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elena55 [62]
3 years ago
13

Before there was central heating, hot water bottles were used to keep people warm at night. These flat containers were filled wi

th hot water and placed at the foot of the bed, under the blankets. How was the heat energy transferred from the hot water bottle into the space under the blankets?
Physics
1 answer:
mestny [16]3 years ago
8 0
The answer is D radiation because the heat from the hot water bottle is radiating the space around the hot water bottle. Hope this helps
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Carly rode her bike for 300 meters in 30 seconds. One can calculate her​
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Answer:

10

Explanation:

300 ÷ 30 = 10

Answer - 10

Hope this helps!!!

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Identify two factors that determine the intensity of sound
anastassius [24]

Amplitude and distance.

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Which sentence correctly describes a friction force? A. It acts in the same direction as the motion of an object. B. It acts in
KatRina [158]

Answer:

B

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Friction acts in a direction opposite to the motion of an object

5 0
3 years ago
A cube of metal has a mass of 11 grams and a volume of 1 cm . When fully submerged in water this metal cube hanging from an accu
Anarel [89]

Answer:

0.098 N

Explanation:

From the question,

Spring scale reading = W-U............... Equation 1

Where W = weight of the cube, U = upthrust.

W = mg

Where m =  mass of the cube, g = acceleration due to gravity.

Given: m = 11 g = 0.011 kg, g = 9.8 m/s².

W = 0.011(9.8)

W = 0.1078 N.

From Archimedes principle,

Upthrust = weight of water displaced.

U = (Density of water×volume of metal cube)×acceleration due to gravity.

U = (D×V)g

Given: D = 1000 kg/m², V = 1 cm³ = (1/1000000) = 1×10⁻⁶ m³, g - 9.8 m/s²

U = 1000(9.8)(10⁻⁶)

U = 0.0098 N.

Substitute the value of W and U into equation 1

Reading of the spring scale = 0.1078-0.0098

Reading of the spring scale = 0.098 N

7 0
3 years ago
Does the speed of the object affect friction?
Volgvan

Answer:

it would

Explanation:

this is because as something rubs against a surface fast, friction heats it up, like when you rub a surface fast and it gets warm on the palm of your hand, that is friction. hope it helped :)

6 0
2 years ago
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