GGR100H1 Lecture : lecture notes 4

The P wave of the electrocardiogram is a signal from

A) the SA node.

B) depolarization of the AV node.

C) depolarization of the atria.

D) repolarization of the atria.

E) depolarization of the ventricles

A hyperbolic earth departure trajectory has a perigee altitude of300km and a perigee speed of 15km/s
a) calculate the hyperbolic excess speed
b) find the radius when the true anomaly is 100 degrees
c) find Vr and Vperpendicular when the true anomaly is 100 degrees

a 30g bullet is fired into a wall with a speed of 500 m/s
a)if deceleration penetrates,12 cm into the wall calculateforce
b)constant deceleration, 12cm into the wall find time to stop
c) how much work is done in the block and on the bullet whilestopping