Ask question

Ask question

All categories

3 years ago

7

A player kick the soccer ball from ground level and send it flying at an angle of 30° at a speed of 26M/S. What is the maximum h

eight attained by the ball?

1 answer:

icang [17]3 years ago

7 0

The answer would be 2.63. Your welcome. This has been changed to the correct answer.

You might be interested in

How is it possible for a person watching a baseball game on TV to hear sounds before someone who is actually watching the same g

Andreyy89

Answer:

It is possible because, the TV broadcast audio and video signals in radio frequency which travels at the speed of light while the audio signals travel to those present in the stadium at the speed of sound which is over eight hundred thousand times slower than the speed of light

Explanation:

It is possible because of the following;

1. TV signals from the camera (including the captured sound) very close to the field of play are transmitted through the radio frequency bands and as such are a form of electromagnetic radiation that travels at the speed of light which is about 300,000 km/second

It will therefore, take 1 second for a sound of the game to reach someone located at 300,000,000 meters watching a live televised game

2. The speed of sound is about 343 m/second and it therefore takes up to 2 seconds for a sound to reach someone 686 meters away from the ball in the stadium.

5 0

3 years ago

3) A bird flies toward a tree limb at a 45-degree angle to the ground along a path that is 50 m long landing on the limb. Determ

marin [14]

Answer:

35 m

Explanation:

Given :

The distance of the path from the ground to the tree limb = 50 m

The angle between the path of flight of the bird towards the tree limb and the ground = 45 degrees

Therefore we can determine the height above which the bird perched above the ground by using the rules of the trigonometric ratios as;

We know that ,

$\sin 45^\circ =\frac{\text{perpendicular}}{\text{hypothenus}}$

$\sin 45^\circ =\frac{\text{BC}}{\text{AC}}$

$0.7 =\frac{\text{BC}}{\text{50}}$

$\text{BC }= 0.7 \times 50$

= 35

Therefore, the bird perched on the tree limb at a height of 35 m.

6 0

2 years ago

How far away is the sun from earth in AU?

julia-pushkina [17]

That distance is the definition of 1 AU.

5 0

3 years ago

SECTION I - Terms of Reference

myrzilka [38]

The answers would be:

A. Frame of reference

E. Relative Motion

H. Speed

D. Vector

B. Distance

J. Velocity

I. Average speed

G. Displacement

C. Instantaneous Speed

F. Acceleration

Here is more about each in general:

<u>Frame of reference </u>is a point or location where you are doing measurements from that is not accelerating or let's say the measurement of distance and velocity of objects from your point of view.

Let's say you and a friend are sitting in a bus that is moving at 5/s. If you look at your friend, you would say that your friend is not moving or has a velocity of 0 m/s, but when you look outside, you'll see trees moving past you at the speed your bus is moving, which is 5 m/s.

<u>Relative motion</u> is best explained with an example

Let's say you are on a boat and your friend is standing on the pier. You are both facing the same direction and you are not both not moving. If you threw a rock in the water, you would be both seeing the same thing. The rock would move relative to both of your positions. But let's say the boat you are on starts to move and you hold onto the rock.

The rock relative to you is not moving, but the rock relative to your friend is moving the same speed as the boat.

The slope in a distance-time graph is the <u>speed. </u>When you look at a graph, the slope shows the change of y over the change of x. So in a distance-time graph, the distance is in the y-axis while the time is on the x axis.

<u>Speed</u> is defined by the change in distance over time.

Slope =<u> (y2 - y1)</u> Speed = <u>distance</u>

(x2 - x1) time

<u>Vector </u>is a quantity that describes both magnitude and direction. Displacement is an example of a vector quantity such as:

30m North 30m = magnitude North = direction

This differs from <u>distance, </u>which is a scalar quantity. It shows how far one traveled from start to end, regardless of the direction.

For example a man walks to his house from work. He walks 5m straight, takes a left and walks another 2m and walks 6m more. If you will calculate the distance he traveled, just add up the different lengths.

5m + 2m + 6m = 13m

But if you were to get the <u>displacement, </u>you would draw a direct line from the starting point and the end point. So in other words, displacement is the distance between the starting point and the end point, with direction.

<u>Velocity </u>is a vector quantity because it not only shows the distance traveled over a unit of time, it also shows direction. For example, a car is moving 5 m/s towards the East.

5 m/s = magnitude Towards the East= direction

This differs from speed because speed merely says how fast an object is moving, but it will not tell you what direction it is moving.

<u>Average speed</u> is computed by the formula:

v = distance/time traveling

So all you need to do is get the length traveled and divided by how long it took to travel that path. Again, average speed is a scalar, it does not say anything about the direction.

<u>Instantaneous velocity </u>is the change in motion at a specific point in time. For example, you have a car that is already moving and it covered a distance of 2m in 1s at one point. You want to find out the instantaneous velocity at that point. So how do you get it, just divide the distance by time:

2m/1s = 2m/s

The car was traveling at 2m/s at that moment.

<u>Acceleration</u> is the rate of change in velocity. It is computed with the formula:

$a =\frac{ \triangle velocity}{\triangle time}$

$a =\frac{Vf-Vi}{\triangle time}$

So it is the change in velocity over the time it took for the change of velocity to occur.

For example, you have a car that was moving at a velocity of 2 m/s east and increased velocity to 6 m/s over 2 seconds.

So to solve it:

$a =\frac{Vf-Vi}{\triangle time}$

$a =\frac{6m/s-2m/s}{2s}$

$a =\frac{4m/s}{2s}$

$a =2m/s^{2}$

8 0

3 years ago

A hiker walked a hiking trail according to the chart below. What is a possible explanation of the hiker's movement?

AnnZ [28]

A.The hiker had an easy, level trail from 11:00-12:00 and was able to travel the fastest during that time period.---> may be because this was indeed fastest stage

b.The hiker got tired and walked the slowest from 1:00-2:00.---> no, because this was not the slowest stage

c.The hiker stopped for lunch from 11:00-12:00 and that slowed him down.---> no because this was the fastest stage

d.The hiker ended up in the same place that he started.---> no, because the hiker walked more toward east than toward west and more toward south than toward north.

Answer: option a)

6 0

3 years ago

Read 2 more answers