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An electromagnetic wave with a frequency of 7.20×10^14Hz propagates with a speed of 2.30×10^8m/s in a certain piece of glass. Find the dielectric constant for glass at this frequency, assuming that the relative permeability is unity.
Suppose a planet is discovered orbiting a distant star with 11 times the mass of the Earth and 1/11 its radius. How does the escape speed on this planet compare with that of the Earth
. Once the crate has started to move, expalin how large must F be in order to keep the crate moving at a constant speed?
A cup of coffee is on a table in an airplane flying at a constant altitude and a constant velocity, What is the maximum acceleration that the plane can have without the cup sliding backward on the table
A 3.00-kg mass undergoes an acceleration given by a = (2i+5j ) m/s2. The magnitude of the net force is
An open-tube mercury manometer is used to measure the pressure in an oxygen tank. When the atmospheric pressure is 990 mbar, what is the absolute pressure (in Pa) in the tank if the height of the mercury in the open tube is 27.0 cm higher than the..
A 490 kg cannon fires a 9.0 kg cannonball with a speed of 200 m/s relative to the muzzle. what is the speed of the cannonball relative to the earth
A 150 g mass hangs from a fishing line. If it falls and accelerates at 4.0 m/s^2, what is the tension in the fishing line
A thin uniform rod (length = 10.0 cm, mass = 250 g) is pivoted about a horizontal frictionless pin through one end of the rod
define How fast are the waves moving.
A projectile is launched at an angle of 34^{\circ} above the horizontal. The projectile has a mass of 1.50 kg and is given an initial speed of 20.0 m/s. What is the initial kinetic energy of the projectile
The reel has radius R and moment of inertia I. One end of the block of mass m is connected to a spring of force constant k, and the other end is fastened to a cord wrapped around the reel. The reel axle and the incline are frictionless. The reel i..
A conducting rod with a length of 25 cm is placed on a U-shaped metal wire that has a resistanceRof 8.0 ? as shown in the figure. The wire and the rod are placed in the plane of the paper.
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