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3 years ago

Tin shears have longer handles than the scissors used to cut cloth why

Physics

1 answer:

Irina18 [472]3 years ago

4 0

Answer:

A pair of scissors used to cut a piece of cloth has blades longer than the handles so that the blades move longer on the cloth than the movement at the handles.

While shears used for cutting metals have short blades and long handles because as it enables us to overcome large resistive force by a small effort.

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If a substance has a density of 2.7g/cm3 and a mass of 86.4g, what is its volume?

Gennadij [26K]

Answer:

32cm³

Explanation:

Given parameters:

Density of substance = 2.7g/cm³

Mass of substance = 86.4g

Unknown:

Volume of substance = ?

Solution:

Density is the mass per unit volume of a substance.

Density = $\frac{mass}{volume}$

Since the unknown is volume we solve for it;

mass = density x volume

86.4 = 2.7 x volume

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3 years ago

A car accelerates from 0 to 30m/s in 3s. Calculate its acceleration

creativ13 [48]

Answer:

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3 years ago

Please help!! giving a lot of points

Readme [11.4K]

Question 1.

mass = 4500 kg
potential energy (p.e) = 67500 J

now, we know :

=》

$p.e = mgh$

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$67500 = 4500 \times 10 \times h$

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$67500 = 45000 \times h$

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$h = \dfrac{67500}{45000}$

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note : if we take acceleration due to gravity as 9.8, then height = 1.53 m

Question 2.

mass = 4500 kg
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we know,

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$k.e = \dfrac{1}{2} mv {}^{2}$

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$63000 = \dfrac{1}{2} \times 4500 \times {v}^{2}$

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${v}^{2} = \dfrac{63000 \times 2}{4500}$

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${v}^{2} = 28$

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$v = \sqrt{28}$

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$5.29 \: \: ms {}^{ - 1}$

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3 years ago

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3 years ago

Tin shears have longer handles than the scissors used to cut cloth why ​

Tin shears have longer handles than the scissors used to cut cloth why