long and 0.26 mm in diameter the result is an electric current of 3.0 A. What is the resistivity of the wire?
A beam of electrons passes undeflected through two mutually perpendicular electric and magnetic fields. E = 8kV /m and B = 2 × 10?3T. Determine the ratio of the electron charge to mass
A block of rock has dimensions of 2m x 2m x 2m and a density of 3000kg/m^3. The weight of the rock produces a normal stress on its bottom side. Calculate the magnitude of the normal stress on this side.
A block of mass m is initially at rest at the top of an inclined plane with a height = 6 m which makes and angle of ? = 25 degrees with respect to the horizontal. What is the speed of the block as it leaves the ramp
A child on a sled is initially at rest on an icy horizontal surface. Find the work done by the force pushing the sled
Visible light consists of photons having energies that range from 2.8×10?19 J to 5.0×10?19 J. What is the range of photon frequencies in visible light
A 0.40-kg iron horseshoe is dropped into 1.15L of water in a 0.34-kg iron pot initially at 20.0?C. Determine the initial temperature of the hot horseshoe.
The unstable isotope 234Th decays by beta emission with a half-life of 24.5 days. what is the decay rate after 37 days
A parallel-plate capacitor has a capacitance of c1 = 3.5 uF when filled with air and c2 = 23 uF when filled with a dielectric oil at potential difference of 12 V. What is the permittivity of this oil
A 42-g ball consists of a plastic spherical shell and a water-filled core. the shell has an outside diameter equal to 56.2 mm, What is the density of the plastic
An optical disk drive in your computer can spin a disk up to 10,000 rpm (about 1045 rad / s), what is the magnitude of the average angular acceleration of the disk
The work function of a particular substance is 4.15 × 10-19 J. What is the photoelectric cutoff wavelength for this material
A 14.40 kg block and a 25.3 -kg block are resting on a horizontal frictionless surface. Between the two is squeezed a spring (spring constant = 1108 N/m).
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