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if a low-pressure sodium vapor lamp emits 50 w of yellow light how many photons does it emit each second please show
a city planner is working on the redesign of a hilly portion of a city an important consideration is how steep the
three indistinguishable balloons are given charges of -19 muc -25 muc and 20 muc respectively you are given two of
early black-and-white television sets used an electron beam to draw a picture on the screen the electrons in the beam
an electron is launched at 47x10 6 ms into a 28 t magnetic field what is the diameter of its
a capacitor is placed parallel across a resistive load in a circuit c085810-6f and r204 ohms what fraction of the
a 100 g cube of ice at 0 degrees c is dropped into 13 kg of water that was originally at 82 degrees c what is the final
x-rays are scattered from a target at an angle of 152deg with the direction of the incident beam find the wavelength
one of the asteroids asty looks like an elongated potato surprisingly it has a tiny compared to asty spherical moon
a black hole is roughly defined as a an object dense enough that the speed needed for launching things from its surface
a moto-cross rider is airborn after a jump each wheel of his bike has a rotational intertia of 760 kg m2 so the pair
in preperation for building a space station an astronaut removes a self-teliscoping uniform rod form the cargo bay and
a 15 kg box is skid down a 6 meter high ramp to pick up speed to do a veritcal loop-the-loop whose radius is 2 meters
in an l-r-c series circuit the resistance is 420 ohms the inductance is 0300 henrys and the capacitance is 120times102
the critical angle for total internal reflection for ice surrounded by air is 498deg calculate the brewster angle for
an object is located at a distance of 113 cm from a concave mirror of focal length 233 cm another concave mirror of
particles pass through a single slit of width 0233 mm the de broglie wavelength of each particle is 558 nm after the
calculate the de broglie wavelength for a proton moving with a speed of 63 times 106 ms the mass of a proton is 167262
a glass is half-full of water with a layer of vegetable oil n 147 floating on top a ray of light traveling downward
a siphon tube is filled with gasoline and closed at each end one end is inserted into a gasoline tank 015 m below the
a horizontal water main with a cross-sectional area of 188 cm2 necks down to a pipe of area 490 cm2 meters mounted in
a wire is stretched between two posts another wire is stretched between two posts that are four times as far apart the
the magnetic field perpendicular to a circular coil of 5 turns and diameter 20cm changes from 185 t to -25 t in 30 ms