Ask question

Ask question

All categories

2 years ago

5

Which statements best describes why science changes?

1 answer:

MrRa [10]2 years ago

7 0

Explanation:

Science changes in so many ways. In my opinion, science changes due to Climatic change.

Hope it helps.

You might be interested in

2. What must be true about two given objects for energy to be transferred as heat between them?

Ksivusya [100]

D the object must have different temperatures

5 0

3 years ago

Read 2 more answers

A lightbulb has an effciency of 8.2%. How much light energy (not heat energy) is generated by the bulb every second if the buld

telo118 [61]

It really depends on what the bulb is being used for, since efficiency means how much of the output is USEFUL.
If the bulb is being used for light in a dark room, then it produces (8.2% x 21W) = 1.72 joules per second of light energy.
If the bulb is being used to keep a hamster cage or a fish tank warm, then the 8.2% is the useful part, and the light is the other (91.8% x 21W) = 19.28 joules per second.

8 0

3 years ago

A 41.0 kg child swings in a swing supported by two chains, each 2.98 m long. (a) If the tension in each chain at the lowest poin

Alex777 [14]

Answer:695.5 N

Explanation:

mass of child $m=41 kg$

Length of chain $L=2.98 m$

Tension in each chain $T=348 N$

(a)Tension at bottom point $T=348 N$

At lowest Point

$T+T-mg=\frac{mv^2}{L}$

$2T-mg=\frac{mv^2}{L}$

$2\times 348-41\times 9.8=\frac{41\times v^2}{2.98}$

$v^2=\frac{294.2\times 2.98}{41}$

$v=\sqrt{21.38}=4.62 m/s$

(b)Force exerted by Seat will be Equal to Normal reaction

$N-mg=\frac{mv^2}{L}$

$N=mg+\frac{mv^2}{L}$

$N=41\times 9.8+\frac{41\times 21.38}{2.98}$

$N=695.95 N$

8 0

3 years ago

What must be applied to move a load?

Misha Larkins [42]

An applied force must be applied to move a load. This applied force must be large enough to overcome any opposing forces in order to move the load.

3 0

4 years ago

Read 2 more answers

Identify the situations that have an unbalanced force. Check all that apply.

pochemuha

the answer is.......................1,4,5

7 0

4 years ago

Read 2 more answers