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:
3,150,000N
Explanation:
According to Newton's second law;
F = mass * acceleration
Given
Mass = 45000kg
acceleration = 70m/s^2
Substitute
F = 45000 * 70
F = 3,150,000N
Hence the force required to be produced by the rocket engines is 3,150,000N
Potential difference is difference of potential (between points).
Answer:
23.5
Explanation:
Dunno how 2 explain but this is correct 4 sureeeeee.
In order to solve this problem, there are two equations that you need to know to solve this problem and pretty much all of kinematics. The first is that d=0.5at^2 (d=vertical distance, a=acceleration due to gravity and t=time). The second is vf-vi=at (vf=final velocity, vi=initial velocity, a=acceleration due to gravity, t=time). So to find the time that the ball traveled, isolate the t-variable from the d=0.5at^2. Isolate the t and the equation now becomes
. Solving the equation where d=8 and a=9.8 makes the time
=1.355 seconds. With the second equation, the vi=0 m/s, the vf is unknown, a=9.8 m/s^2 and t=1.355 sec. Substitute all these values into the equation vf-vi=at, this makes it vf-0=9.8(1.355). This means that the vf=13.28 m/s.
