Final revision center of mass

What is the centre of mass ?

• it is a single point at which the object can balance.
• The mass is distributed equally around it.
• the centre of gravity of the object
• All of the above

the picture is shown a wooden red rod. Where is the location of center of mass of this rod?

• (9,5)

• (10,5)

• (9,0)

• (10,0)

where is the center of mass of the blue rectangle?

• (9,15)

• (7, 12.5)

• (5,10)

• (10,10)

define the location of center of mass for this cylinder?

• (3,10)

• (12.5,4)

• (4,12.5)

• (2,7.5)

define the location of the center of mass for the green circle?

• (15,6)

• 5,5)

• (5,12.5)

• (6,15)

where is the location of the center of mass for this ball?

• (6,10)

• (8,15)

• (7,12.5)

• (15,8)

A system of two objects the masses are m1=4.5kg, m2=1.5kg  and the position of their center of mass of the system is rc=(6,3) . If the position of the center of mass for the first object is r1=(4,2). What is the position of the center of mass for the second object r2?

• (5,5)

• (0,0)

• (-4,6)

• (4,6)

where is the location of center of mass for this combination of two masses connected with rod?

• (11,5)

• (10,5)

• (9,5)

• 11,0)

The adjacent hoop has a diameter of 1 meter, what are the coordinates of its centre of mass

• 1,1
• 0.5,1
• 0.5,0.5
• 1,0.5

where is the centre of mass of this image

• at 20 mark
• at 42.5 mark
• at 50 mark
• at 100 mark