Negative - when the motorcycle displacement has a component in the opposite direction of the given force, that force is doing negative work on the motorcycle.
Answer:
In a series circuit, the same amount of current flows through all the components placed in it. On the other hand, in parallel circuits, the components are placed in parallel with each other due to which the circuit splits the current flow.
Answer:
Your answer should be B.
If your internal energy or <em><u>heat</u></em> of a system <em><u>decreases</u></em> then you know that you are taking that energy out and doing <em><u>work.</u></em>
Answer:
The value is 
Explanation:
From the question we are told that
The speed of the airplane from the north is 
The negative sign is because the direction is towards the south
The speed of the airplane from the east is 
The negative sign is because the direction is towards the west
The distance of the southbound plane from the airport is 
The distance of the westbound plane is 
Generally the distance between the plane is mathematically represented using Pythagoras theorem as

Next differentiate implicitly this equation to obtain the rate at which the distance between the planes changes
So

Here

=> 
=> 
=> 

=> 
=> 
Answer:
2000J
Explanation:
work done = force * distance
Work done = 100 * 20
Work done = 2000J