Answer:
a) The flow rate of the air is 0.0104 kg/s
b) The fraction of the temperature is 23.91%
Explanation:
a) Given:
N = Number of PCBs = 8
Q = heat dissipated = 10 W
W = power supplied = -25 W
ΔT = rise temperature = 10°C
The total amount of heat dissipated is equal to:
The expression of conservation of energy is:
Replacing:
b) The amount of heat is equal:
The fraction of the temperature is:
%
Is this a book and most likely because the were cute
Answer:
no it gets it form the sun
Explanation:
Answer: "For a projectile with no air resistance, at the peak of its path, it's velocity is equal to zero"
Explanation:
Suppose that you throw an object up. The initial vertical velocity will be positive, and the acceleration (the gravitational acceleration) will point downwards, meaning that it opposes to the initial direction of the velocity, and that decreases the velocity as the time goes by.
There will be a point where the velocity ( that was positive until now, so until now the height of the object was increasing), is equal to zero, this means that at this moment the object stops moving, and after, because we still have negative acceleration, the velocity will start become negative, and the object will fall down.
Then that point where the velocity was zero is the peak of its path, then we can conclude that:
"For a projectile with no air resistance, at the peak of its path, it's velocity is equal to zero"
Answer:
Work done, W = −287500 Joules
Explanation:
It is given that,
Mass of the car, m = 920 kg
The car is travelling at a speed of, u = 90 km/h = 25 m/s
We need to find the amount of work must be done to stop this car. The final velocity of the car, v = 0
Work done is also defined as the change in kinetic energy of an object i.e.
W = −287500 Joules
Negative sign shows the work done is done is opposite direction.
