Answer:
4
Explanation:
You assume that when they were writing two zeroes after the decimal point, they wanted to show that these are significant in determining the precision of this number.
Answer: Option (a) is the correct answer.
Explanation:
Sunspots are defined as the dark and cooler areas on the surface of the Earth. A sunspot is present in a region known as photosphere.
Temperature of a sunspot is about 3,800 degrees Kelvin whereas photosphere has a temperature of about 5,800 degree kelvin.
Thus, we can conclude that out of the given options, the statement they are areas of the sun that are "burnt out" is false about sunspots.
The inner core is composed of the earth's crust and solid upper mantle.
Answer:
Charges, 
Explanation:
Given that,
Radius of the balls is 2 mm
The force of repulsion acting on the balls, F = 2.75 N
The separation between the spheres, d = 5.33 cm = 0.0533 m
The force of repulsion between charges is given by :
So, the charge on the spheres is . Hence, this is the required solution.
