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Explanation
The equation for net force is F(net) = m_a. This equation represents Newton's second law of motion, which states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration. The letter "a" in the equation represents the acceleration of the object. Therefore, the correct answer is a.

Explanation
The correct answer for this question is "n". The equation for the force of friction is F(fric) = μF(n), where μ is the coefficient of friction and F(n) is the normal force. The normal force is the force exerted by a surface to support the weight of an object resting on it. Therefore, "n" is the correct choice as it represents the normal force in the equation for the force of friction.

Explanation
The equation for torque, τ = r_sinθ, states that torque is equal to the product of the distance from the pivot point (r) and the perpendicular force applied (F). This equation is derived from the concept of rotational motion, where torque represents the rotational force acting on an object. Therefore, the correct answer is F, representing the perpendicular force applied.

Explanation
The equation for centripetal acceleration is a = v²/r. This equation represents the relationship between the centripetal acceleration (a), the velocity (v), and the radius (r) of an object moving in a circular path. The centripetal acceleration is directly proportional to the square of the velocity and inversely proportional to the radius. This means that as the velocity increases, the centripetal acceleration also increases, and as the radius increases, the centripetal acceleration decreases. Therefore, option c is the correct answer as it correctly represents the equation for centripetal acceleration.

Explanation
The equation for momentum is represented by the letter "p" in physics. It is calculated by multiplying an object's mass (m) by its velocity (v). This equation shows that momentum is directly proportional to both mass and velocity. Therefore, the correct answer is "p".

Explanation
The equation for net force is represented by the symbol "F" followed by "net". This equation is used to calculate the net force acting on an object, which is equal to the mass of the object multiplied by its acceleration (F = ma). The term "net" in the equation indicates that it refers to the total force acting on the object, taking into account all the individual forces acting on it.

Explanation
The equation for the force felt by a charged particle in an electric field is F = q. This equation represents the relationship between the force (F) experienced by a charged particle, the charge of the particle (q), and the electric field. The force is directly proportional to the charge of the particle, meaning that a larger charge will experience a stronger force in the electric field.

Explanation
The equation for voltage is V = I * R, where V represents voltage, I represents current, and R represents resistance. In this equation, the voltage is equal to the current multiplied by the resistance. Therefore, the correct answer is R.