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4 years ago

An example of a single displacement reaction is

1 answer:

4 0

Single replacement would be represented by a single element being replaced.

This is shown in answer choice B
Where the positions of A and B are swapped

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A student walks 144 m west, and then turns around and walks 89 m east If this takes place in a 7.5-minute interval, what is the

Darina [25.2K]

The average speed is 0.517 m/s

The average velocity is 0.12 m/s west

Explanation:

When dividing the total distance covered by object by time, we get the value for average speed.

$\text { speed }=\frac{\text {distance}}{\text {time}}$

Calculate the distance without consideration of motion’s direction. So, the distance walks 144 m first, and then another 89 m, so the total distance covered is

d = 144 + 89 = 233 meters

Given t = 7.5 minutes. Convert minute into seconds,

$7.5 \times 60=450 \text { seconds }$

So, the average speed can be calculates as below,

$\text { speed }=\frac{233}{450}=0.517 \mathrm{m} / \mathrm{s}$

When dividing the object’s displacement by time taken, we can calculate average velocity.

$\text {velocity}=\frac{\text {displacement}}{\text {time}}$

In given case, the students walks 144 m west first, and then 89 m east. The displacement is the distance in a straight line between the initial and final position: therefore, in this case, the displacement is

d = 144 (west) - 89 (east) = 55 m (west)

The time taken is t = 450 s

So, the average velocity is

$\text {velocity}=\frac{55}{450}=0.12 \mathrm{m} / \mathrm{s}$

And the direction is west (the same as the displacement).

8 0

4 years ago

60 POINTS SO PLEASE HELP ME To add vectors in a straight line ______________ and ______________ are considered positive directio

tankabanditka [31]

Answer:

The answer to your question is

Explanation:

To add vectors in a straight line _right_________ and ___upwards_______ are considered positive directions. __left________ and __downwards____________ are considered negative directions.

I hope it helps you

7 0

3 years ago

Two bar magnets are hung from metal rods and held in the position shown below.

fiasKO [112]

The correct diagram is C.

In fact, the magnetic force works as the electrostatic force: like poles repel each other, while opposite poles attract each other. In this example, we have two magnets one next to each other, and we see that the north pole of one magnet is close to the south pole of the other: therefore, the two poles attract each other, so the two magnets will move closer, as in diagram C.

5 0

4 years ago

Read 2 more answers

Given the acceleration, initial velocity, and initial position of a ball thrown vertically upward, how long does it take for it

kolbaska11 [484]

Answer:

$t = \frac{v_{o} }{g}$

ymax= y₀ + v₀²/2g

Explanation:

The equations of uniformly accelerated rectilinear motion of upward (vertical) for the y axis are :

vfy = v₀y-gt Formula (1)

vfy² = v₀y²-2gΔy Formula (2)

Where:

t: time in any position (s)

Δy= y-y₀

y = vertical position in any time (m)

y₀ : initial vertical position in meters (m)

v₀y: initial vertical velocity in m/s

vfy: final vertical velocity in m/s

g: acceleration due to gravity in m/s²

Data

v₀y = v₀ : total initial speed of the ball

y₀ : initial vertical position of the ball

g :acceleration due to gravity

Time (t) calculation for the ball to reach maximum height

We apply the formula (1)

vfy = v₀y-gt

When the ball reaches its maximum height (h), vy = 0:

0= v₀-gt

v₀ = gt

$t = \frac{v_{o} }{g}$

Calculation of the maximum hight that reaches the ball

When the ball reaches its maximum height (ymax), vy = 0:

We apply the formula (2)

vfy²= v₀y²-2gΔy

0= v₀²-2gΔy

2gΔy = v₀²

Δy= v₀²/2g ,Δy= ymax-y₀

ymax-y₀ = v₀²/2g

ymax= y₀ + v₀²/2g

3 0

3 years ago

Please help!!! The radius of a circle is 5.5 cm, the circumference in meters is 34.56, the area in square meters is 95.03. What

olga nikolaevna [1]

Answer:

47.515 cm²

In meter square= 4.7515 *10^-3 m²

Explanation:

The radius of a circle = 5.5 cm

In meter= 5.5*0.01

= 0.055 m

the circumference= 34.56 cm

in meters = 34.56 cm*0.01

= 0.3456 meters

the area= 95.03 cm²

in square meters =95.03*(0.01)²

in square meters= 9.503*10^-3 m²

. area under the curve at the right

= Area of semi circle

= Area of circle/2

= 95.03 /2

= 47.515 cm²

In meter square= 4.7515 *10^-3 m²

8 0

3 years ago