Answer: R=24.2Ω
Explanation: <u>Power</u> is rate of work being done in an electric circuit. It relates to voltage, current and resistance through the following formulas:
P=V.i
P=R.i²
![P=\frac{V^{2}}{R}](https://tex.z-dn.net/?f=P%3D%5Cfrac%7BV%5E%7B2%7D%7D%7BR%7D)
The resistance of the system is:
![P=\frac{V^{2}}{R}](https://tex.z-dn.net/?f=P%3D%5Cfrac%7BV%5E%7B2%7D%7D%7BR%7D)
![R=\frac{V^{2}}{P}](https://tex.z-dn.net/?f=R%3D%5Cfrac%7BV%5E%7B2%7D%7D%7BP%7D)
![R=\frac{110^{2}}{500}](https://tex.z-dn.net/?f=R%3D%5Cfrac%7B110%5E%7B2%7D%7D%7B500%7D)
R = 24.2Ω
<u>For the device, resistance is 24.2Ω.</u>
The chemical energy of petrol is converted to heat energy on combustion. The heat energy is converted to kinetic energy by the use of internal combustion engines in vehicles. The law of conservation of energy is maintained in each process.
<h3>What is kinetic energy?</h3>
The kinetic energy of an object is associated with its motion. It can be related to the mass and velocity as
K.E = 1/2 mv²
Given is a diagram of energy conversion due to combustion.
The chemical energy of petrol is converted to heat energy on combustion. The heat energy is converted to kinetic energy by the use of internal combustion engines in vehicles.
The law of conservation of energy states that the energy can neither be created nor destroyed. It can be only converted to one form to the other.
In the given process, the mass decreases but energy remains the same in all forms of energy.
Hence, the law of conservation of energy is maintained in each process
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Average speed = (distance covered) / (time to cover the distance)
Average speed = (60 kilometers) / (4 hours)
Average speed = (60/4) kilometer/hour
<em>Average speed = 15 km/hr</em>
Answer:
Upward: Negative
Downward: Positve
Explanation:
Let upward be positive
We want to find the work done on the object upwards.
The equation of work done due to gravity is
![f _{g}d \cos( \alpha )](https://tex.z-dn.net/?f=f%20_%7Bg%7Dd%20%5Ccos%28%20%5Calpha%20%29%20)
It is read as force of gravity times displacement times cos of the angle between the force and displacement.
Since gravity is happening down of the center of mass and the displacement is upwards, the angle is 180° so
![f_{g}d \cos(180)](https://tex.z-dn.net/?f=f_%7Bg%7Dd%20%5Ccos%28180%29%20)
Cosine of 180 is -1
so
![- f_{g}d](https://tex.z-dn.net/?f=%20%20-%20%20f_%7Bg%7Dd%20)
If we go downwards, the sign will be positive because cos(0)=1
A capacitor is connected to an ac supply. increasing the frequency of the supply increases the current through the capacitor
A capacitor is a device for storing electrical energy that consists of two insulated conductors in close proximity. The parallel-plate capacitor is a simple example of such a storage device.
A capacitor (also known as a condenser) is a two-terminal passive electrical component that stores energy electrostatically in an electric field. Practical capacitors come in a variety of shapes and sizes, but they all have at least two electrical conductors (plates) separated by a dielectric (i.e., insulator).
Capacitors exist in various shapes and sizes, and their value is measured in farads (F). Capacitors are utilized in both alternating current and direct current systems.
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