The record distance in the sport of throwing cowpats is 81.1 m. this record toss was set by steve urner of the united states in 1981. assuming the initial launch angle was 45° and neglecting air resistance, answer the following. (a) determine the initial speed of the projectile. 28.194 correct: your answer is correct. m/s (b) determine the total time the projectile was in flight. 4.068 correct: your answer is correct. s (c) qualitatively, how would the answers change if the launch angle were greater than 45°

(a) 28.19 m/s

The range of a projectile is given by the equation:

where

u is the initial speed

is the angle of projection

is the acceleration of gravity

For the projectile in this problem, we know that:

(range)

So we can re-arrange the equation to find the initial speed:

(b) 4.068 s

The initial vertical velocity of the projectile is

and we know that at the highest point of the trajectory, the vertical velocity becomes zero, so we have

which means that the time needed to reach the maximum height is

The time of flight is actually twice this time, so

And by substituting

u = 28.19 m/s

we find:

(c) If the angle increases, the range decreases and the time of flight increases

We can answer by looking at the two formulas:

Let's start by analyzing the range, d. We see that:

- If the angle increases, the factor decreases (because is the angle of maximum for the sine)

- If the angle decreases, the factor also decreases

Therefore is the angle that gives the maximum range, so any change in this will decrease the range.

Now let's analyze the time of flight, t:

- If the angle increases, the factor increases, so the time of flight increases

- If the angle decreases, the factor decreases, so the time of flight will decrease

where is the photo and the answer choices?

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.