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2 years ago

Which elements have similar behavior? barium silicon aluminum strontium osmium beryllium

Physics

1 answer:

choli [55]2 years ago

5 0

Answer:

barium strontium and beryllium

Explanation:

they all are reactive to air and are alkaline earth metals

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What depends on public opinion and support?

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Answer: A.) Regulations at a local level.

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2 years ago

A virtual image is formed 17.0 cm from a concave mirror having a radius of curvature of 39.0 cm. (a) Find the position of the ob

Wittaler [7]

Explanation:

Image distance, v = -17 cm (-ve for virtual image)

Radius of curvature of concave mirror, R = 39 cm

Focal length, f = -19.5 cm (-ve for a concave mirror)

(a) Using mirror's formula as :

$\dfrac{1}{v}+\dfrac{1}{u}=\dfrac{1}{f}$

$\dfrac{1}{u}=\dfrac{1}{f}-\dfrac{1}{v}$

$\dfrac{1}{u}=\dfrac{1}{-19.5}-\dfrac{1}{(-17)}$

u = 132.6 cm

So, the object is placed 132.6 cm in front of the mirror.

(b) Magnification of the mirror, $m=\dfrac{-v}{u}$

$m=\dfrac{-17}{132.6}$

m = -0.128

Hence, this is the required solution.

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3 years ago

How do plants absorb light energy from sun

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There are plant cells called chloroplasts, plants leave chloroplasts which have chlorophyll that capture and absorb light energy from the sun.

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2 years ago

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Consider an ideal gas at 27.0 degrees Celsius and 1.00 atmosphere pressure. Imagine the molecules to be uniformly spaced, with e

antiseptic1488 [7]

Answer:

The length of an edge of each small cube is 3.43 nm.

Explanation:

Given that,

Temperature of ideal gas =27.0°C

Pressure = 1.00 atm

We need to calculate the length of an edge of each small cube

Using gas equation

$PV=nRT$

$PV=NkT$

$V=\dfrac{NkT}{P}$

For, N = 1

Where,

N = number of molecule

k = Boltzmann constant

T = temperature

P= pressure

Put the value into the formula

$V=\dfrac{1\times1.38\times10^{-23}\times(27+273)}{1.03\times10^{5}}$

$V=4.019\times10^{-26}\ m^3$

Now, for the cube

$V=L^3$

$L=V^{\frac{1}{3}}$

$L=(4.019\times10^{-26})^{\frac{1}{3}}$

$L=3.43\times10^{-9}\ m$

$L=3.43 nm$

Hence, The length of an edge of each small cube is 3.43 nm.

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3 years ago

Tommy was walking at a rate of 4 miles hour at noon and at 12:30 pm he was walking at a brisk rate of 6 miles hour . Two hours l

maks197457 [2]

Answer:

B) Tommy had a positive acceleration between noon and 12:30 pm.

Explanation:

Acceleration is defined as the rate of change of velocity:

$a=\frac{v-u}{t}$

where

v is the final velocity

u is the initial velocity

t is the time

In the problem,

- At noon, Tommy is walking at a velocity of 4 mi/h

- At 12.30 pm, Tommy is walking at a velocity of 6 mi/h

- A time of half an hour (0.5 h) passed between the two moments

So Tommy's acceleration is

$a=\frac{6 mi/h-4 mi/h}{0.5 h}=4 mi/h^2$

and the acceleration is positive, since the velocity has increased.

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2 years ago

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Which elements have similar behavior? barium silicon aluminum strontium osmium beryllium ​

Which elements have similar behavior? barium silicon aluminum strontium osmium beryllium