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Consider a 1000-W iron whose base plate is made of 0.5-cm-thick aluminum alloy 2024-T6 (ρ = 2770 kg/m3 and cρ = 875 J/kg·°C). The base plate has a surface area of 0.03 m2. Initially, the iron is in thermal equilibrium with the ambient air at 22°C. Assuming 90 percent of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°C.
A 0.50 kg object on a 40 cm long string swings in a circle, on horizontal table, fritionless table. what is Tangential velocity of the block
Tests of lung capacity show that adults are able to exhale 1.5 liters of air through their mouths in as little as 1.0 second. If a person blows air at this rate through a drinking straw with a diameter of 0.60 cm, what is the speed of air in the stra..
a skier starts from rest at the top of a frictionless inclineof height 20.0m. How far does the skier travel on the rough horizontal surface
A wrecking ball is hanging at rest from a crane when suddenly the cable breaks, Find the time it takes for the ball to fall from rest all the way to the ground
Three equal point charges each with charge 1.45 μC are placed at the vertices of an equilateral triangle whose sides are of length 0.400m. What is the electric potential energy of the system. Take as zero the potential energy of the 3 charges when ..
The pressure-volume graph shows an engine cycle where the working substance is an ideal monatomic gas (? = 5/3). The process A-B is adiabatic. calculate the heat removed from the gas
The average coefficient of volume expansion for carbon tetrachloride is 5.81 10-4 (°C)?1. If a 48.5-gal steel container is filled completely with carbon tetrachloride when the temperature is 10°C, how much will spill over when the temperature rises t..
A rocket fires two engines simultaneously. One produces a thrust of 615 directly forward while the other gives a thrust of 474 at an angle 39.6 above the forward direction.
An object of mass 2.5 kg on a table is connected to a hanging object of mass 11.2 kg by means of a string via a pulley. Caculate the acceleration of the system
An unknown length of platinum wire 0.730mm in diameter is placed as the unknown resistance in a Wheatstone bridge. How long (in meters) is the platinum wire
A bicycle wheel of mass M (assumed to be concentrated at its rim) and radius R is mounted horizontally so it may turn without friction on a vertical axle. A dart of mass mo is thrown with velocity vo above and sticks in the tire.
The ball loses contact with the spring and leaves the gun when the spring is still compressed by 12 cm. Elucidate what is the speed of the ball when it hits the ground, 1.4 m below the spring gun?
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