All categories

3 years ago

If a man travels from 0m to 5m then back to -3m, all in four seconds, what is the mans displacement?

Physics

1 answer:

yawa3891 [41]3 years ago

7 0

Answer:

-3 m

Explanation:

Displacement is the final position minus the initial position.

Δx = x − x₀

Δx = -3 m − 0 m

Δx = -3 m

You might be interested in

The graph shows the motion of a car. Which segment shows that the car is slowing down? A, B, C, or D Graph:

shutvik [7]

Answer:

Segment c

Explanation:

5 0

3 years ago

Read 2 more answers

When a rocket is 4 kilometers high, it is moving vertically upward at a speed of 400 kilometers per hour. At that instant, how f

Y_Kistochka [10]

Answer:

The angle of elevation of the rocket is increasing at a rate of 48.780º per second.

Explanation:

Geometrically speaking, the distance between the rocket and the observer ( $r$ ), measured in kilometers, can be represented by a right triangle:

$r = \sqrt{x^{2}+y^{2}}$ (1)

Where:

$x$ - Horizontal distance between the rocket and the observer, measured in kilometers.

$y$ - Vertical distance between the rocket and the observer, measured in kilometers.

The angle of elevation of the rocket ( $\theta$ ), measured in sexagesimal degrees, is defined by the following trigonometric relation:

$\tan \theta = \frac{y}{x}$ (2)

If we know that $x = 5\,km$ , then the expression is:

$\tan \theta = \frac{y}{5}$

And the rate of change of this angle is determined by derivatives:

$\sec^{2}\theta \cdot \dot \theta = \frac{1}{5}\cdot \dot y$

$\frac{\dot \theta}{\cos^{2}\theta} = \frac{\dot y}{5}$

$\frac{\dot \theta\cdot (25+y^{2})}{25} = \frac{\dot y}{5}$

$\dot \theta = \frac{5\cdot \dot y}{25+y^{2}}$

Where:

$\dot \theta$ - Rate of change of the angle of elevation, measured in sexagesimal degrees.

$\dot y$ - Vertical speed of the rocket, measured in kilometers per hour.

If we know that $y = 4\,km$ and $\dot y = 400\,\frac{km}{h}$ , then the rate of change of the angle of elevation is:

$\dot \theta = 48.780\,\frac{\circ}{s}$

The angle of elevation of the rocket is increasing at a rate of 48.780º per second.

3 0

3 years ago

The moon is always circling around the earth, in a stable orbit. This movement is the reason we see the different phases of the

Darina [25.2K]

The answer would be B. This is because all planets in our galaxy orbit the sun.

3 0

3 years ago

If we're interested in knowing the rate at which light energy is received by a unit of area on a particular surface, we're reall

Ad libitum [116K]

Illluminance is the measurement of photo-metric power. That means, illuminance is the rate of photo-metric flux that is received by a surface per area. It is usually expressed as a unit of W/m^2. Thus, from the choices, the answer we're looking for is illuminance.

6 0

3 years ago

Which of the following is a composite of a gas and a solid

cricket20 [7]

<span>{c o {a la manzana o
<span>Vapor de agua en el aire en una ducha de agua caliente</span>
</span>

3 0

3 years ago