3 years ago

How is a ray simliar to a line?

1 answer:

7 0

A ray is similar to a line because a line is a straight set of points that extend in opposite directions without ending. A ray is a part of a line that has one endpoint and extends in one direction without ending.

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Three fifths of the cast in a musical have to sing.What fraction on the cast does not have to sing?

notka56 [123]

The term "three fifths" is equivalent to $\frac{3}{5}$ .
If $\frac{3}{5}$ of the cast is singing, then we just have to find the rest of the fraction.
$1- \frac{3}{5} \\ \frac{5}{5}- \frac{3}{5} \\ \frac{2}{5}$

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3 years ago

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What is the force required to move a 2,000 kg car with an acceleration of 2 m/s/s?

Airida [17]

We know that According to Newton's Second Law that :

Force acting on an object is equal to the Mass of that Object multiplied by the Acceleration of that Object.

Given Mass of the Car as : 2000 kg

Acceleration of the Car as : 2 m/s²

Force required to move the Car = 2000 × 2 = 4000 Newton

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3 years ago

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A radioactive substance decays exponentially. A scientist begins with 190 milligrams of a radioactive

worty [1.4K]

Answer: 65.1 (mg)

Step-by-step explanation:

$y=190*e^{-a*t}\\\\Calculate\ a:\\\\t=33,y=95(mg)\\\\190*e^{-a*33}=95\\\\e^{-a*33}=0.5\\\\-a*33=ln(0.5)\\\\a=\dfrac{ln(\dfrac{1}{2}) }{-33} \\\\a=0,02100... \approx{0.021}\\\\If\ t=51\ h, y=190*e^{-0.02100*51}=65.09167...\approx{65.1}$