2 years ago

Learning Activity (#aqph058) AQ13PH_AQPH058_01 - Google Chrome

Physics

1 answer:

Kobotan [32]2 years ago

7 0

Speed = (frequency)•(wavelength)

Speed = (2 Hz)•(2.5 m)

Speed = 5 m/s (choice-D)

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Ionic compounds form crystal structures. molecular structures. pure elements. neutral elements

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Answer: Option (a) is the correct answer.

Explanation:

Ionic compounds are the compounds whose atoms are combined together by transfer of electrons.

An ionic compound has partial positive charge on the cation and partial negative charge on anion.

For example, NaCl is an ionic compound whose atoms are arranged orderly due to the opposite charges on its atoms.

So, an ionic compound forms a neutral compound but not a neutral element.

Thus, we can conclude that ionic compounds form crystal structures.

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A. Reduced greenhouse gas emissions.

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You need to have the Mass and velocity

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44. A rescue helicopter is hovering over a person whose boat has sunk. One of the rescuers throws a life preserver straight down

Vladimir [108]

Answer:

18.4 m

Explanation:

(a)

The known variables in this problem are:

u = 1.40 m/s is the initial vertical velocity (we take downward direction as positive direction)

t = 1.8 s is the duration of the fall

a = g = 9.8 m/s^2 is the acceleration due to gravity

(b)

The vertical distance covered by the life preserver is given by

$d=ut + \frac{1}{2}at^2$

If we substitute all the values listed in part (a), we find

$d=(1.40 m/s)(1.8 s)+\frac{1}{2}(9.8 m/s^2)(1.8 s)^2=18.4m$

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2 years ago