An advertisement for a certain portable vacuum cleaner shows off its power with a photograph of the vacuum-cleaner wand suspendi
ng a bowling ball by the strength of its suction. The vacuum cleaner can maintain a moderate vacuum inside the apparatus at an absolute pressure of 3.53×104 Pa (against an outside atmospheric pressure of 1.01×105 Pa) when the intake wand is closed. The wand is a hollow metal cylinder with an inside diameter of 3.19 cm. What is the weight of the heaviest ball the vacuum cleaner can lift?
For this exercise let's use Newton's law and equilibrium
F₁ - F₂ - W = 0
Where the force F₁ is the external force applied by the air, the force F₂ is the internal force by the pressure in the vacuum and W is the weight of the ball
Answer: The car would move to the right with 150 n of force. the 150 n of force from friction and air resistance slows the car from moving to the right with 300 n of force.
The gravitational pull will reduce, because the moon is moving further away from the centre of the earth. In other words, the further an object is from the centre of the earth, the weaker the gravitational pull that will be exerted on it.
