Answer:
It is given that the image is formed at a distance of 50cm from the lens. And since the image is real, v = +50cm. This means that u = -50cm. Therefore, the needle must be placed at a distance of 50cm from the lens.
Explanation:
Answer:
Explanation:
a )
Refractive index of ice = sini / sin r where i is angle of incidence and r is angle of refraction
angle of incidence = 90 - 45 = 45
angle of refraction = 30
refractive index of ice μ = sin 45 / sin 30
= 2/ √2
μ = √2 = 1.414
μ = 1 / sin C where C is critical angle for ice - air interface
sinC = 1 / μ
= 1 / 1.414
= .70
C = 44 .42° .
b )
real depth / apparent depth = refractive index
2 / apparent depth = 1.414
apparent depth = 2 / 1.414
= 1.414 cm .
Acceleration is a change in velocity, either an increase in speed or a change in direction. Acceleration measures the rate of change of an object's velocity. Average acceleration is calculated by dividing the change in velocity over the time.
Answer:
Price elasticity of demand = 0.25
Explanation:
The detailed steps and appropriate derivation is as shown in the attached file.
<u>Answer</u>:
<em>Dog drinking water after it feels thirsty is an example of an organism responding to its internal environment to maintain homeostasis.
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<u>Explanation</u>:
The regulation of temperature of the body of an organism is called homeostasis. <em>Warm blooded organisms depend on their internal environment to maintain homeostasis while cold blooded organisms</em> completely depend on their external environment to maintain homeostasis.
The <em>body temperatures of warm blooded organisms maintain its constancy despite changing temperature of the external environment</em>. But the case of cold blooded organisms is different.
Their body temperature completely depends on the external environment and thus they have<em> several behavioral and physiological adaptations to maintain their body temperatures </em>at the comfortable level.
<em>In this example dog is a warm blooded animal and it drinks water to maintain homeostasis since water helps in thermal regulation of its body.
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