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4 years ago

What happens when all the external forces on a system are balanced ?

1 answer:

5 0

Equilibrium refers to a state in which all of the external forces on an object all balance each other such that there is no net effect (net force equals 0). An object in equilibrium will not experience acceleration, and will either remain at rest, or continue moving at a constant velocity. Here's a simple example, pick up a book (or any random object) and hold it up in the air. The book is now in equilibrium, the downwards force of gravity is perfectly countered by the upwards force that you are applying to it. Notice that the object neither falls nor goes upwards (i.e. no acceleration). Now let go of the book, notice how it falls downwards till it hits the ground (or whatever was beneath it). That is because without the upwards force applied by your hand, the object is no longer in equilibrium, and the force of gravity takes over until it is in equilibrium again.

You might be interested in

What visible wavelengths of light are strongly reflected from a 390-nm-thick soap bubble?

DiKsa [7]

Answer:

So visible wavelength which is possible here is

416 nm and 693.3 nm

Explanation:

As we know that for normal incidence of light the path difference of the reflected ray is given as

$2\mu t + \frac{\lambda}{2} = \Delta x$

so here we can say that for maximum intensity condition we will have

$\Delta x = N\lambda$

so we have

$2\mu t + \frac{\lambda}{2} = N\lambda$

now for visible wavelength we have

for N = 1

$2\mu t = \frac{\lambda}{2}$

$\lambda = 4\mu t$

$\lambda = 4(\frac{4}{3})(390 nm)$

$\lambda = 2080 nm$

for N = 2

$\lambda = \frac{4\mu t}{3}$

$\lambda = \frac{4(\frac{4}{3})(390 nm)}{3}$

$\lambda = 693.3 nm$

for N = 3

$\lambda = \frac{4\mu t}{5}$

$\lambda = \frac{4(\frac{4}{3})(390 nm)}{5}$

$\lambda = 416 nm$

6 0

4 years ago

A copper wire of diameter 0.80 mm fails at an engineering stress = 248.2 MPa. Its ductility is measured as 75% reduction of area

Anvisha [2.4K]

Answer:

true stress = 992.8 MPA

true strain = 1.386

Explanation:

see the attached file

4 0

3 years ago

A plane is travelling at 250km/h and must reach a target that is 3h 58min away. The distance to the target is. *

wariber [46]

Answer:

B) 89500 km

Explanation:

speed = distance / time

time= 3h 58 min = 30+58/60= 30.966 h = 31 hrs (approxx)

250= distance / 31

250× 31= distance

distance = 7750 ( approxx)

but none of the given options is 7750 km so we will choose the answer nearest to it,

therefore 89500km is the right answer

5 0

3 years ago

Winds are turned to the left in the Southern Hemisphere.<br><br> true or false

Nutka1998 [239]

Answer:

true

Explanation:

The force, called the "Coriolis effect," causes the direction of winds and ocean currents to be deflected. In the Northern Hemisphere, wind and currents are deflected toward the right, in the Southern Hemisphere they are deflected to the left.

4 0

4 years ago

On a cold day, the speed of sound in air is 330 m/s. A note with a frequency of 1,320 Hz is played on an instrument. What is the

solmaris [256]

As we know that speed of sound is

$v = 330 m/s$