Answer:
See the answer below.
Explanation:
The latent heat of fusion is defined as the amount of energy needed to make a phase change from solid to liquid. And it can be calculated by means of the following expression:
where:
Qfusion = Heat Energy [J]
m = mass = 0.65 [kg]
Dh = latent heat fusion = 330000[J/kg]
![Q_{fusion}=0.65*330000\\Q_{fusion}=214500[J]](https://tex.z-dn.net/?f=Q_%7Bfusion%7D%3D0.65%2A330000%5C%5CQ_%7Bfusion%7D%3D214500%5BJ%5D)
2)
We know that energy can be calculated from power, where power is defined as the relationship between energy over time.
where:
P = power = 60 [w]
E = energy [J]
t = time = 5 [min] = 300 [s]
![E=P*t\\E=50*300\\E=15000[J]](https://tex.z-dn.net/?f=E%3DP%2At%5C%5CE%3D50%2A300%5C%5CE%3D15000%5BJ%5D)
The mass change due to the process is equal to:
![m=282-274\\m=8[g]=0.008[kg]](https://tex.z-dn.net/?f=m%3D282-274%5C%5Cm%3D8%5Bg%5D%3D0.008%5Bkg%5D)
Now using the following equation for the latent heat of Fusion, we can calculate this value:
![Q=m*Dh\\Dh =Q/m\\Dh=15000/0.008\\Dh=1875000[J/kg]](https://tex.z-dn.net/?f=Q%3Dm%2ADh%5C%5CDh%20%3DQ%2Fm%5C%5CDh%3D15000%2F0.008%5C%5CDh%3D1875000%5BJ%2Fkg%5D)
Answer:
0.73 W/m²
0.2522 W/m²
Explanation:
= Unpolarized light = 1.46 W/m²
= Analyzer angle = 54°
Light through first filter
The intensity of the light leaving the polarizer is 0.73 W/m²
After passing through analyzer
The intensity of the light that reaches the photocell is 0.2522 W/m²
Answer:
5572.8 N
Explanation:
Applying,
F = ma.............. Equation 1
Where F = Force, m = mass of the car, a = acceleration.
We can find a by applying,
v² = u²+2as............. Equation 2
Where v = final velocity, u = initial velocity, a = acceleration, = distance.
From the question,
Given: v = 0 m/s (come to rest), u = 1.7 m/s, s = 0.210 m
Substitute these value into equation 2
0² = 1.7²+2×0.21×a
a = -1.7²/(2×0.21)
a = -2.89/0.42
a = -6.88 m/s²
Also given: m = 810 kg
Substitute these value into equation 1
F = 810(-6.88)
F = -5572.8 N
Hence the force on the bumber is 5572.8 N
Since they are travelling on two different straight
directions, therefore their paths will NEVER cross again. This because straight
lines will keep on going forever on the same direction therefore there is 0
possibility for two straight lines to paths cross again.
Answer:
<span>zero or never</span>
