Answer:
0.08 meters.
Explanation:
Extension= increase in length (∆L).
E= 21-13=8 cm
To convert cm to m, divide by 100
8 cm= 0.08 m.
Answer:
the charge of the bees must be of the same sign
Explanation:
The electric field is given by the relation
E = k q / r²
This electric field has outgoing direction if the charge is positive and incoming towards the charge if it is negative.
The force generated by this field on a test charge is
F = q E
Since the charge is a scalar, the direction of the force is the same as the electric field.
In this case the two flowers are at a certain distance and the two charged bees land on them, so the force on a test charge is the vector sum of the force that each bee creates, so that this force is subtracted from the two bees must have the same charge sign.
The force created by the bee on the left goes to the right and the force created by the bee on the right goes to the left, so the forces are subtracted,
Consequently the charge of the bees must be of the same sign
melting point of a substance depends on pressure too. at high pressure , the melting point also shifts to higher level. and at low pressure , the melting point shifts to lower level. the inner core of earth is mostly made of iron and temperature inside earth is much higher than the normal melting point of the iron. so ideally the iron inside the core must be in molten state but in reality it is in solid state there because the pressure at the core is very high. due to this high pressure , the melting point of the iron becomes higher than its normal value and hence it does not melt inside the core.