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Preeti Dabral 3 years, 2 months ago
First calculate the total distance traveled using the odometer.
starting reading at 1:25 was 24830 km
end reading at 3:15 was 25005
Therefore total distance traveled was 25005km - 24830km = 175 km
Total time taken between 1:25pm and 3:15 pm 3:15
-1:25
1hr 50 mins
1 and 5/6 hours = 11/6 hrs
Speed = distance/time
175 ÷ 11/6 = 175 × 6/11
95.45 km/hr
speed in m/s.....multipy by 1000/3600
95.45 × 10/36
= 26.52 meters/second
Posted by Smruti Prava Dey 3 years, 2 months ago
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Preeti Dabral 3 years, 2 months ago
AB²=98
AC=BC. (since it is an isosceles triangle, two sides are equal)
by Pythagoras theorem,
AB² = AC² + BC²
we know AC = BC,
therefore substitute
AB² = AC² + AC²
98 = 2AC²
98/2 = AC²
49 = AC²
therefore,. AC = √49
AC = 7
AC = BC = 7
Posted by Sai Sibam 3 years, 2 months ago
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Preeti Dabral 3 years, 2 months ago
She lives in a slum which is very filthy. Her daughter is sick but she cannot skip work because she needs to borrow money from her employers to take her daughter to the doctor. Her job as domestic help is not permanent. She can be removed by her employers at any time.
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Preeti Dabral 3 years, 2 months ago
- A change in which the molecules are rearranged, but their internal composition remains same is called Physical Change. A process in which the substance transforms into a new substance, having a different chemical composition, it is known as Chemical Change.
- Some common examples of physical change vaporisation, condensation, freezing/melting/boiling of water. On the contrary, the examples of chemical change are combustion, metabolism, cooking of egg, etc.
- Physical change is a temporary; they are easily reversible. As against this, the chemical change is permanent in nature, i.e. they cannot be reversed, even by reversing conditions.
- In the physical change, only the form of the substance is changed, but no new product is formed. On the other hand, when there is a chemical reaction, a completely different product is formed, whose properties are completely different from that of the reacting substances.
- In a physical change, the original matter can be recovered, by simple physical methods. As opposed, in chemical change the original matter no longer exist, and so it cannot be recovered.
- In the physical change, change in the physical attributes of the substance is observed, such as shape, size, appearance, texture, odour, density and so on. Conversely, chemical change involves the change in chemical properties of the substance, i.e. change in its chemical nature.
- In the physical change, no or very little amount of energy is absorbed or given out as heat, light or sound energy. Unlike chemical change, wherein enormous energy is absorbed or given out as heat, light or sound energy
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Preeti Dabral 3 years, 2 months ago
Given:- AB=ADCB=CD
To prove;- △ABC≅△ADC
Proof:-
In △ABC and △ADC,
AB=AD(Given)
CB=CD(Given)
AC=AC(Common)
∴△ABC≅△ADC(By SSS congruence property)
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Preeti Dabral 3 years, 2 months ago
The cheetah is the fastest land animal and can achieve a peak velocity of 100 km/h up to the distances less than 500 m.
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