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A person Walks 25 m west and then 45m at an angle of 60 degrees north of east. Estimate the magnitude of the displacement?
The filament of anincandescent lightbulb is a thin tungsten wire. Suppose a lightbulbhas a resistance of 42 Ω at room temperature. During normal operation, the filament reaches atemperature of about 2990 K.
What is the average distance between nitrogen molecules at atemperature of 0.4 ° C and a pressure of 0.05 atm
An automobile emits 20 lbs of CO2 per gallon of gasoline burned. If the U.S. burns 200 million of gallons of gasoline every year, how many billions of lbs of CO2 are emitted every year?
how many joules of potential energy does 1.5-kg book gain when it is elevated 2 m? when it is elevated 4 mlet g 10
Each plate of a parallel-plate air-filled capacitor has an area of 0.0020 m2, What is the surface charge density on the plates
An object of mass 0.550 kg is lifted from the f loor to aheight of 3.50 m at a constant speed. How much work is done by the Earth on the object
Future space stations will create an artificial gravity by rotating. What rotation period will provide "normal" gravity
An airplane is flying through a thundercloud at a height of 2400 m. (Flying at this height is very dangerous because of updrafts, turbulence, and the possibility of electric discharge.)
A 69.20-kg free runner jumps off a wall at a velocity of 6.95 m/s at an altitude of 2.37 m above the ground. What is the free runner's kinetic energy when he jumps off the wall
A centripetal force of 258 N is experienced by a 0.625 gram object as it is spun in a circular path with a radius of 3.50 meters. What is the frequency of the object in RPM
Discuss Waves, Sound, and Light. What is a Wave?
What is the coefficient of kinetic friction between the table and floor.
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