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A length of wire is cut into7 equal pieces. The 7 pieces are then connected parallel, with the resulting resistance being 1. What was the resistance r of the original length of wire? Answer in units of Ω.
A spherical pot of hot coffee contains 0.75 L of liquid (essentially water) at an initial temperature of 95?C. Calculate the coffee's rate of heat loss by radiation
A 2500mL- flask is initially open to air at 24 celsius and 1 atm pressure. How many moles escape when the air is released
Cube of ice is taken from the freezer at -8.5°C and placed in a 75-gram aluminum calorimeter filled with 300.0 grams of water at room temperature of 20.0°C. The final situation is observed to be all water at 17°C. What was the mass of the ice cub..
question1. nbspgravity you shouldnrsquot need a calculator for these problems a sum up the universal law of gravitation
A "swing" ride at a carnival consists of chairs that are swung in a circle by 12.0 m cables attached to a vertical rotating pole, as the drawing shows. Determine the tension in the cable attached to the chair
An electron is released from rest at the negative plate of aparallel plate capacitor and accelerates to the positive plate. The plates are separated by a distance of 1.4 cm, and the electricfield within the capacitor has a magnitude of 2.2 x 106V/..
A 120-V motor has mechanical power output of 2.60 hp. It is 85.0% efficient in converting power that it takes in by electrical transmission into mechanical power. Find the energy delivered to the motor by electrical transmission in 3.20 h of operat..
airplane flight recorders must be able to survive catastrophic crashes. therefore they are typically encased in
You are trying to slide a refrigerator across a horizontal floor. The mass of the refrigerator is 188kg, and you require to exert a force of 347N to make it just begin to move. What is the coefficient of static friction between floor and refrigera..
you are in a hot-air balloon that relative to the ground has a velocity of 6.28 ms in a direction due east. you see a
Assume that the universe is a spherical cavity with a radius of 10^26 m and temperature of 2.7 K. How many thermally excited photons are there in the universe
A small piston with area A1 = 45 cm^2 acts in a cylinder to lift a larger piston A2 = 550 cm^2 Find the force on the small piston (F1) if the pressure in the system is 7000 pascals.
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