Answer:
resistor R₂ has the lowest current density
Explanation:
The current density is
j = I / A
now let's analyze each case
a) R₂ has an area 2A₀ and a length L₀ that R₁
b) R₃ has an area Ao and a length 3L₀ what R₁
we can see that all the area is given in relation to the resistance R₁
the current density in R₁ is
j₁ = I / A₀
the current density in R₂
j₂ = I / 2A₀
j₂ 2 = ½ I/A₀
the current density in R₃
j₃ = I / A₀
j₂ < j₁ = j₃
therefore resistor R₂ has the lowest current density
choice 3 because the arrow has to be downward for as. and if the divers want to live, the vx has to be going right and not 0 or they would hit the rocks. I hope it's right!
The diagram shows two charged objects, X and Y.
Answer
X: positive
Y: positive
A because on the EM (electromagnetic) spectrum you will see that the ones that start it out have longer wavelengths which mean they start out with low frequency. so since x-rays come after microwaves than x-rays have a shorter wavelength and a higher frequency.
Answer:
B) 4 m/s²
Explanation:
- Since the surface it's kept on is frictionless, the net external force acting on the block will be 220 N.
- Mass of the block = 55 kg

Here,
- F is the net external force applied to an object,
- m is the mass of that object, and
- a is the acceleration it acquires.
Substituting the respective values for F and m:
==> 220 = 55 × a
==> 220 = 55 × a
<em>dividing the equation by 55</em><em>:</em>
==> 4 = a
Therefore, an object of 55 kg when pulled across a <u>frictionless surface</u> by a force of 220 N accelerates at <u>4</u><u> (m/s)/s</u>