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A 1.0kg grindstone in the shape of a uniform cylinder of radius 0.25m acquires a rotational rate of 18 rev/s from rest over a 6.4s interval at constant angular acceleration. Calculate the torque delivered by the motor
Two objects have the same kinetic energy. One has a speed that is 1.7 times greater than the speed of the other. What is the ratio of their masses
An oil drop (density = 0.80 grams/cm3) has a diameter of 2.30 ?m. (This is about the size of a bacterium.) (A) Find the mass of the drop, What is the value of the electric field
Two circular metal plates of radius 0.17 m and thickness 8.5 mm are used in a parallel plate capacitor. A gap of 1.7 mm is left between the plates, What is the capacitance of this capacitor
An object of length 3 cm is inside a plastic block with index of refraction 1.40. If the object is viewed through the top surface of block at a non-zero angle from the normal, where is an object relative to its image.
q1. a proton travels with the speed of 8.34times105 ms at an angle of 32.3deg with the direction of a magnetic field.
In the Bohr model of the hydrogen atom, an electron moves in a circular path around a proton. The speed of the electron is approximately 2.19 106 m/s. Find the centripetal acceleration of the electron
Calculate the rates of solar heating
To treat a burn on your hand, you decide to place an ice cube on the burned skin. How much heat is absorbed by the ice cube and resulting water
A light ray propagates in a material with index of refraction 1.13, strikes an interface, and passes into a material whose index of refraction is 1.41, Find the angle of refraction
A cockroach of mass m lies on the rim of a uniform disk of mass 7.00 m that can rotate freely about its center like a merry-go-round. obtain the angular velocity of the cockroach-disk system
In addition to the line, lambda = 2537 angstroms, the mercury spectrum has a strong line at lamda = 1849 angstroms. In an experiment, at what voltage would one expect a current drop associated with the second line?
An electric field E with an average magnitude of about 150 N/C points downward in the atmosphere near Earth's surface, What charge (both sign and magnitude) must be used
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