HURRY!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Let's call h the initial height of the rock (h=50 m, the height of the bridge).
Initially, the rock has only gravitational potential energy, which is given by
where m=10 kg is the mass of the rock while g is the gravitational acceleration. So, the total mechanical energy of the rock at this point is
At midway point of its fall, its height is
, so its potential energy is
But now the rock is also moving by speed v, so it also has kinetic energy:
So the total energy at the midway point of the fall is
(1)
The mechanical energy must be conserved, so
, so we can rewrite (1) and solve it to find the kinetic energy of the rock at midway point of its fall:
Initially, the rock has only gravitational potential energy, which is given by
where m=10 kg is the mass of the rock while g is the gravitational acceleration. So, the total mechanical energy of the rock at this point is
At midway point of its fall, its height is
But now the rock is also moving by speed v, so it also has kinetic energy:
So the total energy at the midway point of the fall is
The mechanical energy must be conserved, so
Answer: Heat current through the insulator=196W
Electric power= 196W
Explanation: Given: Kglass = 0.040W/m
Temperature of inside glassTi=175°C
Temperature of outside glass To= 35°C
Area=1.4m^2 , L= 4×10^-2
Heat current(H)= K ×A× (Ti - To)/L
Substituting the values into the equation
H = 0.04 × K × 1.4 ×(175-35)/4×10^-2
H= 196W.
The electric power = Heat current =196W
The electric power is the magnitude of heat current
This is third equation of motion. As there is no values given, I assume you just have to keep variable 'a' (representing acceleration) on one side of the equation and all other variables on the other side.
OR
Here, is initial velocity,
is final velocity ,
is initial position,
is final position, and
a is acceleration.