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4 years ago

14

Dimas reads that it takes 270 n to lift a firefighter’s equipment. if a firefighter does 5400 j of work carrying the equipment u

p a staircase, how high does the firefighter climb? (work: w = fd)

2 answers:

gulaghasi [49]4 years ago

8 0

Answer:

its A on Edg2020

Explanation:

sasho [114]4 years ago

3 0

W=force × displacement
5400=270× displacement
20meters=displacement

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Find the ratio of the diameter of iron to copper wire, if they have the same resistance per unit length (as they might in househ

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Answer:

The ratio of the diameter of iron to Cu is;

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Explanation:

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L is length,
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from the question the two materials have the same resistance per unit length.

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re-arranging the equation we have,

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Read 2 more answers

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Answer:

Explanation:

1 )

Here

wave length used that is λ = 580 nm

=580 x 10⁻⁹

distance between slit d = .46 mm

= .46 x 10⁻³

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= λ / d radian

= 580 x 10⁻⁹ / .46 x 10⁻³

= 0.126 x 10⁻² radian

2 )

Angular position of second order interference maxima

2 x 0.126 x 10⁻² radian

= 0.252 x 10⁻² radian

3 )

For intensity distribution the formula is

I = I₀ cos²δ/2 ( δ is phase difference of two lights.

For angular position of θ1

δ = .126 x 10⁻² radian

I = I₀ cos².126x 10⁻²/2

= I₀ X .998

For angular position of θ2

I = I₀ cos².126x2x 10⁻²/2

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3 years ago

Carol drops a stone in a mine shaft 122.5 metres deep.How

Verizon [17]

Answer:

T = 5.36 s

Explanation:

given,

depth of the mine shaft = 122.5 m

speed of the sound = 340 m/s

time taken = ?

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T = 5 + 0.36

T = 5.36 s

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3 years ago