The mass of the aeroplane is 300,000 kg.
<h3>What is Newton's second law of motion?</h3>
It states that the force F is directly proportional to the acceleration a of the body and its mass.
The law is represented as
F =ma
where acceleration a = velocity change v / time interval t
Given is the aeroplane lands at a speed of 80 m/s. After landing, the aeroplane takes 28 s to decelerate to a speed of 10 m/s. The mean resultant force on the aeroplane as it decelerates is 750 000 N.
The force expression will be
F = mv/t
Substitute the values and we have
750000 = m x (80 -10)/ 28
750,000 = m x 2.5
m = 300,000 kg
Thus, the mass of the aeroplane is 300,000 kg.
Learn more about Newton's second law of motion.
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Answer:
C. parabolic Curve
Explanation:
The trajectory of a projectile motion is parabolic.
If a ball is thrown at angle of 45° to the horizontal then it will follow a parabolic curve during its motion as its a projectile motion. The other options are incorrect as sine curve is a periodic type of curve. linear curve and tangential curve are also out of place.So option C is correct
Answer:
The pressure difference between two pipe is 
Pa
Explanation:
Density 
Speed in one pipe 
Speed in second pipe 
According to the bernoulli equation,
The pressure difference is given by,
![P_{2} - P_{1} = \frac{1}{2} \times 1165 \times[ (4.53)^{2}- (1.77)^{2}]](https://tex.z-dn.net/?f=P_%7B2%7D%20-%20P_%7B1%7D%20%3D%20%5Cfrac%7B1%7D%7B2%7D%20%5Ctimes%201165%20%5Ctimes%5B%20%284.53%29%5E%7B2%7D-%20%281.77%29%5E%7B2%7D%5D)
Pa
Therefore, the pressure difference between two pipe is Pa
