3 years ago

What does a step-up transformer do?

Physics

2 answers:

Lostsunrise [7]3 years ago

8 0

C.it steps up the voltage

Alla [95]3 years ago

4 0

Answer:

C. It steps up the voltage.

Explanation:

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torisob [31]

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3 years ago

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A 500 Kg load is lifted through a vertical height of 10m in 25s by a crane. Calculate the power of the crane

denis23 [38]

Answer:

1962 W

Explanation:

P = W/t

P = F d cos theta / t

P = (500 kg) (9.81 m/s^2) (10 m) (cos 180) / 25 s <-- the displacement and the force act in opposite directions (but it doesn't matter because direction doesn't matter in this case)

P = 1962 W

8 0

2 years ago

A plane flies 1,995 miles in a southwesterly direction from Baltimore to Phoenix in 5.00 hours . What is the velocity of the pla

disa [49]

displacement of the plane is given as

$d = 1995 miles$

time taken by the plane

$t = 5.00 hours$

now the velocity is given as

$v = \frac{displacement}{time}$

$v = \frac{1995}{5}$

$v = 399 mi/h$

so the velocity of airplane is 399 mi/h towards South West

4 0

3 years ago

A toy helium balloon is initially at a temperature of T = 24o C. Its initial volume is 0.0042 m3 (It is a 10 cm radius sphere).

Anettt [7]

Answer:

$T_{f} = 335.780\,K\,(62.630\,^{\textdegree}C)$

Explanation:

Let assume that air behaves ideally. The equation of state of ideal gases is:

$P\cdot V = n\cdot R_{u}\cdot T$

Where:

$P$ - Pressure, in kPa.

$V$ - Volume, in m³.

$n$ - Quantity of moles, in kmol.

$R_{u}$ - Ideal gas constant, in $\frac{kPa\cdot m^{3}}{kmol\cdot K}$ .

$T$ - Temperature, in K.

Since there is no changes in pressure or the quantity of moles, the following relationship between initial and final volumes and temperatures is built:

$\frac{V_{o}}{T_{o}} = \frac{V_{f}}{T_{f}}$