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a ray of light originating in oil n 121 is incident at the brewster angle upon a flat surface of a quartz crystal n
a game of tug of rope is being played the rope is being pulled with a force of 18 n east and 20 n west what is the net
a child sitting at the edge of a swimming pool sees a coin resting on the bottom of the pool the coin appears to be 20
you want to visit your friend ford prefect who lives in the vicinity of betelgeuse 425 light-years from earth that is
the wavelength of red light emitted by a 301-mw helium-neon laser is 626 nm if the diameter of the laser beam is 111 mm
the motor of a scout rocket uses up all the fuel and stops when the rocket is at an altitude of 200 km above the
the andromeda galaxy is at a distance of 21 x 1022 m from our galaxy the mass of andromeda is 6 x 1041 kg and the mass
free neutrons unlike those in the nucleus of an atom decay spontaneously into a proton an electron and an antineutrino
a spaceship approaching an asteroid at a speed of 06c launches a scout rocket with speed 04c at what speed is the scout
from her police car running at 70 mih officer k sends a radar signal of a 285 mm wavelength to an suv in front of her
when certain light rays pass from a vacuum into a block of an unknown material the measured index of refraction of the
a tornado siren emits 3000 w of sound power radialy equal in all directionsa what si the intensity of sound 400 m from
a block slides down a friction less incline ramp if the ramp angle is 150 deg and the length of it is 190 m find the
a bullet of mass 001 kg moving horizontally strikes a block of wood of mass 15 kg which is suspended as a pendulum the
consider a bright star in our night sky assume that its power output is 320 1028 w about 80 times that of the sun and
jim is speeding toward james island with a speed v 22 ms when he sees betsy standing on shore at the base of a cliff
one of the weapons considered for the star wars antimissile system is a laser that could destroy ballistic missiles
an automobile weighing 2000lbs travels due west at a constand speed of 70 mph the magnetic field in the area is a
x-rays with a wavelength of 00350 nm undergo compton scattering from a carbon target find the magnitude of the momentum
a straight 10-cm wire bent at its midpoint so as to form an angle of 90 degrees carries a current of 10 a it lies in
a hydrogen atom initially in the ground state absorbs a photon which excites it to the n 110 statea determine the
an unstable particle called the pion has a mean lifetimeof 25 ns in its own restframe a beam of pions travels through
the temperature of the surface of the sun is 6000k and its radius is 696000km how much energy is the sun radiating into
an electric point of 6 mill- coulomb is placed in the center of a metallic spherical shell of inner diameter 15 cm and
the electrons in a rigid box emit photons of wavelength 1484 nm during the transitiona what kind of photons are