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maks197457 [2]
2 years ago
14

A heating coil inside an electric kettle delivers 2.2 kW of electrical power to the water in the kettle. How long will it take t

o raise the temperature of 0.50 kg of water from 30.0° C to 72.0° C
Physics
1 answer:
Otrada [13]2 years ago
8 0

Answer:

0.04s

Explanation:

Specific heat of water c = 4.186J/g.C

The heat energy it would take to heat up 0.5 kg of water from 30C to 72 C is

E = mc\Delta T = 0.5 * 4.186 * (72 - 30) = 87.9 J

If the power of the electric kettle is 2.2kW (or 2200W) and suppose the work efficiency is 100%, then the time it takes to transfer that power is

t = \frac{E}{P} = \frac{87.9}{2200} = 0.04 s

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Answer:

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5 0
3 years ago
Please help I'll mark brainliest!!!!
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This question is based on the fundamental assumption of  vector direction.

A vector is  a physical quantity which has  magnitude as well direction  for its complete specification.

The magnitude of a physical quantity is simply a  numerical number .Hence it can not be negative.

A negative vector is a vector which comes into existence when it is opposite to our assumed direction with respect to any other vector.  For instance, the vector is taken positive if it is along + X axis and negative if it is along - X axis.

As per the first option it is given that a vector is negative if its magnitude is greater than 1. It is not correct as magnitude play no role in it.

The second option tells that the magnitude of the vector is less than 1. Magnitude can not be negative. So this is also wrong.

Third one tells that a vector is negative if its displacement is along north. It does not give any detail information about the negativity of a vector.

In a general sense we assume that vertically downward motion  is negative and vertically upward is positive. In case of a falling object the motion is  vertically downward. So the velocity of that object is negative .

So last   option is  partially  correct  as  the vector can be negative depending on our choice of co-ordinate system.





7 0
3 years ago
Read 2 more answers
003 (part 1 of 2) 10.0 points
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4 0
3 years ago
Se aplica una fuerza neta de 25 N a una masa de 10 kg. ¿Cuál es la aceleración dada a la masa?
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Answer:

Se queda

Explanation:

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4 0
3 years ago
How much force is needed to stop a body of mass 10kg​
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Answer:

Force of <u>1</u><u>0</u><u>0</u><u> </u><u>N</u><u> </u>will be needed.

Explanation:

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3 0
2 years ago
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