Analogy: atom is to element as ___

In an experiment of a simple pendulum, measurements show that the pendulum has length し 0.397 ± 0.006 m, mass M-0.3172 ± 0.0002

vichka [17]

Answer:

1.)1.265+or minus 0.0006m

2).0.71%

Explanation:

See attached file

6 0

2 years ago

You have two electrical devices plugged into the same socket in parallel and draws 120 V. The first device has a resistance of 2

erik [133]

The devices don't "draw" 120v. The 120v comes to your house from the power company. They decide it should be 120v and that's what they send you. It's hypothetically technically possible for you to change that, but if you try it, you'll definitely burn the house down.

The total resistance of those two devices in parallel is 6 and 2/3 ohms. That doesn't depend on what they're plugged into. It would still be 6 and 2/3 ohms if they were connected in parallel, wrapped in tissue, sealed in a jar of chicken soup and stored in a box on a high shelf.

But since they ARE plugged into 120v, they draw 18 Amperes from the socket, and they turn all of that electrical energy into 2160 watts of heat. That's about the same as a good size toaster oven, and you have to figure out a way to get rid of all that heat before you burn the house down.

4 0

2 years ago

It takes 300 newtons of force and a distance of 20 meters for a moving car to come to stop

Arlecino [84]

The answer is 15 I think.

6 0

2 years ago

A liquid flowing from a vertical pipe has a very definite shape as it flows from the pipe. To get the equation for this shape, a

Eva8 [605]

Calculating speed as function of distance y is fairly easy. Once water leaves pipe it is under free fall which means that it is accelerating with gravitational acceleration "a".
V=Vo + Vff where Vff is speed gained due to free fall.
$Vff = t*a = \sqrt{2ay}$
$V = Vo + \sqrt{2ay}$

Calculating radius of stream is a little bit more complicated. Because water is accelerating as it falls it has to lower its radius. The reason for this is that water flow must be the same as one at the exit of pipe. Water flow is expressed in liters/meter^3
Because of this we write condition:
V1/V2 = A2/A1 where A2 and A1 are sections of water stream.
let V1 and A1 be the speed and section of water stream at the end of pipe.
A2 = V1*A1/V2

$r^{2} = \frac{Vo* r_{0} ^{2} }{Vo+ \sqrt{2ay} }$

4 0

3 years ago

Read 2 more answers

A thin rod of length 0.83 m and mass 110 g is suspended freely from one end. It is pulled to one side and then allowed to swing

VARVARA [1.3K]

Explanation:

(a) The given data is as follows.

Length of the rod, L = 0.83 m

Mass of the rod, m = 110 g = 0.11 (as 1 kg = 1000 g)

At the lowest point, angular speed of the rod ( $\omega$ ) = 5.71 rad/s