Answer:
A) Polaris, the North star
Explanation:
Polaris, also known as the Pole star or north star, lies almost along the axis of Earth. Because of this Polaris seems to be fixed at one point in the sky while all other celestial objects change their positions in the sky due to rotation of Earth.
Since, it is fixed at one point in the sky in the North direction, explorers used to take help of Polaris to find direction in the night time. Since Polaris is not the brightest star in the night sky (it is 48th brightest star) our ancestors took help of constellations to find it. One of the method was to use Big Dipper of "Ursa Major" constellation. The pointer stars (Merak and Dubhe) of big dipper point towards the Polaris. One can easily spot it in the sky as well.
Answer:
The velocity of an object must include these two things <u>displacement</u> and <u>time</u><u>.</u>
Explanation:
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Answer:
(A) Force on the object will be 58.85 N
(B) Apparent weight will be equal to 57.21 N
Explanation:
We have given mass of Neptune m = 1026 kg
Radius R = 25000 Km
Time period = 16 hour
We know that 1 hour = 3600 sec
So 16 hour = 16×86400 = 57600 sec
Acceleration due to gravity at north pole of Neptune
(A) Mass of the object m = 5.5 kg
So gravitational force on the object
(B) Velocity will be equal to
Apparent weight of the object will be equal to
The density of <u>a medium</u> is the second factor that <u>affects the speed of sound.</u>
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