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kkurt [141]
4 years ago
7

 Will mark as Brainliest!! If possible, Please check these!!! Quiz and I need to pass!!! If you see anything wrong from my answe

rs, please let me know!! Give points for it!!!
5.09 Quiz: How Heat Moves

Question One: What are the ways that heat moves?

A) Heat only moves through conduction and radiation.

B) Heat moves through conduction, convection, and radiation.

C) Heat only moves through air currents.

D) Heat moves from a cold object to a warm object.

Answer I chose was B.

Question two: Convection requires______to transfer heat.

A) solids

B) fluids (liquids or gases)

C) insulation

D) the vacuum of space

Answer I chose was C.

Question three: What does an insulator do?

A) An insulator emits elctromagnetic radiation.

B) An insulator slows heat transfer.

C) An insulator cools a substance.

D) An insulator warms a substance.

Answer I chose was B.

Please check and/or answer!!

~Karleif Westsson
Physics
2 answers:
jarptica [38.1K]4 years ago
5 0
I think everything looks good but 2 might not be right, it might be B
m_a_m_a [10]4 years ago
5 0

#1). correct

#2). B.  Convection is the process of hot and cold fluids FLOWING up and down, carrying heat from place to place that way.  That means there's gotta be some gas or liquid to flow from place to place, else you gotta no convection.

#3). correct


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Match each prefix to the correct multiple of 10. 1. centi- 10 2. kilo- 100 3. deka- 1000 4. milli- 1/100 5. hecto- 1/10 6. deci-
Mice21 [21]

Explanation :

There are some basic metric conversions.

Prefix                   Multiple of 10

centi                            \frac{1}{100}

Kilo                              1000

deka                              10

milli                              \frac{1}{1000}

hecto                            100

deci                              \frac{1}{10}

For example :

1cm=\frac{1}{100}m\\\\1Km=1000m\\\\1mm=\frac{1}{1000}m\\\\1Km=10\text{ hecto meter}\\\\1Km=100\text{ deka meter}


7 0
3 years ago
Read 2 more answers
Atoms with certain characteristics are radioactive. Which is least likely to be radioactive? O A. all atoms with an atomic numbe
Luden [163]

Answer:

The answer an be the option A.

Explanation:

Because radioactive substances have atomic number greater than 82.

8 0
3 years ago
if the frequency of a sound wave in air remains constant, its energy can be varied by changing its what
Anastaziya [24]
Amplitude, is the answer to the question
6 0
3 years ago
Read 2 more answers
A radioactive substance decays exponentially. A scientist begins with 200 milligrams of a radioactive substance. After 17 hours,
lianna [129]

75.17 mg of the radioactive substance will remain after 24 hours.

Answer:

Explanation:

Any radioactive substance will obey the exponential decay behavior. So according to this behavior, any radioactive substance will be decaying in terms of exponential form of disintegration constant and Time.

Disintegration constant is the rate of decay of radioactive elements. It can be measured using the half life time of the radioactive element .While half life time is the time taken by any radioactive element to decay half of its concentration. Like in this case, at first the scientist took 200 mg then after 17 hours, it got reduced to 100 g. So the half life time of this element is 17 hours.

Then Disintegration constant = 0.6932/Half Life time

Disintegration constant = 0.6932/17=0.041

Then as per the law of disintegration constant:

N = N_{0}e^{-xt}

Here N is the amount of radioactive element remaining at time t and N_{0} is the initial amount of sample, x is the disintegration constant.

So here, N_{0} = 200 mg, x = 0.041 and t = 24 hrs.

N = 200 ×e^{-24*0.041} =75.17 mg.

So 75.17 mg of the radioactive substance will remain after 24 hours.

3 0
3 years ago
Three hunters x,y and z aim at a bird on top of a tree.Their individual probabilities of killing the bird are 3/5,2/3 and 5/6 re
TiliK225 [7]

Answer:

1   3/5*2/3=6/15

2   (3/5*2/3)+(2/3*5/6)+(3/5*5/6)=Ans

3  same as 2 i think

4  3/5+2/3+5/6=ans

5 (1-3/5)*(1-2/3)*(1-5/6)

Explanation

1 means x and y... for such a  we multiply the probabilities

2 means x and y or x and z or y and z9 multiply ands  add ors

3 i think it is same as 2

4 for this you have to negate the probabilities of killing to find that of not killing.   Since it will be x and y and z, you multiply the final probabilities

:)

3 0
3 years ago
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