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A camber carriers her drinks in an ice chest made of styrofoam. The chest is 40 cm x 45 cm x 70 cm, and the walls and lid are 2.5 cm thick. The contents of the chest are ice, water, cans of soda drinks, and other food, all of which are in thermal equilibrium with the ice water. The temperature just outside the ice chest is 35 degrees Celsius. What is the rate of heat flow through the walls of the box? The thermal conductivity of styrofoam is 0.010 W/ (m*K)
An airplane flying horizontally 3600 ft above the ground at 120mi/hh, drops relief aid on the ground. Resolve the angle between the vertical and the line joining plane and target at the instant when he package is released.
A circuit consists of a 12.0-V battery connected to three resistors (44ohm , 17ohm and 110ohm ) in series. Find the current that flows through the battery.
A ball is thrown toward a cliff of height h with a speed of 31m/s and an angle of 60 degrees above horizontal. What was the maximum height of the ball
light of wavelength 600nm is incedent normally on a surface of area 4 cm^2. Determine the power output of the light source
A circular loop with radius of 25 cm is placed in a B field so that the normal of the loop plane is parallel to the B field. What is the magnitude of the induced emf now
A student is reading a lecture written on a blackboard. If the writing on the blackboard is 4.80 cm high, what is the size of the image on her retina
An extension cord is used with an electric weed trimmer that has a resistance of 18.3 ?. Determine the resistance of the extension cord
A 65.0 kg object slides down a 30o angle slope from rest at a height of 15.0 m. The coefficient of kinetic friction between the object, find vthe object's speed at the bottom of the slope
If 55.0 cm of copper wire (diameter = 1.00 mm) is formed into a circular loop, at what rate is thermal energy generated in the loop
A solenoid is formed by winding 16.0 m of insulated silver (resistivity 1.59 x 10-8 ?·m) wire around a hollow cylinder. The turns are wound as closely as possible without overlapping, and the insulating coat on the wire is negligibly thin.
A 60kg student carrying a 5.0kg school bag walks up to flights of stairs in 30 seconds to reach the library. How much power did the student generate
If the tension in a guitar string is increased by 20%, by what percentage does the wave speed increase
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