O A ring made up of equal semicircular section of cast inn and castutool with two air gaps of olmm and 0.25mm respectively has across sectional area
of 400 cm? and
a mean diameter of sm. The ring is uniforanly wound with a coil
41200tums II the relative permeability of cast iron and cost osteel aro 280061d
400 respectively, determine the corrent required to produce a Flor of lomub in
ring.
the​

Free runners jump long distances and land on the ground or a wall. how do they apply newton’s second law to lessen the force of impact?

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?

Does anyone know how to solve this problem? i really need . i made an attempt but i just cant get it. a metal rod is 25.000 cm long at 25.0 degrees celsius. when heated to 102.0 degrees celsius, it is 25.054 cm long. what is the coefficient of linear expansion for this metal.