The answer would be false
A ground wire provides a conducting path to the earth which is separate and independent from the path of an electrical appliance. Also, a ground wire is an additional pathway for an electric current to safely return to the ground without imposing danger to anyone in the event that a short circuit might occur. This is particularly important for shock hazard since it forces the breaker to trip by supplying a path to the ground if ever a hot wire comes in contact with a metal case of the appliance.
A fuses and circuit breakers limit the current which can possibly flow in a circuit. The metal filament present in the fuse will melt and break the connection. On the other hand, the circuit breaker with its bimetallic strip's heating effect causes a bending and tripping of a spring-loaded switch.
Answer:
Explanation:
The Coulomb's law states that the magnitude of the electrostatic force between two charges is directly proportional to the product of the magnitudes of charges and inversely proportional to the square of the distance between them:
In this case, we have :
Answer:
- The independent variable its A, the temperature.
Explanation:
There are two variable in this (mental) experiment. The temperature and the gender of the alligator.
The temperature its the independent variable, its the one we can control using the incubator.
The gender of the alligator, its hypothesized, will be determined by the temperature, so, its the dependent variable in our hypothesis.
The incubator will be used in all the eggs of the experiment, so, its not a variable.
The male alligators its one of the possible outcomes of the experiment. Again, not a variable.
ANS: The correct answer to the question is coefficient of friction.
EXPLANATION:
Let us consider a body resting on a table. The weight of the body is acting in vertical downward direction. The table also exerts an equal amount of force perpendicular to the surface of the body which is called normal reaction.
Here, normal reaction [N] = Weight [W]
Let an external force is applied on the body which will cause motion on the body. As the body is resting on the floor, friction will come into existence which will oppose the relative motion between table and body.
Let F is the force of friction.
The force of friction is directly proportional to the normal reaction. Mathematically we may write F ∝ N
Here, is a proportionality constant called the coefficient of friction.
⇒ [∵N= W]
From above, it is obvious that coefficient of friction is a unitless quantity.
Hence, the amount of friction divided by the weight of an object forms a unitless number called the coefficient of friction.