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2 years ago

Which of the following is a type of physical change?

Physics

2 answers:

goblinko [34]2 years ago

8 0

Answer is C. All of the others are internal/molecular changes.

Charra [1.4K]2 years ago

7 0

Answer is C

Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds

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Radioactive isotopes can be used to find the age of rocks, fossils, or other artifacts. Carbon-14 has a half-life of 5,730 years

bazaltina [42]

Answer:

1/8 = (1/2)^3

This implies the sample has decayed for 3 half lives

3 * 5730 yrs = 17,200 years

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2 years ago

What are some thermal insulators you can find in a normal house

adoni [48]

Body heat :)

i'm going du.mb here

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3 years ago

What is the mass of an object that weighs 500 newtons on earth?

Eva8 [605]

The mass would be 51 kg. So b is the right answer.

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3 years ago

Helppp!!! what's the answer to this??

riadik2000 [5.3K]

Answer:

(b)

Explanation:

The voltage always lags the current by 90°, regardless of the frequency.

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2 years ago

Determine the angular speed, in rad/s of:

ryzh [129]

Answer:

Explanation:

A. The earth about its axis:

The earth makes one revolution in 24 hours. to know the number of revolutions per second it makes, we need to convert hours to seconds and the revolution to rad.

$\frac{1 rev}{24hours}\times \frac{1 hr}{3600s}\times \frac{2\pi}{1}= 7.27 \times10^-5 rad/s$

B. The minute hand of the clock makes one revolution in 60 minutes

To convert this to rad per second, we have

$\frac{1 rev}{60mins}\times \frac{1 min}{60s}\times \frac{2\pi}{1}= 1.745 \times10^-3rad/s$

C. The hour hand of a clock completes one revolution in 12 hours

$\frac{1 rev}{12hours}\times \frac{1 hr}{3600s}\times \frac{2\pi}{1}= 1.454 \times10^-4 rad/s$

D. an egg beater turning at 300 rpm.

$\frac{300 rev}{1minute}\times \frac{1 min}{60s}\times \frac{2\pi}{1}= 7.27 \times10^-5 rad/s=0.0218rad/s$

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2 years ago