Answer:
(A) 9.5 m/s
(B) 5.225 m
Explanation:
vertical height (h) = 4.7 m
horizontal distance (d) = 9.3 m
acceleration due to gravity (g) = 9.8 m/s^{2}
initial speed of the fish (u) = 0 m/s
(A) what is the pelicans initial speed ?
- lets first calculate the time it took the fish to fall
s = ut +
since u = 0
s =
t =
where a = acceleration due to gravity and s = vertical height
t = = 0.98 s
- pelicans initial speed = speed of the fish
speed of the fish = distance / time = 9.3 / 0.98 = 9.5 m/s
initial speed of the pelican = 9.5 m/s
(B) If the pelican was traveling at the same speed but was only 1.5 m above the water, how far would the fish travel horizontally before hitting the water below?
vertical height = 1.5 m
pelican's speed = 9.5 m/s
- lets also calculate the time it will take the fish to fall
s = ut +
since u = 0
s =
t =
where a = acceleration due to gravity and s = vertical height
t = = 0.55 s
distance traveled by the fish = speed x time = 9.5 x 0.55 = 5.225 m
Answer:
Explanation:
Given that
Diameter of laser beam d= 2.4 mm
Radius of laser beam r= 1.2 mm
Power P =1.7 W
We know that intensity(I) of laser beam given as follows
Now by putting the values
So
So the intensity at 1.76 m away from laser
The correct equation for the acceleration is a = (v-u)t. Option D is correct.
<h3 /><h3>What is the first equation of motion?</h3>
The acceleration can be defined as the ratio of change in velocity to time. As given in the question,
The final velocity,
Where,
v - final velocity
u - initial velocity
a - acceleration
t - time
First, bring u with v,
Now bring the t with v-u,
So,
Therefore, the correct equation for the acceleration is a = (v-u)t.
Learn more about the first equation of motion:
brainly.com/question/13066230
Answer:
The mile
Explanation:
this is calculated using the metric system in kilometers..