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3 years ago

Please answer the following essay question:

Physics

1 answer:

g100num [7]3 years ago

5 0

Explanation:

The atoms of elements such as hydrogen, sodium and potassium have only one electron in their outermost electron shell while atoms such as calcium, iron and chromium have several loosely held electrons. The bond would be almost entirely covalent. Ionic bonds form between atoms of very different electronegativities, e.g. sodium and chlorine, in which case the electron is largely removed from the sodium atom and transferred to the chlorine atom, resulting in sodium(+) chloride(-) ionic bonding

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What energy transformations take place when you turn on a fan?

Snezhnost [94]

Answer:

Electrical energy to kinetic energy

Explanation:

The transformation that occurs when turning on a fan is electrical energy to kinetic energy.

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2 years ago

In the Olympic shot-put event, an athlete throws the shot with an initial speed of 12.0 m/s at a 40.0 ∘ angle from the horizonta

Gre4nikov [31]

Answer:

Explanation:

given,

initial speed of the shot = 12.0 m/s

angle = 40°

height at which shot leaves her hand = 1.80 m

v_x = 12 cos 40° = 9.19 m/s

v_y = 12 sin 40° = 7.71 m/s

time to reach maximum height =

= $\dfrac{v_y}{g}$

= $\dfrac{7.71}{9.8}$

= 0.787 s

$h = v_y t + \dfrac{1}{2}gt^2$

h = 7.71 × 0.787 - 0.5 × 9.81 × 0.787²

h = 3.03 m

the maximum height attain = 3.03 + 1.8 = 4.83 m

now free fall from the maximum height

$h =\dfrac{1}{2}gt^2$

$4.83 = \dfrac{1}{2}\times 9.8 \times t^2$

t = 0.9928 s

total time = 0.9928 + 0.787 = 1.7798 s

range =

d = vₓ t

d = 16.36 m

8 0

3 years ago

How could you use the barometer to determine the height of a building?

Nady [450]

Take the barometer to the roof of the building. Drop the barometer from the edge of the roof, and, with your wrist watch or a stop watch, measure the time it takes for the barometer to hit the ground or the street below. Then the height of the roof, in meters, is 4.9 times the square of the time in seconds.

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3 years ago

A vertical tube 1.34 m long is open at the top.It is filled with 44.2 cm of water.If the speed of sound is 344 m/s, what willthe

tester [92]

Answer:

the fundamental resonant frequency is 95.76 Hz

Explanation:

The computation of the fundamental resonant frequency be is given below:

= 1.34 m - 0.442 m

= 0.898 m

Now

$L = \frac{\lambda}{4} \\\\\lambda = 4L$

Now the fundamental resonant frequency is

$f = \frac{V}{\lambda} \\\\= \frac{V}{4L}\\\\= \frac{344}{4\times 0.898}$

= 95.76 Hz

hence, the fundamental resonant frequency is 95.76 Hz

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3 years ago

The surface of the planet Jupiter is believed to consist of liquid hydrogen Above this surface lies a thick atmosphere that exer

lesya [120]

Answer:b

Explanation:

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3 years ago