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Gwar [14]
3 years ago
6

Which of the statements below is true?

Physics
1 answer:
Cloud [144]3 years ago
8 0

Answer:

An object’s weight is proportional to its mass.

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Explanation:

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A lever is used to lift a heavy rock. The mechanical advantage of the lever is 4 and the lever applies a force of 800 N to the r
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 The force applied to the lever is 400 N, because the force applied by the lever (800 N) divided by the mechanical advantage of the lever (4) equals
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2 years ago
A cord is wrapped around the rim of a solid uniform wheel 0.280 m in radius and of mass 7.80 kg. A steady horizontal pull of 34.
Crank

Solution :

Given :

Mass, m = 7.80 kg

Radius, r = 0.280 m

Force, F = 34 N

a). St = I x a

  $34 \times r = 7.8  r^2 \times \frac{a}{2}$

  $a=\frac{68}{7.8 \times 0.280}$

     $=31.13 \ rad/s^2$

b). The acceleration of the part of the chord is

    = 31.13 x 0.280

    $=8.7164 \ m/s^2$

c). Magnitude of the force is = $\sqrt{34^2 + (7.8 \times 9.81)^2}$

                                               = 83.73 N

d). The direction of force is = arctan (7.8 x 9.81)/34

                                             = 2.25

e). The answers in part (c) and (d) will change when the pull of force is given in the upward direction instead of giving in the horizontal direction

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2 years ago
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