3 years ago

Describe two energy conversions that take place when you warm a cup of cocoa in a microwave oven.

2 answers:

7 0

1.)the microwaves are absorbed by the water molecules in the cocoa. this causes the water molecules to vibrate very fast.

2.)this fast vibration causes the molecules to heat themselves up by means of bumping into each other (friction).

baherus [9]3 years ago

4 0

Electrical energy -> wave energy (microwave)
wave energy -> potential/heat energy (cup of cocoa)

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A 3.8 kg object is lifted 12 meters. approximately how much work is performed during the lifting.

Dmitry [639]

work done=446.9 J . so option (c) is correct.

Explanation:

the formula for work done is given by

W= F d

F= force= mg where m= mass and g= acceleration due to gravity

F= 3.8 (9.8)=37.24 J

so W=37.24 (12)

W=446.9 J

7 0

3 years ago

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Solnce55 [7]

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3 years ago

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iragen [17]

Explanation:

Hey there!

Given;

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Acceleration (a) = 10m/s^2.

Mass (m)=?

We have;

Force = mass * acceleration.

So,

100 = m * 10

Or, 100 = 10m

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Hope it helps....

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3 years ago

Please help to Calculate the lower and upper bound for 3.2 + 4.6

PSYCHO15rus [73]

Answer:

<h3>i think it is 7.10 </h3>

Explanation:

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An object changing its speed from 10m/s to 3m/s is

Marina86 [1]

I believe your answer would be
B. Slowing Down.

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2 years ago