If there are no dissipative forces acting on the string, than the <em>principle of conservation of energy</em> holds.
When the string is relaxed, it has zero elastic potential energy
If we were strech the she spring, we would increase it's potential energy. After releasing the spring, when it's relaxed again, all potential energy will have been converted into kinetic energy.
Therefore, the elastic potential energy of the stretched spring should be equal to the amount of kinetic energy when it's relaxed
I think it's 0J because the man doesn't move the car.
W = F*d
W = 9000*0 (the car didn't move)
W = 0J
Answer:
The Gauge pressure at 9 meters depth is
Explanation:
Gauge pressure is the difference between absolute pressure and some reference pressure, most commonly atmospheric pressure. The increment in pressure caused by a static fluid is given by:
where is the density of the liquid, g is the accleration due to gravity and d is the depth.
Now, we see that is linearly proportional to d, and we can assume that remains constant, because liquids are usually not compressible.
Given that the greater depth is simply 3 times the smaller depth:
at of depth will also be three times the gauge pressure at of depth.
We could also have calculated ny using:
and used this result to calculate the gauge pressure. These are both similar methods that yield the same result
When a candle burns, the form energy that is being transformed from chemical energy would be heat energy and light energy. The flame is in the form of light energy. Also, <span>the wax melts and then volatilizes, so some energy is going into the material to do that, called latent heat.</span>
Answer:
808.25 seconds
Explanation:
From the relation,
If t = time
v = velocity
l = length
The current density, J, of a charge is given by:
Where number of charge carriers per unit volume n = 8.49 * 10²⁸
Charge of the electron, q = 1.6 * 10⁻¹⁹
Cross sectional area of the wire, A = 0.21 cm² = 0.000021 m²
Equating (1) and (2)
Since t = l/v.......(3)
Put the formula for v into equation (3)
t = 808.25 seconds