Answer:
This is because normal force is exerted perpendicularly to the point of contact between the upper and lower objects.
Explanation:
This is because the upper object is still subject to gravitational pull. Therefore, the amount of force it exerts on the lower object due to gravity will be equal to the normal force that acts in the negative direction of gravitational force. Additionally, normal force is evident because the upper object will not go into the lower object.
Answer:
740, mm of Hg
Explanation:
The pressure of argon , in mm of Hg = difference in the level of mercury on either side of the manometer.
mercury column in the open end of the manometer is 22 mm below that in the side connected to the argon and 762 mmHg, end is open to atmospheric pressure.
therefore, The pressure of argon , in mm of Hg =762 -22 = 740, mm of Hg
Answer:

Explanation:
From the attached diagram below:
AC = a (1 + e) = R₂ -------- equation (1)
CD = a ( 1 - e) = R₁ --------- equation (2)
⇒ 1 - e = 

Replacing the value for e into equation (1)



From Kepler's third law;



Answer:
1 mole of every substance has 6.022 × 10^23 particles. This is called Avagadro's constant
400 N
The weight of the man is evenly distributed on each scale