The average force acting on an object multiplied by the time the force acts is defined as the impulse. Is $I=F / t$ a correct way of expressing this definition if $I$ represents impulse, $F$ represents average force, and $t$ represents time? Explain.

When a cannonball is fired from a cannon, the momentum of the recoiling cannon is momentarily?

A 4-kg fish is swimming at $1.5 \mathrm{~m} / \mathrm{s}$ to the right. He swallows a $1.2-\mathrm{kg}$ fish swimming toward him at $3 \mathrm{~m} / \mathrm{s}$. Neglecting water resistance, what is the velocity of the larger fish immediately after his lunch?

A $5-\mathrm{kg}$ fish swimming at $1 \mathrm{~m} / \mathrm{s}$ swallows an absentminded 1-kg fish swimming toward it at a speed that brings both fish to a halt immediately after lunch. Show that the speed of the approaching smaller fish before lunch must have been $5 \mathrm{~m} / \mathrm{s}$.

A 5-kg fish swimming 1 m/s swallows an absent- minded 1-kg fish swimming toward it at a velocity that brings both fish to a halt immediately after lunch. Show that the speed of the smaller fish before lunch was 5 m/s.

Based upon the descriptions provided in table 1.2, which subfields of physics are involved in explaining why an ice cube melts? Which subfields are involved in explaining how an airplane flies? Explain.

Based upon the brief descriptions provided in table / which subfield of physics would you say is involved in the explanation of rainbows? Which subfield is involved in describing how an acorn falls? Explain

Which subfield of physics would you say is involved in the explanation of rainbows based on the brief descriptions provided in the given table? Which subfield is involved in describing the fall of an acorn? Explain.

Summarize the evidence indicating that over several hundreds of years or more there have been variations in the level of the solar activity.

The claims of Dalton's atomic theory have been revised over the past 200 years. Which claim or claims do you think have been proven incorrect based on new evidence?

Over the years, there have been several credible claims by experienced observers of sightings of Unidentified Flying Objects (UFOs). Despite this, scientists have shied away from taking up serious study of UFOs, although there are ongoing searches for signals from extraterrestrial intelligent beings. Can you think of reasons why scientists have not taken UFOs seriously? What problems can you see in trying to study UFOs?

Over the years, there have been several credible claims by experienced observers of sightings of Unidentified Flying Objects (UFOs). Despite this, scientists have shied away from taking up serious study of UFOs, although there are ongoing searches for signals from extraterrestrial intelligent beings. Can you think of reasons why scientists have not taken UFOs seriously? What problems can you see in trying to study UFOs.

On a piece of graph paper, draw arrows representing the following vectors. Make sure the tip and tail of each arrow you draw are clearly distinguishable. Placing the tail of the vector at $\langle- 5,8,0\rangle,$ draw an arrow representing the vector $-\vec{p} .$ Label it $-\vec{p}$.

Draw the following vectors on a piece of paper and show the scale you use: a. 20 m/s west b. 3 miles north c. 4 N southeast