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meriva
3 years ago
10

Some thermal containers have layers of materials to keep drinks cold for as long as possible. Which design would help keep ice f

rozen for the longest period?​
A. Inner core of steel, no air gap, outer layer of plastic

B. Inner core of steel, air gap, outler layer of glass

C. Inner core of steel, no air gap, outer layer of plastic

D. Inner core of glass, air gap, outer layer of glass


I know A. and C. are the same, but those are my options.
Physics
2 answers:
MakcuM [25]3 years ago
8 0

Answer:

D.

Explanation:

grin007 [14]3 years ago
5 0
The answer is D correct me if I’m wrong
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Helpp pleaseeeeee …..
Lilit [14]

Answer:

300 cos 30 = 40 a + 40 * .2 * 10

Total force = mass * acceleration + frictional force

260 = 40 a + 80

a = 180 / 40 = 4.5 m/s^2

Check:

15 a + 15 * 10 * .2 = T    acceleration of 15 kg block (assuming a = 4.5)

T = 15 (4.5) + 30 = 97.5     force required to accelerate 15 kg block

260 - 97.5 = 162.5     net force on 25 kg block

162.5 = 4.5 (25) + 25 * 10 * .2

162.5 = 112.5 + 50 = 162.5

4.5 m/s^2 checks out as correct

8 0
2 years ago
A fire engine approaches a wall at 5 m/s while the siren emits a tone of 500 Hz frequency. At the time, the speed of sound in ai
Svetach [21]

Answer:

The  values is  f_b  =14.9 \  beats/s

Explanation:

From the question we are told that

   The  speed of the fire engine is  v =  5\ m/s

    The frequency of the tone is  f =  500 \ Hz

    The speed of sound in air is v_s  =  340 \ m/s

The  beat frequency is mathematically represented as

     f_b  =  f_a  -  f

Where  f_a is the frequency of sound heard by the people in the fire engine and is is mathematically evaluated as

   f_a  =  [\frac{v_s + v }{v_s  -v} ]* f

substituting values

  f_a  =  [\frac{340 + 5 }{340  -5} ]* 500

  f_a  = 514.9 \  Hz

Thus  

      f_b  =514.9 -  500

      f_b  =14.9 \  beats/s

8 0
3 years ago
Which of the following is not an example of an engine?
SashulF [63]
The answer is A. waterfall
To be considered as an engine , it should be a Man-made objects that could be used to produce power that creates motions.
From all the options above could be used to produce such power, but the waterfall is not made by mandkind
4 0
3 years ago
If the Moon rises at 7 A.M. on a particular day, then approximately what time will it rise four days later?
Gelneren [198K]

Answer:

10:33 am

Explanation:

3 0
3 years ago
what us the velocity in meters per second of a runner who runs exactly 110 m toward the beach in 72 secs
finlep [7]

Velocity = Distance / time taken

   =  110 m /72s

     1.52  ms⁻¹

4 0
3 years ago
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