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3 years ago

3. What is the main difference between a physical change and a chemical

Physics

1 answer:

Lana71 [14]3 years ago

3 0

Answer:

B and D could both be right as they are quit similar.

Consider two rods of the same length and diameter,

Increasing the diameter of one would change the expansion qualities of that rod even though there would be no chemical changes,

However, leaving the physical appearance of both rods the same while applying a reactive substance (acid or something) to one of the rods would not necessarily change the physical appearance of that rod but could make a considerable change in the physical properties of that rod.

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A 4.0 kg mass is attached to a spring whose spring constant is 950 N/m. It oscillates with an amplitude of 0.12 m. What is the m

Fudgin [204]

Answer:

velocity = 2.62m/s

Explanation:

950= (4 x A)/0.12

950 x 0.12 = 4 x A

114 = 4 x A

A = 114/4

A = 28.5m/s²

U²=2as
U² = 2 x 28.5 x 0.12
U² = 6.84
U = √6.84
U = 2.62m/s

3 0

3 years ago

If the gas inside the flask in the above exercise is cooled so that its pressure is reduced to a value of 715.7 torr, what will

evablogger [386]

Answer:

(a) 49.0 mm

Explanation:

#First we need to calculate the height of the mercury arm:

Reduced pressure is 715.7torr, Initial Pressure is 797.3torr, Required pressure is:

$P_g_a_s=P_a_t_m+P_h\\$

The difference in the two arms will give the pressure difference between the gas placed in the flask attached to an open-end mercury manometer.

$P_g_a_s=P_a_t_m+P_h\\797.3=P_a_t_m+(136.4mm-103.8mm)\\P_a_t_m=764.7mm\\\\h_t_o_t_a_l=136.4mm+103.8mm=240.2mm\\\\P_g_a_s=P_a_t_m+\bigtriangleup h\\\bigtriangleup h=P_g_a_s-P_a_t_m\\\\\bigtriangleup h=715.7mm-764.7mm\\=-49mm$

Hence the height of the mercury in the arm is 49.00mm

4 0

3 years ago

Identify the force acting on the mass that causes the spring to extend

blsea [12.9K]

Jjjj. Uirhrhhruuegrur

4 0

3 years ago

For years, marine scientist were mystified by sound waves detected by underwater microphones in the Pacific Ocean. These so-call

pychu [463]

Answer:

225 m

Explanation:

$f$ = Frequency of the T wave = 6.8 Hz

$v$ = Speed of sound in seawater = 1530 ms⁻¹

$\lambda$ = Wavelength of the T wave

we know that, frequency, speed and wavelength are related as

$wavelength = \frac{speed}{frequency}$

$\lambda = \frac{v}{f}$

Inserting the values, we get

$\lambda = \frac{1530}{6.8}\\\lambda = 225 m$

7 0

3 years ago

Which of the following is an engineering solution

Alona [7]

By "solution" it means a course of action that, once carried out, brings about some desired state of affairs. The use of engineer in this context is as a verb meaning "to arrange or bring about through skillful, artful contrivance."

5 0

3 years ago

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