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Lana71 [14]
3 years ago
11

David wants to experiment with the device, so he connects an ammeter into the circuit and measures 11.5 AA when the device is co

nnected to the car's battery. From this, he calculates the time to boil a cup of water using the device. If the energy required is 100 kJkJ , how long does it take to boil a cup of water?
Physics
1 answer:
Mandarinka [93]3 years ago
4 0

Answer:

2.42hours

Explanation:

To calculate the time taken to boil the cup of water, we will use the formula

Q = It where

Q is the total energy required to boil the water = 100KJ = 100,000Joules

I is the current = 11.5A

t is the time taken to boil the water

t = Q/I

t = 100,000/11.5

t = 8695.65seconds

t = 2.42hours

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The center of mass of the two objects is the average position of the parts of the two object system

The center of mass of block <em>A</em>, and block <em>B</em>  after displacement of block <em>B</em> is at <u>20 m from block </u><u><em>A</em></u>

<em />

Reason:

The given parameters are;

The position of block A and block B at t = 0 is x = 0

The mass of block A, m₁ = 8 kg

Mass of block B, m₂ = 16 kg

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Speed of block <em>B</em>, v₂ = 10 m/s

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The location of block <em>A</em>, after 3 s is x₁ = 0 (block A is at rest)

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The center of mass of the two objects is at at the position x = <u>20 m</u> (from block <em>A</em>)

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