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light in vacuum is incident on the surface of a slab oftransparent material in the vacuum the beam makes an angle
a recording engineer works in a soundproofed room that is520 db quieter than the outside if the sound intensity in the
a simple pendulum consists of a ball connected to one end of athin brass wire the period of the pendulum is 181 s
a styrofoam box has a surface area of 080 m2 and a wallthickness of 20 cm the temperature of the inner surface is50
in a hydraulic system the piston on the left has a diameterof 51 cm and a mass of 17 kg the piston on the right has
when four people with a combined mass of 319 kg sit down in acar they find that the car drops 25 cm lower on its
one gram of water changes from liquid to solid at a constantpressure of 100 atm and a constant temperature of 0degc in
in a water tank experiment water waves are generated withtheir crests 25 cm apart and parallel they pass though
a tire is filled with air at15degc to a gauge pressure of 210kpa if the tire reaches a temperature of 36degc what
an object has a total energy of 50x1015 j and a kinetic energy of 20x 1015 j what is the magnitude of the objects
two point charges 20cm apart have an electric potential energy of -1188muj the total charge is 25 nc what are the two
the suspended 28 kg mass on the right is moving up on a pulley the 16 kg mass slides down the 21 degree ramp and the
two circular coils of current-carrying wire have the same magneticmoment the first coil has a radius of 0082 m has 144
a block with a weight of 30 n is at rest on a horizontalsurface a 10 n upward force is applied to the block by meansof
a cylinder containing an ideal gas has a volume of 20 m3 and apressure of 10 times 105 pa at a temperature of 300 k
1 an astronaut weighs 882 n on earth determinethe weight of the astronaut on the planet x which has a mass 953times
a stream of oilwith specific heat 24 kjkg k flowing at 1000 kghr is to becooled from 130degc to 80degc in a heat
a bat crashes into the vertical front of an accelerating subwaytrain if the coefficient of friction between the bat and
a small package is fired off earths surface with an unknown launchspeed at a 420circ angle with the localhorizontal it
a ball swings in a vertical circle at the end of a rope 150 mlong attached to the ceiling when the rope is 369 degrees
a planets moon travels in an approximately circular orbit ofradius 70 x 107 m with a period of 6 h 29 min calculate the
a star of mass 20 1028 kg that is 46 x 1020 m from the center of a galaxyrevolves around that center once every 46 x
a certain material is in a room at 27degc if the absolute temperature k of the material is tripled its resistance
a 615-kg racing car completes one lap in 143 sec arounda circular track with a radius of 500 m the car moves at
two skaters one with mass of 58 kg and the other with mass 41 kg stand on an ice rink holding a pole of length 95m and