Answer:
Electric switch is commonly known as the key of an electric circuit.
Answer:
A symbol and a model are both examples of a representation because they are presented in place of the real thing.
Explanation:
A symbol is a sign, a letter, mark, token, figure, or image used to stand in place of an object, function, or process. For example, co2 is used in Chemistry to represent carbon dioxide. There are many symbols representing other objects or meanings. Mathematically, we can state that "a" equals 40. "a" is a symbol representing the numerical value "40." Similarly, a model is a representation of a structure or a person on a smaller scale. For example, Architects produce models of buildings and other projects that they design.
Explanation:
Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in
Answer:
a) 
b) T = 720.85N
Explanation:
With a balance of energy from the lowest point to its maximum height:
Solving for 
:
Centripetal acceleration is:
To calculate the tension of the rope, we make a sum of forces:
Solving for T:
T = 720.85N
Answer:
0.52378
Explanation:
V = Velocity = 50 m/s
r = Radius = 1.25 m
I = Moment of inertia = 110 kgm²
N = Weight supported by wheels = 14000 N
The angular velocity
Frictional force is given by
The coefficient of friction is given by
The coefficient of friction is 0.52378
