Answer:
(a) 53.94%
(b) 26.61%
Explanation:
Change in area will be given by
where 
represent change in area R is radius and subscripts O and n represent original and new respectively.
Substituting 10.55/2 for original radius and 7.16/2 for new radius then
(b)
Similarly, percentage elongation will be found by dividing the change in length by the the original length. In this case, rhe original length was 54.5mm and goes to 69 mm so the change in length is given by subtracting the final length from the original length
Percentage elongation is 
Answer:
See explaination
Explanation:
LM358 is the useful IC which works as buffer. It enables circuit to remove overloading effect on each other. Image is in attachment.
We can define a light-emitting diode (LED) as a semiconductor light source that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons
See attached file for detailed solution of the given problem.
Answer:
r₂ = 1.5 ft
t = 0.75 s
Explanation:
W = 4 lb ⇒ m = W/g = 4 lb / 32.2 ft/s² = 0.12 slug
v₁ = 6 ft/s
r₁ = 3 ft
v₂ = 12 ft/s
r₂ = ?
t = ?
vr = 2 ft/s
Conserving angular momentum we have:
m*v₁*r₁ = m*v₂*r₂ ⇒ r₂ = v₁*r₁ / v₂
⇒ r₂ = (6 ft/s*3 ft) / (12 ft/s) = 1.5 ft
Now, we get the time as follows:
vr = <em>d</em> / t ⇒ t = <em>d</em> / vr
where <em>d</em> is
<em>d</em> = Δr = r₁ - r₂ = 3 ft - 1.5 ft = 1.5 ft
finally
t = 1.5 ft / 2 ft/s
⇒ t = 0.75 s
Explanation:
Pressure = force/area
Pressure stays the same.
If the area is doubled the force is doubled.
