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A tiny air bubble inside a glass slab appears to be 6 cm deep when viewed from one side and 4 cm deep when viewed from other side. find the thickness of slab
A 4.00-m length of light nylon cord is wound around a uniform cylindrical spool of radius 0.500 m and mass 1.00 kg. How much work has been done on the spool when it reaches an angular speed of 8.40 rad/s
Atoms of lithium are able to absorb photons of frequency 2.01 x 1014 Hz. This corresponds to a transition state from the ground state (at -5.37 ev) to an excited state. Zero energy corresponds to the state in which one electron is completely rem..
consider a black body of surface area 20 cm2 and temperature 6000 k.a how much power does it radiate?b at what
A car of mass 1,800 kg is initially traveling at a speed of 15 m/s. Calculate the change in the kinetic energy of the car
A 1100-kg car is moving at 31.8 m/s. A braking force of -5101 N is applied for 4.80 s. What is the velocity of the car when the brakes are released
an airplane is traveling at 117 mph relative to the air 13 degrees e of n at an altitude of 5000 ft. it encounters a
A wave of amplitude Ai and wave number ki is incident on the junction of two strings. If the wave number in the second string is kt = 2ki , find the amplitudes of the transmitted and reflected waves.
Two and one-half kg of ice at temperature T' = 0ºC is melted into water at the same temperature by placing it in contact with a reservoir at temperature TR = 20.0ºC. find the change in entropy of the ice that was melted
the speed of light in a certain material is measured to be 2.2*10^8 m/s. what is the index of refraction of this material
an object is released from rest on a planet that has no atmosphere. the object falls freely for 3.79 m in the first
a street light is supported by two wires and each makes a different angle from each other. the one on the left is 32
A 70 kg window cleaner uses a 20 kg ladder that is 5.4 mlong. He places one end on the ground 2.2m from a wall, What is the angle of this force on the ladder
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