3 years ago

What are the three types of friction and when does each apply

1 answer:

4 0

Sliding: when an object slides across a surface
rolling: when an object rolls across a surface
static is when something ain't moving

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What is the dot product of a= -2i - 5j and b=i -4j

Dafna1 [17]

I.i = j.j = 1
i.j = j.i = 0

(-2i - 5j)(i -4j)
= (-2i).i + (-2i).(-4j) + (-5j).i + (-5j).(-4j)
= -2 + 0 + 0 + 20 = 18

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3 years ago

Question 1

galina1969 [7]

1/f= 1/di+1/do
1/f=1/90m+1/40m
1/f ≈27.7m

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3 years ago

Ganezh [65]

Answer:

A. topsoil the answer

Explanation:

I think its a correct answer

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3 years ago

How much work is done by a forklift raising a 125 kg object a distance of 10 meters?

lozanna [386]

W = Fd

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3 years ago

A U-shaped tube open to the air at both ends contains some mercury. A quantity of water is carefully poured into the left arm of

Gekata [30.6K]

Answer:

a) $P=2450\ Pa$

b) $\delta h=23.162\ cm$

Explanation:

Given:

height of water in one arm of the u-tube, $h_w=25\ cm=0.25\ m$

Gauge pressure at the water-mercury interface,:

$P=\rho_w.g.h_w$

we've the density of the water $=1000\ kg.m^{-3}$

$P=1000\times 9.8\times 0.25$

$P=2450\ Pa$

Now the same pressure is balanced by the mercury column in the other arm of the tube:

$\rho_w.g.h_w=\rho_m.g.h_m$

$1000\times 9.8\times 0.25=13600\times 9.8\times h_m$

$h_m=0.01838\ m=1.838\ cm$

<u>Now the difference in the column is :</u>

$\delta h=h_w-h_m$

$\delta h=25-1.838$

$\delta h=23.162\ cm$

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3 years ago