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A Styrofoam box has a surface area of 0.79 m2 and a wall thickness of 2.0 cm. The temperature of the inner surface is 5.0°C, and the outside temperature is 24°C. If it takes 8.5 h for 5.0 kg of ice to melt in the container, determine the thermal conductivity of the Styrofoam.
A battery with an emf of 12.0 V shows a terminal voltage of 11.5V when operating in a circuit with two lightbulbs rated at 3.0 W, What is the battery's internal resistance
A circus clown weighs 900 N. The coefficient of static friction between the clown's feet and the ground is 0.4. What is the minimum pulling force that the clown must exert to yank his feet out from under himself
A 2.00 meter long, straight rod is 1.00 mm in diameter an is made of pure copper (specific gravity 8.93). What is the potential difference between the ends on the wire
A free electron and a free proton are exactly 0.70cm apart, Find the magnitude of the acceleration of the proton and Find the magnitude of the acceleration of the electron
If the coefficient of kinetic friction between the box and the roof is 0.55, with what speed must you push the box to have it gently come to rest right at the edge of the roof.
Two cars of collide in a glancing collision and stick together. Before the colli- sion the first car (mass of 500 kg) is moving with velocity 25 m/s at an angle of 30%u25E6 North of East, Determine the momentum of each car in a suitable Cartesian c..
A 5.0-, 0.732- wire is used to support two uniform 235- posts of equal length, What is the frequency of the sound this wire produces
An air-filled spherical capacitor is constructed with inner and outer shell radii of 7.00cm and 14.0cm, respectively. Calculate the capacitance of the device
At one point in a pipeline, water's speed is 3.30 m/s and the gauge pressure is 4.00×10^4 Pa. Find out the gauge pressure at a second point in the line 13.0 m lower than the first if the pipe diameter at the second point is twice that at the first.
A 245 turn coil has an area of 3.3 cm2 and rotates in a magnetic field of 0.5 T. What frequency will generate a maximum emf of 10 V
A circuit has a battery voltage of 12.0 V, a 5.60 pF capacitor and a 300 kOhm resistor. what energy is stored in the fully charged capacitor
A crane at a construction site lifts a concrete block with a mass of 440 kg from the ground to the top of a building with a height of 15.0 m
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