Which of the following is a befit participating in team sports?

A busy chipmunk runs back and forth along a straight line of acorns that has been set out between its burrow and a nearby tree.

dmitriy555 [2]

Answer:

Chipmunk's average acceleration during the 2.07 s time interval = 0.1256 $m/s^2$

Explanation:

We have equation of motion, v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration and t is the time taken.

In this case we need to find acceleration value, we have initial velocity = 1.47 m/s, final velocity = 1.73 m/s and time taken = 2.07 seconds.

Substituting

1.73 = 1.47 + a * 2.07

a = 0.1256 $m/s^2$

Chipmunk's average acceleration during the 2.07 s time interval = 0.1256 $m/s^2$

7 0

4 years ago

Bromium has two naturally occurring isotopes: 79br, with an atomic weight of 78.918 amu, and 81br, with an atomic weight of 80.9

saul85 [17]

The two different isotopes have weights :

w1 = 78.918 amu

w2 = 80.916 amu

average weight w3 = 79.903 amu

The mixing of two components can be modeled as

let the fraction of w1 be 'x'

hence $w1. x + w2.(1-x) = w3$

now this is a linear equation in 'x'. Substituting the values we get

x = 0.507

hence the percentage of Br79 = 50.7% and the percentage of BR81 = 49.3%

8 0

3 years ago

In the desert air, sound travels at 358 meters per second (m/s). In the polar air, sound travels at 330 meters per

Sati [7]

Answer:

The correct option is;

C. The temperature of the air affects the speed of sound

Explanation:

The information given are;

The speed with which sound travels in the desert air = 358 m/s

The speed with which sound travels in the polar air = 330 m/s

The major difference between the desert air and the polar air is that the temperature of the desert air is hotter than the temperature of the air in the polar region. Therefore the speed of sound is affected by the air temperature.

The equation that gives the relationship of the speed of sound in air, $v_{air}$ , to temperature is presented as follows;

$v_{air} = 331\frac{m}{s} \times \sqrt{\dfrac{T_K}{273 K} } = 331\frac{m}{s} \times \sqrt{1 + \dfrac{T_{^{\circ}C}}{273 ^{\circ} C} }$

Which shows that the speed of sound in air, $v_{air}$ , rises as the temperature of the air rises.

Where;

$T_{^{\circ}C}$ = The temperature of the air in degrees Celsius

$T_K$ = The temperature of the air in degrees Kelvin.

7 0

3 years ago

Which is younger, the rock layers or the fault?

jeka94

<h2>FAULT</h2>

The principle of cross-cutting relationships states that a fault or intrusion is younger than the rocks that it cuts. The fault labeled 'E' cuts through all three sedimentary rock layers (A, B, and C) and also cuts through the intrusion (D). So the fault must be the youngest formation that is seen.

- BRAINLIEST answerer

6 0

3 years ago

Read 2 more answers

Which of the following solar oven design materials would serve as the best insulator to minimize the transfer of thermal energy

love history [14]

Answer:

layers of cotton lining the interior

Explanation:

5 0

3 years ago