Question

2. Sally put her mug of coffee on the table. The mug has a mass of 1 kg. if the pressure

Answer 1

We have,

• The mass of sally's mug is 1 kg
• The pressure appliedby the mug is 1100 pascal.

We know that,

• Pressure = Force/Area

As, we already have the value of pressure, let's calculate that of force now;

• F = ma
• F = 1 × 9.8 { Acceleration due to gravity, let's round off it to 10}
• F = 10 N

Just put all the values in the formula now;

• P = F/A
• 1100 = 10 / A
• 1100/10 = A
• 110 m² = A

As, it is already mention that we need to find the radius of the mug, it is obviously a circular base.

We know that,

• Surface area = Circumference

So, let's solve it;

• Circumference = 2πr
• 110 = 2 × 22/7 × r
• 110 × 7/2 × 22 = r
• 5 × 7 = r
• 35 cm = r

Thus, the radius of the circle is 35 cm.