Answer:
a).![Q_{h}=1.5x10^5J](https://tex.z-dn.net/?f=Q_%7Bh%7D%3D1.5x10%5E5J)
b).![Q_{c}=13.2x10^3J](https://tex.z-dn.net/?f=Q_%7Bc%7D%3D13.2x10%5E3J)
Explanation:
a).
Using the law of thermodynamic and using to isovolumetric
ΔU=Qh
![Q_{h}=\frac{W_{net}}{Efficiency}](https://tex.z-dn.net/?f=Q_%7Bh%7D%3D%5Cfrac%7BW_%7Bnet%7D%7D%7BEfficiency%7D)
So to determine the internal energy knowing the work it do
![Q_{h}=\frac{1.5x10^4J}{0.10}=1.5x10^5J](https://tex.z-dn.net/?f=Q_%7Bh%7D%3D%5Cfrac%7B1.5x10%5E4J%7D%7B0.10%7D%3D1.5x10%5E5J)
b).
Efficiency is the work done in relation of the work apply in this case to produce heat so:
![E=\frac{Q_{h}-Q_{c}}{Q_{h}}](https://tex.z-dn.net/?f=E%3D%5Cfrac%7BQ_%7Bh%7D-Q_%7Bc%7D%7D%7BQ_%7Bh%7D%7D)
Solve to Qc
![Q_{c}=Q_{h}*[1-E]](https://tex.z-dn.net/?f=Q_%7Bc%7D%3DQ_%7Bh%7D%2A%5B1-E%5D)
![Q_{c}=1.5x10^4J*(1-0.10)](https://tex.z-dn.net/?f=Q_%7Bc%7D%3D1.5x10%5E4J%2A%281-0.10%29)
![Q_{c}=13.2x10^3J](https://tex.z-dn.net/?f=Q_%7Bc%7D%3D13.2x10%5E3J)
Answer:
increases.
Explanation:
As a ball falls freely towards the ground, it's kinetic energy increases. If the kinetic energy increases, that means the object hasn't hit the bottom yet. If the ball continues to fall freely towards the ground, the air gives it more pressure, after that the pressure begins to increase.
Answer:
A. Time, t = 4.35s
B. Height of its fall, S = 92.72m
Explanation:
Vo = 0 m/s
Vi = 0.46h m/s
S = h m
a = 9.81 m/s2
To calculate the time taken, we need to get the value of the distance, h.
Using the equations of motion,
Vi^2 = Vo^2 + 2aS
Where Vi = final velocity
Vo = initial velocity
a = acceleration due to gravity
S = height of its fall
(0.46h)^2 = 0 + 2*9.81*h
0.2116h^2 = 19.62h
h = 19.62/0.1648
= 92.722 m
To calculate the time,
S = Vo*t +(1/2)*a*t^2
92.772 = 0 + (1/2)*9.81*t^2
t^2 = 185.44/9.81
= 18.904
t = sqrt(18.904)
= 4.348 s
Answer:
Pascal's law says that pressure applied to an enclosed fluid will be transmitted without a change in magnitude to every point of the fluid and to the walls of the container. The pressure at any point in the fluid is equal in all directions
Power consumed = P = 78.0 W
Time taken = t = 10 minutes
Energy consumed = E = ?
The power, energy and time are related by the following equation:
P = E / t
Using the values, we get
78 = E/t
So,
E = 780
This means, 780 Joules of energy was used during the 10 minutes