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An air conditioner draws 13 A at 220V ac. The connecting cord is copper wire with a diameter of 1.528mm.
a) If the total length of the wire is 17 how much power is dissipated in the writing?
b) If no. 12 wire, with a diameter of 2.053 mm , was used instead, how much power would be dissipated?
c) Assuming that the air conditioner is run 11 hr per day, how much money per month (30 days) would be saved by using no. 12 wire? Assume that the cost of electricity is 12 cents per kWH.
Helium-neon laser light (632.8nm) is sent through a 0.3nm-wide single slit. What is the width of the central maximum on a screen 1m in back of the slit
four charges are evenly spaced along the x axis with a separation distance d3cm. the values of the charges are q1 2
A gray kangaroo can bound across a flat stretch of ground with each jump carrying it 11 from the takeoff point. If the kangaroo leaves the ground at a 21 angle, what is its takeoff speed
Two blocks are connected by a very light string passing over a massless and frictionless pulley (Fig. E6.7). Traveling at constant speed, the 20.0-N block moves 75.0 cm to the right and the 12.0-N block moves 75.0 CIJl downward.
A rotating fan completes 1200 revolutions every minute. Consider a point on the tip of a blade, at a radius of 0.16 m. Through what distance does the point move in one revolution? What is the speed of the point?
Three capacitors numbered 1, 2 & 3, each have the same value of capacitance, What is the effective total capacitance
In 1993 a giant 400-kg yo-yo with a radius of 1.5 m was dropped from a crane at height of 57 m, estimate its linear speed at the end of the fall
A 1.90 m length of wire is held in an east-west direction and moves horizontally to the north with a speed of 15.2 m/s. Calculate the induced emf between the ends of the wire
Donovan Bailey set a world record for the 100-m dash on July 27, 1996. If observers on a spaceship moving with a speed of 0.7705 c relative to Earth saw Donovan Bailey's run
A motor boat haeds due east at 5 m/s acorss a river that flows toward the south at 5 m/s. If the river is 125m wide, how longs does it take the boat to cross the river.
Earthquakes generate sound waves inside Earth. Unlike a gas, Earth can experience both transverse (S) and longitudinal (P) sound waves, how far away did the earthquake occur
Two equally charged insulating balls each weigh 0.26 g and hang from a common point by identical threads 25 cm long. find the magnitude of the charge on each ball
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