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algol [13]
3 years ago
10

QUESTION 1 67.2 kilometers = how many decameters

Physics
2 answers:
sweet-ann [11.9K]3 years ago
8 0

Answer:

67.2 kilometers =6720 decamaters

den301095 [7]3 years ago
6 0

Answer: the answer should be 6,720 decameters.

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The table lists information about four devices. A 4 column table with 4 rows. The first column is labeled device with entries W,
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Answer:

X, Y, Z, W

Explanation:

W has a current of 0 so it has no magnetic field.

X has the most loops (besides W) and the most current so it is the strongest.

Y and Z are the same except Y has more loops so it is stronger than Z.

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4 years ago
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A pair of eyeglass frames are made of an epoxy plastic (coefficient of linear expansion = 122 ✕ 10-6 °C-1). At room temperature
il63 [147K]

Answer:

The new temperature is  T_1 =  60.78^oC

Explanation:

From the question we are told that

   The coefficient of linear expansion is  \sigma  =  122 *10^{-6} \ ^oC^{-1}

    The temperature is  T  =  20.0 ^oC

    The radius of the frames is r =  2.00 \  cm  = 0.02 \ m

    The new radius is  r_2 =  2.01 \ cm =  0.021 \ m

The change in radius is mathematically represented as

       \Delta r =  r_1 -r

substituting values

       \Delta r =  2.01 - 2.00

       \Delta r =  0.01 \ m

The increase in radius can also be mathematically represented as

     \Delta  r  =  r * \sigma (T_1 -T)

Where T_1 is the the new temperature , making it the subject we have

      T_1 =  \frac{\Delta  r}{r * \sigma  } + T

substituting value  

     T_1 =  \frac{0.01}{2.01 *122*10^{-6}  } + 20

    T_1 =  60.78^oC

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3 years ago
The frequency of sound will decrease when; A) The source approaches a stationary observer
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The Doppler effect says that if the source of a sound wave and the observer are moving further apart, the frequency of the sound as the observer hears it will decrease. This can be caused by the source moving away from the observer or the observer moving away from the source. Both C and D will cause the decrease in frequency.

Choice F

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Which injury stimulates muscle growth
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3 years ago
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 A ballet dancer has a maximum net torque of 45 Nm, and the moment of inertia of his body is 30 kg mA2. if he starts twirling fr
Verdich [7]

Answer:

(a) 142.5 rad/s

Explanation:

Torque = 45 Nm

Moment of inertia = 30 kgm^2

w0 = 0, t = 95 second

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Torque = moment of inertia x angular acceleration

45 = 30 x α

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w = w0 + α t

w = 0 + 1.5 x 95

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