Which action can be explained by physics ?
2 answers:
Answer:
Option (d)
Explanation:
The pressure of blood exerted on the inner walls of the veins.
Pressure is defined a the force acting on the surface per unit area.
The SI unit of pressure is Newton per square metre.
More be the force more be the pressure.
As due to the deposition of cholesterol on the walls of veins, the area of cross section of walls decreases which results the increase in pressure . It is very harmful for the heart, it may cause heart failure as heart do extra work to pump the blood.
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A skydiver free falls under gravity but her rate of fall slows down due to drag -air resistance. when this air resistance becomes equal to her weight, the two get balanced and the body does not accelerate or decelerates.
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3. Answer: The tendency of an object's motion to remain the same.
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4. Answer: 254 N
The man pushes the box with 310 N force at an angle of 55 degrees to the horizontal.
we can write this in terms of horizontal ()and vertical component (
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Horizontal component:
Vertical component:
The vertical component would act towards the floor making the job more difficult to move the job.
