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A long horizontal wire carries a current of IT = 46.9 A. A second wire (I), made of 3.00 mm diameter copper wire and parallel to the first but L = 13.8 cm below it, is held in suspension magnetically. (This means the upwards magnetic force on that lower wire is just large enough to hold it up against its own weight) What is the current in the lower wire (Use right as the positive direction)? (The density of copper is 8.93E3 kg/m^3)
A rod is 2.40 m long and has a diameter of 2.50 mm. What is the Young's modulus for this rod
A somewhat longer cable replaces the old and is attached to the steel bar 5 m from its upper end, connecting to the same place on the wall as before and maintaining the same angle between the bar and the wall.
A 1.0-kg block is pushed up a rough 22° inclined plane by a force of 7.0 N acting parallel to the incline. Determine the magnitude of the force of friction acting on the block
Assume that it takes 2.30 kg of oxygen to burn 1.00 kg of coal. (The actual amount varies with the type of the coal). What is the total mass of the reagents used in the combustion all through the 30 days.
In this problem, you will apply kinematic equations to a jumping flea. Take the magnitude of free-fall acceleration to be 9.80m/s^2. What is its initial velocity as it leaves the ground
An object of mass 45.0 g is initially placed in boiling water so that it is at 111° C. Then the object is dropped into a calorimeter, Find the specific heat of the object
Suppose your weight has been constant, but then - after being introduced to really good chocolate - you start eating 100 extra food calories (recall, 1 food calorie is really 1kcal or 1000 calories of energy) every day without otherwise adjusting ..
On a cool morning, when the temperature is 16 deg Celsius, you measure the pressure in your car tires to be 20.0 psi. After driving 40 mi on the freeway, temperature of your tires is 56.0 deg Celsius. What pressure will your tire gauge now show.
Find the lowest energy of the system (in electron volts) and list the quantum numbers of all occupied states. Find when the current in the solenoid increases to 5.0 A in a period of 0.90 s.
Sound with a frequency of 466 Hz travels through steel. What is the speed of the sound in steel?
How to find the magnetic field
Use work and energy to calculate the stopping force on an egg ( we will model it as an spherical object) that is dropped form a height of 2m
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