Tricky Spool Riddle SOLUTION - ft Anne Wojcicki

The video is the final installment in a series answering physics riddles. It begins with a recap of a previous riddle involving a spool and rope, exploring the physics of torque and friction. The video then transitions to a discussion about chromosomes, specifically focusing on the number of chromosomes in mules, which are hybrids of horses and donkeys. The video concludes with a light-hearted appreciation for the learning experience.

What is the initial setup of the physics riddle involving the spool?

• The spool is placed on a slope.

• The rope is coming from underneath the spool.

• The spool is suspended in the air.

• The rope is tied to a wall.

What force tends to make the spool rotate clockwise?

• Friction force

• Magnetic force

• Gravitational force

• Applied force

What role does friction play in the movement of the spool?

• It has no effect on the spool.

• It makes the spool rotate clockwise.

• It prevents the spool from slipping.

• It accelerates the spool.

How does pulling the spool at an angle affect its movement?

• It makes the spool move faster.

• It changes the direction of the spool's movement.

• It has no effect on the spool.

• It stops the spool from moving.

What is the chromosome number of a horse?

• 62

• 64

• 46

• 23

How many chromosomes does a donkey have?

• 23

• 46

• 62

• 64

What is the chromosome number of a mule?

• 62

• 46

• 63

• 64