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lorasvet [3.4K]

4 years ago

5

Which is the SI base unit for mass?

2 answers:

Paul [167]4 years ago

8 0

It is kilograms in mass. (B)

Nice try though :)

MrRa [10]4 years ago

4 0

The answer that I am seeing is that its kg because it means kilograms.

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The position coordinate of a particle which is confined to move along a straight line is given by s =2t3−24t+6, where s is measu

Gre4nikov [31]

Answer:

a) the answer is t=4 seconds

b) acceleration is zero

c) displacement= 142 m

Explanation:

Given the position of the particle

$s=2t^3-24t+6$

a) the time required when velocity $v=72 m/s$

$v=72=\frac{ds}{st}=6t^2-24$

now we solve for time $t$

$6t^2=72+24=96\\\\\implies t^2=\frac{96}{6}\\\therefore t=4 s$

b) acceleration when $v=30 m/s$

acceleration is the time derivative of velocity i.e

$a=\frac{dv}{dt}=\frac{d}{dt}(30)=0$

c) the net displacement of the particle during the interval t = 1 s to t = 4 s is

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4 years ago

Doc Brown has calculated that his Delorean can accelerate at a rate of 2.52 m/s/s. How far away must he and Marty stand to allow

devlian [24]

Answer:

d = 303.33 m

Explanation:

Given that,

Acceleration of Doc Brown is 2.52 m/s²

The initial speed of Doc Brown is 0 as it was at rest.

Final speed of Doc Brown is 39.1 m/s

We need to find the distance between he and Marty. Let the distance is d. Using equation of motion as follows :

$v^2-u^2=2ad\\\\\text{Put u = 0}\\\\d=\dfrac{v^2}{2a}\\\\d=\dfrac{(39.1)^2}{2\times 2.52}\\\\d=303.33\ m$

So, the distance between he and Marty is 303.33 m.

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3 years ago