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Alexxx [7]
4 years ago
9

HELPPPPP ASAPPP!!!!!!!

Physics
1 answer:
bezimeni [28]4 years ago
4 0

Answer:

The tension T in each of the cables, T = 98 N

Explanation:

Given,

The mass of the loudspeaker, m = 20.0 Kg

The suspended distance of the loudspeaker, d = 2.20 m

The length of each cable, l = 2.9 m

The tension experienced by the cable is given by the formula,

                           T = mg + ma    newton

Where,

                        g - acceleration due to gravity

                        a-acceleration produced by the stretched cable

Since the stretched cable and loudspeaker is not moving, then the tension force acting on the cable is equal to the force of gravity.

                              T = mg  newton

Substituting the values in the above equation

                              T = 20

                                 = 20.0 Kg x 9.8 m/s²

                                 = 196 N

This force is equally supported by the two cables, then the tension in each cable is

                                  T = 196 N / 2

                                     = 98 N

Hence, the tension T in each of the cables, T = 98 N

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nikklg [1K]

Answer:D) Egocentrism

Explanation:

Mr.Tong should be alerted to Piaget's concept of Egocentrism which is under the pre operational stage of Piaget's theory.

Following are the key features of Pre operational stage

  • Centration
  • Egocentrism
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The feelings and actions of children are usually self-centered. Egocentrism refers to the failure of the child to see a situation from another person Perception.

The self-centered child believes that other people see, hear, and feel exactly the same as the child does, according to Piaget.

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3 0
4 years ago
Star a has an absolute magnitude of 8. what is its apparent magnitude at a distance of 100 pc
tresset_1 [31]
From the definition of apparent magnitude, we know that:
m_{1} - m_{2} = -2.5Log( \frac{F_{1}}{F_{2}} )
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We also know that the flux is given by the formula:
F =  \frac{L}{4 \pi  d^{2} }
where:
L = luminosity
d = distance

Therefore:
\frac{F_{1} }{F_{2}} = (\frac{L_{1} }{4 \pi d_{1}^{2} })(\frac{4 \pi d_{2}^{2} }{L_{2} }) \\ =  \frac{L_{1}d_{2}^{2}}{L_{2}d_{1}^{2}}

Now, let's apply these formulae to the same star (therefore, same luminosity), using apparent magnitude and absolute magnitude (which is defined as the apparent magnitude the star would have if it were at a distance of 10pc):
m - M = 2.5 Log ( \frac{d}{10pc})^{2}

Now, let's solve for m:
m = M + 2.5 Log ( \frac{d}{10})^{2}
= <span>8 + 2.5 Log ( \frac{100}{10})^{2}</span>
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3 0
4 years ago
Hell please thanks!!!!!!’
Slav-nsk [51]

Answer:

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5 0
3 years ago
A steel wire of diameter 1 mm can support a tension of 0.24 kn. suppose you need a cable made of these wires to support a tensio
forsale [732]
Assuming the same deformation and elastic modulus, we can use the relationship:
(P/D)1 = (P/D)2
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3 years ago
A charge Q accumulates on the hollow metallic dome, of radius R, of a Van de Graaff generator. A probe measures the electric fie
andre [41]

The electric field changes by a factor 4/9

Explanation:

The electric field at a point outside a hollow charged sphere is identical to that produced by a single point charge Q, therefore its strength is given by

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So, the electric field has changed by a factor

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