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sleet_krkn [62]
3 years ago
5

Wich of these is not a sign of chemical change 1 A gas is given off

Physics
1 answer:
mash [69]3 years ago
5 0
<h3>Answer:</h3>

2. The material dissolves

<h3>Explanation:</h3>

The Question tests the understanding of chemical change and whether we know the signs that show its occurrence.

First we need to know what is chemical change;

  • Chemical change is a type of change that involves formation of a new substance different from the original substance.

Second we need to identify the signs that indicate the occurrence of a chemical change

  • Chemical change in chemical reactions is characterized by various signs which include;
  1. Production of bubbles
  2. Color change
  3. Formation of a precipitate
  4. Change of odor
  5. Change in temperature.
  • Therefore, in this case, the material dissolving is not a sign that chemical change has taken place.
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Long handle length x small force = short blade length x large force
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3 years ago
The maximum electric field strength in air is 3.0 Mv/m . Stronger electric fields ionize the air and create a spark. What is the
adoni [48]

Answer:

The value is  P_{max} =  2.11 * 10^{6} \  W

Explanation:

From the question we are told that  

    The maximized electric field strength is  E =  3.0 \ MV/m = 3.0 *10^{6} \  V/m

     The diameter is  d =  1.5\ cm  =  0.015 \  m

Generally the cross -sectional area is mathematically represented as

 =>      A =  \frac{\pi * d^2 }{4}

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Generally the maximum power is mathematically represented as

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Here c is the speed of light with value  c =  3.0 *10^{8} \  m/s

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2 years ago
When you hold a cold glass of water in your warm hand, which way does the heat flow ?
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6 0
3 years ago
Keaton is asked to solve the following physics problem:
RideAnS [48]

Answer:

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Explanation:

In physics there is some basic fomula that sir Isacc Newton proposed under the topic of motion. The three formulas are below;

<em>1) v=u+at</em>

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a=acceleration/Speed of the body

t= time taken by the body while travelling

s= displacement of the body.

Therefore to solve keatons problem, the factors(variables) in the formulas above need to be systematically considered. Since the ball was dropped from the top of the building, the initial velocity is 0 because the body was at rest. Also the acceleration will be acceleration due to gravity (9.8m/s^2)

5 0
3 years ago
पत्र- अपने क्षेत्र की सड़कों की बुरी दशा की जानकारी देते हुए और उन्हें ठीक कराने की प्रार्थना करते हुए नगर निगम अधिकारी को पत्र
Ksivusya [100]

Answer:

पत्र- अपने क्षेत्र की सड़कों की बुरी दशा की जानकारी देते हुए और उन्हें ठीक कराने की प्रार्थना करते हुए नगर निगम अधिकारी को पत्र लिखिए |

5 0
2 years ago
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