This pod will deal with cannons that fire a shot
that lands on exactly the same level.
The problems bring together the concepts of the popup and horizontal
launch problems,
and they are among the most classic physics problems!
Review of vector components
Please answer all questions to 3 significant figures of accuracy.
Basic cannon Problem

A cannon is aimed at an angle of 30 degrees.
It fires a cannonball with a speed of 20 m/s.
The cannonball rises and falls and then
lands at precisely the vertical level it was fired at.

First, break the initial velocity
of the cannonball into horizontal and
vertical components using
this method.

Similarly to a horizontal launch problem,
we will break the motion into two components.
In the horizontal dimension, the object moves at a constant speed forward.
In the vertical dimension, the object is initially moving upward
and then falls downward to the same point, similarly to a
popup problem.
Fill out the table below, which describes the quantities involved in this problem:

Determine the total time that the cannonball is in the air.

Determine the range of the cannonball, that is, the horizontal displacement
of the cannonball before it strikes the ground.

We will repeat a similar question with different values.
A cannon is aimed at an angle of 20 degrees.
It fires a cannonball with a speed of 15 m/s.
The cannonball falls to the same vertical position from where it was fired.

Break the initial velocity of the cannon
into horizontal and vertical components.

Fill out the table below, which describes the quantities involved.

Determine the total time that the cannonball is in the air.

Determine the horizontal range of the cannonball.

A cannon is aimed at an angle of 85 degrees.
It fires a cannonball with a speed of 40 m/s.
The cannonball falls to the same vertical position from where it was fired.

Break the initial velocity of the cannon
into horizontal and vertical components.

Fill out the table below, which describes the quantities involved.

Determine the total time that the cannonball is in the air.

Determine the horizontal range of the cannonball.
Use \( g = 9.81 \frac{\text{m}}{\text{s}^2} \)Answer the following questions to three significant figures of accuracy.

A cannon is at an angle of 45.0 degrees above the horizontal
and fires a shot with an initial velocity of 20.0 m/s.
If the cannonball lands on the same level it was fired at,
determine the horizontal range of the cannonball.

A cannon is at an angle of 35.0 degrees above the horizontal
and fires a shot with an initial velocity of 28.0 m/s.
If the cannonball lands on the same level it was fired at,
determine the horizontal range of the cannonball.

A cannon is at an angle of 65.0 degrees above the horizontal
and fires a shot with an initial velocity of 10.0 m/s.
If the cannonball lands on the same level it was fired at,
determine the horizontal range of the cannonball.
Answers: