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HACTEHA [7]
2 years ago
5

2. Four metal mugs with lids each contain the same volume of hot water at the same temperature. The mugs are made from the same

metal and are the same shape and size, but each has its outside surface painted with a different combination of texture and colour.
Which mug radiates thermal energy at the fastest rate?
A the mug painted shiny white
B the mug painted dull white
C the mug painted shiny black
D the mug painted dull black ​
Physics
1 answer:
olga_2 [115]2 years ago
4 0

Answer:

D. the mug painted dull black

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A 57-kg woman holds a 6-kg package as she stands within an elevator which briefly accelerates upward at a rate of 0.15g. Determi
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Answer:

R = 710.7N

L = 67.689 N

During gravity fall L = R = 0 N

Explanation:

So the acceleration that the elevator is acting on the woman (and the package) in order to result in a net acceleration of 0.15g is

g + 0.15g = 1.15g

The force R that the elevator exerts on her feet would be product of acceleration and total mass (Newton's 2nd law):

a(m + M) = 1.15g(57 + 6) = 1.15*9.81*63 = 710.7N

The force L that she exerts on the package would be:

am = 1.15g *6 = 1.15*9.81*6 = 67.689N

When the system is falling, all have a net acceleration of g. So the acceleration that the elevator exerts on the woman (and the package) is 0, and so are the forces L and R.

7 0
3 years ago
A mother and daughter press their hands together and then push apart while ice skating. Immediately after they push away from ea
kherson [118]

Answer:

J

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The daughter moves with greater acceleration backwards because of her weight.

7 0
3 years ago
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Which of the following elements do living things have that volcanic rocks don’t have? A) Oxygen B) Silicon C) Magnesium D) Carbo
Mrrafil [7]
Either A or D. If I were answering I'd go with my git answer and say A
5 0
3 years ago
Which two quantities below can be used to calculate average speed?
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PLEASE HELP I WILL GIVE BRAINLYEST!!
elena55 [62]

Answer:

I think B

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