What is the minimum coeffecient of static friction μmin required between the ladder and the ground so that the ladder does not slip? express μmin in terms of m1

Assume similar data for the motion of the blood in your aorta. estimate how many beats of the heart it will take the blood to get from your heart to your brain. (assume that the distance from your heart to your brain is 30 cm)

Can you match these to the correct definition

Am i correct on these two physics questions?