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when a single high-resistance long bulb is connected to a 15 volt battery the current through the battery is about 80
at what depth under water does the pressure increase by 100000 pa the earth rotates with a period of one day what is
a 1000n beam is loaded with a 2000n filing cabinet and supported by two cables if the beam is 8 meters long and the
a 02kg toy car rolls down ramp if the car started from rest at a height of 030m what is its speed at the bottom of the
one string of a certain musical instrument is 720 cm long and has a mass of 876 g it is being played in a room where
a 100 w lightbulb is plugged into a standard 120 v outlet how much does it cost per month 30 days to leave the light
a potential difference of 480 v will be applied to a 4300 m length of 18-gauge copper wire diameter 00400inches
a nichrome heater dissipates 450 w when the applied potential difference is 110 v and the wire temperature is 700degc
an aluminum cylinder is suspended in an unknown fluid by a spring scale outside the fluid the object weighs 20n in the
a small rock with mass 012 is fastened to a massless string with length 080 to form a pendulum the pendulum is swinging
two conductors are made of the same material and have the same length conductor a is a solid wire of diameter 10 mm
calculate the temperature at which a tung- sten filament that has an emissivity of 025 and a surface area of 66times105
a 300- length of copper wire at 20 has a 120--long section with diameter 18 and a 180--long section with diameter 090
a pipe 0026 m in diameter and 022 m long can transfer 3476 j of heat per second with a temperature difference across
a student sits on a swivel seat initially the student is at rest holding a spinning bicycle wheel that has an angular
a thermopane window of area 68 m2 is constructed of two layers of glass each 54mm thick and separated by an air space
a rock group is playing in a bar sound emerging from the door spreads uniformly in all directions the intensity level
please answer both parts a and ba the decibel level of the noise from a jet aircraft is 130 db when measured 168 m from
a typical decibel level for a buzzing mosquito is 40 db and normal conversation is approximately 50 db how many buzzing
over 500 planets have so far been detected beyond our solar system this is accomplished by looking for the effect the
a baseball coach shouts loudly at an umpire standing 38 meters away if the sound power produced by the coach is 22
a 1000kg car moving 40ms skids to a stop during the skid the only force is the frictional force between the tires and
two cars collide at an intersection car a with a mass of 2000 kg is going from west to east while car b of mass 1400
a piano wire with mass 345 g and length 770 cm is stretched with a tension of 330 n a wave with frequency 100 hz and
ball 1 with a mass of 110 and traveling at 140 collides head on with ball 2 which has a mass of 320and is initially at