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a radio reciever can pick up signals with peak electric fields as weak as 425muvm what is the average intensity of such
a 50lb sack of portland cement is dropped from rest onto the scale from a height h 4ft measured from the scales plate
an optical engineer needs to ensure that the bright fringes from a double slit are 157 mm apart on a detector that is
in a youngs double slit experiment two rays of monochromatic light emerge from the slits and meet at a point on a
a farsighted person has a near pont that is 67cm from her eyes she wears eyeglasses that are designed to enable her to
a 1500 kg car is approaching the intersection at 11 ms he is 40 m away from the intersection find the minimum
a student is reading material written on a blackboard her contact lenses have a refractive power of 5750 diopters the
in an l-r-c series circuit l0500 h r3800 ohms and c750 microf the voltage amplitude of the source is 2500 v find the
an object is 18cm in front of a adiverging lens that has a focal length of -12cm how far in front of the lens should
a series ac circuit consists of a voltage source of frequency f60 hz and source voltage amplitude 345 volts a resistor
an object is placed to the left of aa lens and a real image is formed to the right of the lens the image is inverted
a 40 kg mess kit sliding on a frictionless surface explodes into two 20 kg parts one moving at 10 ms due north and the
a 200 kg crate sits at rest at the bottom of a 129 m long ramp that is inclined at 33 degrees above the horizontal a
suppose the first stage of a two-stage rocket has total mass 130times104 kg of which 110times104 kg is fuel the total
a point source of light is submerged 22m below the surface of a lake and emits rays in all directions on the surface of
the drawing shows a coin resting on the bottom of a beaker filled with an unknown liquid a ray of light from the coin
a cannonball is shot from a cannon on a cliff at a height of 124 m at a ship on the ocean the cannonball is shot with
a large cold 120 c block of iron is immersed in a tub of hot 997c water in the first 100s 100 kcal of heat are
the light goes through a second polarizer and exits with an intensity of 225 wm squared what is the orientation angle
an lc circuit has zero resistance no battery a capacitor c70microfarads and an inductor l06h connected in a simple loop
an old wooden tool is found to contain only 24 of 14 6c that a sample of fresh wood would how old is the
rumor has it that a photographic camera on a spy satellite can read the license plate of an automobile on the ground to
a projectile launcher has a muzzle velocity of 15ms and is aimed 60 degree above the horizontal the projectile
an 8 meter ladder is leaning against a frictionless wall making a 60 degree angle with the ground a fireman whose
ted is traveling on his railroad car length 30 m at speed v 06 c as shown in the figure as measured on alices clock