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3 years ago

If you are given force and distance you can determine power if you know

Physics

2 answers:

weeeeeb [17]3 years ago

8 0

Yes, we can determine power if we know force and distance.
As power= Force x velocity
and velocity= distance/ time.

SVETLANKA909090 [29]3 years ago

7 0

Knowing the force and distance tells you the amount of work.

You can determine power (rate of work) if you also know the
length of time time that the force lasted over the distance.

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Final naïve case: If the highest-pitch string on the piano is made of spring steel (density = 7800 kg/m3) with a diameter of 1/3

oksano4ka [1.4K]

Answer:

The linear density is $K = 3.863 *10^{-3 } \ kg/m$

Explanation:

From the question we are told that

The density of steel is $\rho = 7800 \ kg/m^3$

The diameter of the string is $d = 0.794 \ mm = 7.94 *10^{-4} \ m$

The radius of the string is evaluated as $r = \frac{D}{2} = \frac{7.94 *10^{-4}}{2} = 3.97*10^{-4} \ m$

The volume of the string is mathematically evaluated as

$V = \pi * r ^2 * L$

Now assuming that the length of the string is L = 2 m

$V = 3.142 * (3.97 *10^{-4})^2 * (2)$

$V = 9.9041 *10^{-7} \ m^3$

Then the mass of the string would be

$m = \rho * V$

substituting value

$m = 7800*9.904 14 *10^{-7}$

$m = 7.73*10^{-3} \ kg$

Looking at the question we see that the unit of the linear density is $\frac{kg}{m}$

Hence the linear density is evaluated as

$K = \frac{m}{L}$

substituting value

$K = \frac{7.73 *10^{-3}}{2}$

$K = 3.863 *10^{-3 } \ kg/m$

8 0

3 years ago

Can anyone help me learn Malus's law in optics?

Harlamova29_29 [7]

Answer:

It is also called law of Malus,the law states that the intensity of a beam of plane-polarized light after passing through a rotatable polarizer varies as square of the cosine of the angle through which the polarizer is rotated from the position that gives maximum intensity expand.

Before u can know it u have to understand it, so go through it over and over again and u will get it.

8 0

3 years ago

Which of the following safety devices provides a weak link in a circuit that will melt if it received too much current, thus bre

SVETLANKA909090 [29]

The correct answer is B. Fuse.

Fuses were commonly used in houses up to recent ages, when circuit breakers became the more popular options, as they don't have to be changed every time they melt, since they don't melt.

4 0

3 years ago

Read 2 more answers

What is congruence in science

aalyn [17]

Answer:

look it up on google

Explanation:

7 0

4 years ago

How many types of waves are there? What are the names?

Semenov [28]

Answer:

Mechanical waves

Electromagnetic waves

Matter waves

Longitudinal waves

Transverse waves

Surface waves

Explanation:

Pls give Brainliest!!

8 0

3 years ago