Astudent solving for the acceleration of an object has applied appropriate physics principles and obtained the expression a=a1 + f/m where a1 = 3.00 meter/ second2 f=12.0 kilogram. meter/second2 and m=7.00 kilogram. first which of the following is the correct step for obtaining a common denominator for the two fractions in the expression in solving for a?
(m/m times a1/1) + (1/1 times f/m)
(1/m times a1/1) + (1/m times f/m)
(m/m times a1/1) + (f/f times f/m)
(m/m times a1/1) +(m/m times f/m )
choose the correct answer choice i put the word times to repersent the dot of multiplcation .

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

at right angles to each other