What is the mechanical advantage of the screw shown below?

See Explanation Below

Explanation:

Your question is incomplete; however, I'll provide you the steps to calculate the mechanical advantage of a screw.

First, it should be noted that the mechanical advantage of a screw is always greater than 1. This is so because the output force is always greater than the input force.

The output force refers to the force applied by the screw (e.g. the force applied to a screwdriver) while the input force is the force applied to the screw.

The ratio of these forces is what gives the mechanical advantage (M.A).

In other words, M.A is the ratio of the output force to the input force.

Mathematically, M.A = Output Force ÷ Input Force.

Take for instance:

Calculate the mechanical advantage of a screw that has an input force of 16 N and an output force of 20N.

Mechanical Advantage = 20N ÷ 16N

Mechanical Advantage = 1.25

Assuming a 4-inch, length for a lever arm and a 1/4-inch pitch for the thread.

We can find the mechanical advantage by getting the output force and input force.

Output = 2πr = 2 * 3.14 * 4 = 25.12

Input = ¼

M.A = 25.12/¼

M.A = 100.48

So, basically you divide the value of the output force by the input force to get the mechanical advantage.

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.