<u>Answer:</u>
Rowboat arrives 0.558 miles to the upstream when it reaches the opposite shore.
<u>Explanation:</u>
Velocity of rowboat = 3.30 mi/h
Angle with north of west = 62.5⁰
Width of river = 0.505 mile.
Velocity of river = 1.25 mi/hr eastward.
Let us take east as positive X -axis and North as positive Y-axis.
So angle of boat with horizontal axis = (90+62.5) = 152.5⁰
Horizontal speed of boat = 3.30*cos 152.5 = -2.93 mi/h
Vertical speed of boat = 3.30*sin 152.5 = 1.52 mi/h
Horizontal speed of river = 1.25 mi/h
Time taken to cross river = Width of river/Vertical speed = 0.505/1.52 = 0.33 hour.
Velocity along upstream of river = -2.93+1.25 = -1.68 mi/hr
So distance moved along upstream = -1.68*0.33 = -0.558 miles ( negative sign means along west direction)
It reaches 0.558 miles to the upstream when it reaches the opposite shore.
Answer:
1.The Sun is located at one of the foci of the planets' elliptical orbits.
2.The path of the planets around the Sun is elliptical in shape.
Explanation:
As per Kepler's law of planet motion we know that all planets revolve around the sun in elliptical path in such a way that position of Sun must be at one of the focii of the path
So all planets are in elliptical path always
Position of sun is always at one of the focus
so correct answer will be
1.The Sun is located at one of the foci of the planets' elliptical orbits.
2.The path of the planets around the Sun is elliptical in shape.
<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.
</em>
<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.
</em>