Answer:
Explanation:
Sun's dynamo means the process that produce Sun's magnetic field.
The mechanism inside a Sun acts like a generator that produces electric current and magnetic field.
Magnetic field with in the Sun are extended out and around. Magnetic field of lines get twisted due to rotation of Sun.
The material that flows inside the Sun plays an important role in Sun's dynamo. At surface the flow rate is about 20 m/s but as it moves towards equator, it becomes way too slow taking about 11 years of time.
Due to the this magnetic field, several sun spots are formed on the surface.
The number of sunspots keep on changing from minimum to maximum number resulting into change in the magnetic pole. In each cycle polarity get reversed hence the overall magnetic cycle has an interval of 22 years.
Answer:
The jug drowns because the density of the jug is more than that of the density of water.
d.) a and b only
This is because sound needs a medium to travel. It can travel in a solid (the fastest) and air for example. Sound waves cannot propagate through a vacuum and since space is a vacuum the answer is a and b only.
Answer: a) 1.846m
b) 0.923m
Explanation: given that height h = 1.9m
Assume his eyes are 5.4 cm below the top of his head
5.4 cm = 5.4 / 100 = 0.054 m
1.9 – 0.054 = 1.846 meter
The top of the mirror should be placed at 1.846m
That is the vertical distance from his eyes to top of his head.
Light must travel from the top of his head to the mirror in order for him to see the head. Then travel from this position to his eyes. To do this, the mirror must be placed at a position that is halfway between his eyes and the top of his head.
The minimal vertical distance from the level of the person’s eyes to the top of the mirror will be:
d = ½ ×1.846 = 0.923 meters
