Explanation:
As we know, resistance is the ratio of voltage used and current flowing through the circuit. So,
<h3>R = V/I</h3>
By error calculation
<h3>∆R/R = [(∆V/V)100] + [(∆I/I)100]</h3>
V = 100 ± 6% V
I = 10 ± 0.2% A
∆R/R= (5/100)×100 + (0.2/10)×100
∆R/R=5+2=7%
<h2>So, percentage error in resistance (R) = ± 7%.</h2>
Explanation:
No surface is perfectly smooth. Everything has irregularities, like bumps and ridges. Static friction is the friction between non-moving objects when their surfaces lock together. When an object is sliding, its surface skips and jumps along the surface of the other object. Because there's less locking between the surfaces, the sliding friction is less than the static friction.
The relationship between resistance R and resistivity
is
where L is the length of the wire and A its cross section.
The radius of the wire is half the diameter:
and the cross section is
From the first equation, we can then find the length of the wire when
(copper resistivity:
)
Answer:
Sharpening a knife reduces it's height as a wedge thus giving it more efficiency.
Explanation:
Mechanical advantage refers to the degree or quantity to which a force is increased or amplified by using a tool or a machine.
Mechanical Advantage can be calculated as follows:
Lenght of Incline (LI) / Height of Incline (HI)
Assume I have constructed a hedge with an inclination that run 10 meters from point x to point y (which is the back of a truck. Point y to the floor is 5 meters.
If LI = 10m and
HI= 5m
The mechanical advantage is given as 10/5 = 2
The angle of incline is also called the effort distance. From our calculations above, by sacrificing horizontal movement, I reduced the amount of effort it would have cost to lift up that object from ground up - a distance of 5 meters.
Think of a knife as a form of a similar wedge.
The more a knife is sharpening of a knife further reduces its angle of elevation. Thats why it becomes more efficient to use, hence our mechanical advantage.
Cheers
Answer:
around the nuclei of each atom
Explanation:
