Ask question

Ask question

All categories

3 years ago

10

Which practice fits the definition of conservation?

1 answer:

Doss [256]3 years ago

5 0

Answer:

recycling cans that contain a material like aluminum

Explanation:

Conservation of resources is the sustainable use of available resources to ensure their continuous availability.

Resources are limited in the environment and they cannot satisfy all of our wants. Therefore, we need to ration them in the best way possible.

Recycling is one of such ways in which materials are conserved.
In recycling is the process of converting wastes into new materials.
The metals won from the recycling cans can be used again and new aluminium prospects would not have to be mined again.

You might be interested in

Please explain how to solve it!!!

Alexxandr [17]

All you need to do is to convert the velocity to meters per hour. Then multiply by 0.4 hours. I guess the answer was rounded up.

6 0

4 years ago

A 20 g ball of clay traveling east at 4.5 m/s collides with a 45 g ball of clay traveling north at 2.0 m/s. You may want to revi

german

Answer:

The ball travels with a speed of 1.96 m/s in a North East direction

Explanation:

Based on the law of conservation of linear momentum, we have that

$m_{1}v_{1}+m_{2}v_{2}=(m_{1}+m_{2})v$

Since this problem involves motion in both the x and y coordinates, we will solve it in the separate coordinates, and then find the resultant as our answer.

Momentum in the x- direction

in the x direction, $v_{2}= 0$ . this makes $m_{2}v_{2}=0$

hence we have

$20\times4.5=65v_{x}$

$v_{x}=1.385m/s$

Momentum in the y- direction

in the y direction, $v_{1}= 0$ . this makes $m_{1}v_{1}=0$

hence we have

$45\times2.0=65v_{y}$

$v_{y}=1.385m/s$

The resultant of the two vectors can be found using Pythagoras' theorem

$v=\sqrt{1.385^{2}+1.385^{2}} =1.959$

The direction of the resultant vector is found as

$Tan^{-1}(\frac{1.385}{1.385})=45degrees$

Hence the ball moves with a velocity of 1.96m/s in a North East direction

7 0

3 years ago

A(n) _____ represents the U.S. in a foreign country.

tensa zangetsu [6.8K]

Ambassador i believe if not then embassy

4 0

3 years ago

Read 2 more answers

A merry-go-round with a a radius of R = 1.99 m and moment of inertia I = 194 kg-m2 is spinning with an initial angular speed of

Aleksandr [31]

Answer:

Part 1)

$L_1 = 185.2 kg m^2/s^2$

Part 2)

$L_2 = 663.07 kg m^2/s^2$

Part 3)

$L = 663.07 kg m^2/s^2$

Part 4)

$\omega = 1.83 rad/s$

Part 5)

$F_c = 453.6 N$

Explanation:

Part a)

Initial angular momentum of the merry go round is given as

$L_1 = I \omega$

here we know that

$I = 194 kg m^2$

$\omega = 1.47 rad/s^2$

now we have

$L_1 = 194 \times 1.47$

$L_1 = 185.2 kg m^2/s^2$

Part b)

Angular momentum of the person is given as

$L = mvR$

so we have

$m = 68 kg$

$v = 4.9 m/s$

R = 1.99 m

so we have

$L_2 = (68)(4.9)(1.99)$

$L_2 = 663.07 kg m^2/s^2$

Part 3)

Angular momentum of the person is always constant with respect to the axis of disc

so it is given as

$L = 663.07 kg m^2/s^2$

Part 4)

By angular momentum conservation of the system we will have

$L_1 + L_2 = (I_1 + I_2)\omega$

$185.2 + 663.07 = (194 + 68(1.99^2))\omega$

$848.27 = 463.28 \omega$

$\omega = 1.83 rad/s$

Part 5)

Force required to hold the person is centripetal force which act towards the center

so we will have

$F_c = m\omega^2 R$

$F_c = 68(1.83^2)(1.99)$

$F_c = 453.6 N$

3 0

3 years ago

What is the half-life of an isotope if 125 g of a 500 g sample of the isotope remains after 3.0 years?

Troyanec [42]

Answer:

125 / 500 = 1/4 of the sample left after 3.0 yrs

1/2 * 1/2 = 1/4 sample has decayed thru 2 half-lives

2 * HL = 3

1 Half-Life = 1.5 yrs

3 0

2 years ago