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Diano4ka-milaya [45]
3 years ago
14

A fish-tank heater is rated at 96 W when connected to 120 V. The heating element is a coil of Nichrome wire. When uncoiled, the

wire has a total length of 4.2 m . What is the diameter of the wire?
Physics
1 answer:
nexus9112 [7]3 years ago
3 0

Answer:

0.232 mm.

Explanation:

Power, P = 96 W

Voltage, V = 120 V

Length of wire, l = 4.2 m

Let r be the radius of the wire.

Resistivity of nichrome, ρ = 1.5 x 10^-6 ohm metre

P = V^2 / R

R = 120 x 120 / 96 = 150 ohm

R = \rho \frac{l}{A}=\rho \frac{l}{\pi r^{2}}

r^2= \rho \frac{l}{\pi \times R}

r^2= \1.5\times10^{-6} \frac{4.2}{3.14 \times 150}

r = 1.16 x 10^-4 m

Diameter = 2 x r = 2 x 1.16 x 10^-4 = 2.32 x 10^-4 m = 0.232 mm

Thus, the diameter of the wire is 0.232 mm.

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Answer:

20 seconds.

Explanation:

The following data were obtained from the question:

Distance = 10 m

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With the above formula, we can obtain the time taken for the ball to travel a distance of 10 m as shown below:

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6 0
3 years ago
Write an expression for the potential energy UD of a particle when it is at a distance D from the force center, in terms of B an
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7 0
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Two blocks of masses m and 3m are placed on a frictionless, horizontal surface. A light spring is attached to the more massive b
ivanzaharov [21]

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4 0
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a 1 gram spiders sits on a platform rotating at 78 rpm. the spider is 15 cm from the centre disk. find the speed of the spider
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</em>
(After the last appearance of pi,
all numbers are rounded.)<em>

</em>
8 0
3 years ago
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