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mel-nik [20]
3 years ago
15

Pls help quick too.................

Physics
1 answer:
statuscvo [17]3 years ago
4 0

Answer:

Pulley = Flag Pole

Screw = Side latch

Wedge = Scissors

Wheel and axle = Car

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If a 580 N net force acts on a 40 kg what will the acceleration of the car be
myrzilka [38]

Answer:

I think u have to do 580N times 40KG

7 0
2 years ago
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Scientists study how the continents move. Why might scientists use a model
tigry1 [53]

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B. It is too slow to observe directly

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They move too slow to be able to observe how they move.


I hope it helps! Have a great day!
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The resistivity of a metal increases slightly with increased temperature. This can be expressed as rho= rho0[1+α(T−T0)] , where
Stolb23 [73]

Answer:

At 81. 52 Deg C its resistance will be 0.31 Ω.

Explanation:

The resistance of wire =R_T =\frac{\rho_T \ l}{A}

Where R_T =Resistance of wire at Temperature T

\rho_T = Resistivity at temperature T =\rho_0 \ [1 \ + \alpha\ (T-T_0\ )]

Where T_0 =20\ Deg\ C , \  \rho_0 = Constant,  \alpha =3.9 \times 10^-^3 DegC^-1 \ (Given)

l=Length of the wire

& A = Area of cross section of wire

For long and thin wire the resistance & resistivity relation will be as follows

\frac{R_T_1}{R_T_2}=\frac{\rho_0(1+\alpha \cdot(T_1-2 0 )}{\rho_0(1+\alpha \cdot (T_2 -20 )}

\frac{0.25}{0.31}=\frac{1}{[1+\alpha(T-20)]}

1.24=1+\alpha (T-20)

0.24=\alpha(\ T -20 )

Putting\ the\ value\ of \alpha = 3.9 \times 10^-^3 DegC^-1

T = 81.52 Deg C

4 0
3 years ago
A person suffering from anaemia gets tired after a short walk​
FrozenT [24]

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you will feel weary after shorter times

5 0
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True or False: Speed is a vector quantity.
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it's false coz

Speed is a scalar quantity.

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3 years ago
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