Amotorcycle that is slowing down uniformly. the motorcycle covers 1 =1000 m in 80 sec⁡. the motorcycle then covers the next 1 =1000 m in 120 sec⁡. calculate (a) the acceleration of the motorcycle and (b) its velocity at the beginning and end of the 2 km trip.

Part a)

acceleration = -0.042 m/s/s

Part b)

initial speed = 14.17 m/s

final speed = 5.77 m/s

Explanation:

Part a)

Let the initial velocity of the motorcycle is

now at the end of 80 s let the speed is

after another 120 s let the speed will be

now we know that

also we know that

also we have

now we can say

also we know

Part b)

now we have

so the starting velocity of the trip is

now speed after t = 200 s is given as

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

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