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Liula [17]
2 years ago
14

How far should pencil held from a convex mirror of radius 80 cm to form an image one-half the size of the pencil?

Physics
1 answer:
prisoha [69]2 years ago
4 0

Answer:

10.0

Explanation:

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A trombone can produce pitches ranging from 85 Hz to 660 Hz approximately. When the trombone is producing a 562 Hz tone, what is
tester [92]

To solve this problem we will apply the concept of wavelength, which warns that this is equivalent to the relationship between the speed of the air (in this case in through the air) and the frequency of that wave. The air is in standard conditions so we have the relation,

Frequency = f = 562Hz

Speed of sound in air = v = 331m/s

The definition of wavelength is,

\lambda = \frac{v}{f}

Here,

v = Velocity

f = Frequency

Replacing,

\lambda = \frac{331m/s}{562Hz}

\lambda = 0.589m

Therefore the wavelength of that tone in air at standard conditions is 0.589m

3 0
3 years ago
A 20 N force is applied to an object causing it to move 10 m. How much work was done on the object? How much energy was needed t
olga2289 [7]

Answer:

Here, force=20N and displacement=10m

Work=Force×Displacement=20N×10m=200Nm

3 0
3 years ago
Which observational tool helped astronomers Arno Penzias and Robert Wilson discover the existence of the cosmic microwave backgr
Softa [21]
<span>In 1964, while experimenting with the Holmdel Horn Antenna, which was used as a radio telescope, Penzias and Wilson accidentally discovered the microwave background radiation that exists universally. The Holmdel Horn Antenna was used to support the "Big Bang Theory" as opposed to the "Steady State Theory".</span>
4 0
3 years ago
A playground merry-go-round spins about its axis with negligible friction. A child moves from the center of the merry-go-round t
Juli2301 [7.4K]

Answer:

B

Explanation:

In this process on merry go round there is not any external torque so angular momentum will be conserve. Mass is always conserved.

4 0
2 years ago
What is the resistance of a resistor if the potential difference across the resistor is 1.6 V when a current of 0.5 A flows thro
MrRa [10]

Answer:

3.2Ω

Explanation:

V= IR

1.6V = 0.5A × R

R= 1.6/0.5

  1. R= 3.2Ω
3 0
3 years ago
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