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3 years ago

All molecules of one substance are ________ .

Physics

2 answers:

Gala2k [10]3 years ago

5 0

Answer:

All molecules of one substance are identical (exactly the same)(2)

kvasek [131]3 years ago

3 0

All molecules of one substance is exactly the same

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A spotlight on the ground shines on a wall 12 m away. If a man 2 m tall walks from the spotlight toward the building at a speed

Tju [1.3M]

Answer:

v = 2.85 m/s

Explanation:

By the law of similarity of the triangle we can say

$\frac{height\: of\: man}{distance\: of \: man\: from \: spotlight} = \frac{height \:of \:image}{distance\: of \:wall\: from\: spotlight}$

here we know that

height of man = 2 m

let the distance of man from spotlight = x

distance of wall from spotlight = 12 m

height of image is let say "y"

so we will have

$\frac{2}{x} = \frac{y}{12}$

$y = \frac{24}{x}$

now we have

$\frac{dy}{dt} = \frac{24}{x^2}\frac{dx}{dt}$

here we know

$\frac{dx}{dt} = speed = 1.9 m/s$

x = 4 m

now we have

$\frac{dy}{dt} = \frac{24}{4^2}(1.9)$

$v = 2.85 m/s$

8 0

4 years ago

Give v=120m/s north and t = 10.2, calculate the displacement

Sedbober [7]

Answer:

Displacement from the starting position is 1224m

Explanation:

The object is moving at 120 meters per second, it does this for 10.2 seconds. Use multiplication to find the answer.

$120 \times 10.2 = 1224$

4 0

3 years ago

You are operating a pwc. you are heading straight toward a dock. you turn the engine off and then turn the steering control hard

White raven [17]

In this case, the PWC will head for the dock. This is because, power needs to be applied in order to maintain steering control. If the throttle is left to idle or if the engine is turn off during operation, all steering control will be lost. In each of this situation, the PWC will continue in the was headed before the engine was turned off or before the throttle was left to idle.

6 0

4 years ago

A figure shows a vertically moving block on the end of a cord. The graph next to the figure gives the vertical velocity componen

Sergio [31]

It should be 2/9/10 in functional form

3 0

4 years ago

The uncertainty in the position of an electron along an x axis is given as 53 pm, which is about equal to the radius of a hydrog

Jobisdone [24]

To solve this problem it is necessary to apply the concepts related to the Heisenberg's uncertainty principle. Under this principle we understand the relationship that the minimum range of error in position (x) times the minimum range of error in momentum (p) is, at a minimum, about equal to the Planck constant, mathematically that is,

$\Delta p = \frac{h}{\Delta x}$

Replacing with our values we have,

$\Delta p = \frac{6.63*10^{-34}J\cdot s}{2\pi (53*10^{-12}m)}$

$\Delta p = 1.99*10^{-24} kg\cdot m/s$

Therefore the least uncertainty in any simultaneous measurement of the momentum component px of this electron is $1.99*10^{-24} kg\cdot m/s$

4 0

3 years ago