3 years ago

Qliestion 5 (1 point)

Physics

1 answer:

love history [14]3 years ago

4 0

Answer:

-3.33 ms^-2

Explanation:

Hope it helps

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Given that o.2i+bj+o.4k is a unit vector,what is the value of b?

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Answer:

b = 0.89

Explanation:

The given vector is, $A=0.2i+bj+0.4k$

A is a unit vector

We need to find the value of b.

For a unit vector, |A| = 1

So,

$0.2^2+b^2+0.4^2=1\\\\0.04+b^2+0.16=1\\\\0.2+b^2=1\\\\b^2=1-0.2\\\\b=0.89$

So, th value of b is 0.89.

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An angry mob lynches a phsical teacher after receiving their grades. They throw the physics teacher off a tall building . They t

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Answer:

5010 m

Explanation:

The vertical position of the teacher at time t can be found by using the equation:

$y(t) = h + ut+ \frac{1}{2}gt^2$

where

h is the initial height

$u = -20 m/s$ is the initial velocity (negative since it's downward)

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The teacher reaches the ground when y = 0, so the equation becomes

$h=-ut-\frac{1}{2}gt^2$

Substituting t = 30 s, we find the initial height:

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3 years ago

Two cars A and B are moving with velocities 20 m/s and 15 m/s in the direction east and west respectively. If

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Answer:

Distance between them is 4,200 meters.

Explanation:

Consinder car A:

${ \bf{distance = speed \times time }}$

substitute:

$distance = 20 \times (2 \times 60) \\ = 2400 \: m$

Consider car B:

$distance = 15 \times (2 \times 60) \\ = 1800 \: m$

since these cars move in opposite directions, distance between them is their summation:

$distance \: between = { \sum(distance \: of \: each \: car)} \\ = 2400 + 1800 \\ = 4200 \: m$

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3 years ago