What is— 2.5 • 10^-6

Mathematics

2 answers:

dexar [7]3 years ago

7 0

Answer:

0.0000025

Step-by-step explanation:

Anon25 [30]3 years ago

5 0

Answer:

I got 2500000

Step-by-step explanation:

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A force F=-2i+j+k acts at point A(1,5,1) on a solid which is free to turn about a fixed point Q(-1,2,1). Find the torque exerted

DerKrebs [107]

The torque exerted by the force on the body is $\vec \tau = 3\,\hat{i}-2\,\hat{j} + 8\,\hat{k}$ .

Vectorially speaking, the torque exerted ( $\vec \tau$ ) by the force on the body ( $\vec F$ ) is resulted from this expression:

$\vec \tau = \vec r_{QA} \times \vec F$ (1)

Where:

$\vec r_{QA}$ - Vector distance between points A and Q.
$\vec F$ - Vector force exerted at point A.

If we know that $\vec r_{QA} = (2, 3, 0)$ and $\vec F = (-2, 1, 1)$ , then the torque is:

$\vec \tau = \left|\begin{array}{ccc}\hat{i}&\hat{j}&\hat{k}\\2&3&0\\-2&1&1\end{array}\right|$

$\vec \tau = (3, -2, 8)$

The torque exerted by the force on the body is $\vec \tau = 3\,\hat{i}-2\,\hat{j} + 8\,\hat{k}$ .

To learn more on torque, we kindly invite to check this verified question: brainly.com/question/3388202

8 0

2 years ago

Mr. Smith invests a certain amount of money at 8% and twice as much at 5%. If his annual income from the two investments is $720

professor190 [17]

The amount invested by Mr.Smith in 5% is $240 .

<u>Step-by-step explanation:</u>

We have , Mr. Smith invests a certain amount of money at 8% and twice as much at 5%. If his annual income from the two investments is $720 . Let us suppose that Mr.Smith invest $x so :

Amount of money invested in 5% is $\frac{5x}{100}$ . And, amount of money invested in 8% is twice that of 5% i.e. $\frac{(2)5x}{100} = \frac{10x}{100}$ .