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natita [175]
3 years ago
12

11. A 6.0‐m wire with a mass of 50 g, is under tension. A transverse wave, for which the frequency is 810 Hz, the wavelength is

0.40 m, and the amplitude is 4.0 mm, is propagating on the wire. The time for a crest of this wave to travel the length of the wire is closest to A) 19 ms B) 16 ms C) 21 ms D) 23 ms E) 25 ms
Physics
1 answer:
Irina-Kira [14]3 years ago
4 0

Answer:

Time will be 19 ms so option (a) is correct option

Explanation:

We have given that mass of wire m = 50 gram = 0.5 kg

Frequency f = 810 Hz

Wavelength = 0.4 m

Velocity is given by

v=wavelength\times frequency=810\times 0.4=324m/sec

Amplitude is given as d = 6 m

So time t=\frac{distance}{velocity}=\frac{6}{324}=0.01851=19ms

So option (a) is correct option

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Liono4ka [1.6K]

"1 watt" means 1 joule of energy per second.

75 W means 75 joules/sec .

Energy = (75 Joule/sec) x (12 min) x (60 sec/min)

Energy = (75 x 12 x 60) (Joule-<em>min-sec</em> / <em>sec-min</em>)

<em>Energy = 54,000 Joules</em>

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2 years ago
Which of the following elements is the most chemically reactive?
ivolga24 [154]

Answer:

B) Fluorine

Explanation:

The most reactive element is fluorine, the first element in the halogen group. The most reactive metal is francium, the last alkali metal (and most expensive element).

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What two factors determine the force of gravity between two objects?
Yuki888 [10]

Answer:

Mass and distance between them are two factors on which force of gravity depends

Explanation:

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5 0
3 years ago
A portable DVD player requires six 1.5-volt batteries to operate. If the resistance in the circuit is 7.2 ohms, what is the curr
daser333 [38]

Hello!

A portable DVD player requires six 1.5-volt batteries to operate. If the resistance in the circuit is 7.2 ohms, what is the current?

Data:

We have six 1.5 volt batteries, soon, your tension (V)

V = 1.5 * 6 = 9 Volts

R (resistance) = 7.2 ohms

I (Current intensity) = ? (in Amps)

Solving (Ohm's First Law):

I = \dfrac{V}{R}

I = \dfrac{9}{7.2}

\boxed{\boxed{I= 1.25\:A}}\end{array}}\qquad\checkmark

Answer: 

The current is 1.25 amps

_______________________

I Hope this helps, greetings ... Dexteright02! =)

5 0
3 years ago
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