We won’t be able to do it cuz we can’t draw on this app
Answer:
Option A
Solution:
As per the question:
Initially, voltage is 
Current is 'I' A
Length of the wire is L
Now,
We know that:
(1)
where

A = Cross sectional area of the wire
From eqn (1), if other things are taken to be constant, then
R ∝ L (2)
Thus
When the wire is cut into two reducing the length to 
Resistance, R' = 
Now, when these wires are connected as described, the connection is in parallel, therefore, the equivalent resistance of the two wires:



Now, from Ohm's law:

Since, according to the question voltage
is constant, thus
I ∝ 
I ∝ 
Thus
I becomes 4I
Answer:
Efficent at low speeds.
Explanation:
Since water is 1,000 times more dense than air, electricity can generated from tides much more efficiently at slower speeds than wind turbines can.
Answer:
ΔK.E. = - 142.72 kJ
Explanation:
mass = 884 kg
initial velocity = 68 km/h = 68 \times \frac {5}{18} = 18.89 m/s
final velocity = 0 m/s
height = 69 m
change in kinetic energy :
ΔK.E. = 
ΔK.E. =
ΔK.E. =-142,716.05 J
ΔK.E. =-142.72 kJ
hence change in kinetic energy of the automobile is -142.72 kJ
Answer:
surface temp of fuel rod = 678.85 K
Explanation:
Given data :
D1 = 25 mm
D2 = 50 mm
T2 = 335 k
T∞ = 300 k
hconv = 0.15 w/m^2.k
ε2 = 0.05
ε1 = 1
Determine energy at Q23
Q23 = Qconv + Qrad
attached below is the detailed solution
Insert given values into equation 1 attached below to obtain the surface temperature of the fuel rod ( T1 )