A student shines a mixture of red and blue light onto a blue toy car. What colour will the car appear?
1 answer:
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Answer:
Net force acting on them is 16 N and it is acting to the right side.
Explanation:
It is given that,
Force acting by the dog, (right side)
Force acting by Simone , (backward)
Let backward direction is taken to be negative while right side is taken to be positive.
The net force will act in the direction where the magnitude of force is maximum. Net force is given by :
F = 16 N
So, the net force is 16 N and it is acting to the right side.
The first law of thermodynamics says that the variation of internal energy of a system is given by:
where Q is the heat delivered by the system, while W is the work done on the system.
We must be careful with the signs here. The sign convention generally used is:
Q positive = Q absorbed by the system
Q negative = Q delivered by the system
W positive = W done on the system
W negative = W done by the system
So, in our problem, the heat is negative because it is releaed by the system:
Q=-1275 J
while the work is positive because it is performed by the surrounding on the system:
W=+855 J
So, the variation of internal energy of the system is
where Q is the heat delivered by the system, while W is the work done on the system.
We must be careful with the signs here. The sign convention generally used is:
Q positive = Q absorbed by the system
Q negative = Q delivered by the system
W positive = W done on the system
W negative = W done by the system
So, in our problem, the heat is negative because it is releaed by the system:
Q=-1275 J
while the work is positive because it is performed by the surrounding on the system:
W=+855 J
So, the variation of internal energy of the system is