Answer:
120 N
Explanation: First we shoud consider the forces acted on a tree
Friction foce - acting opposite to the moving direction
Weight - Directly acting downwards
Reaction - Directly acting on upwards
For minimum required force should be equal to the friction force
F = μ R
F = 0.5×480
= 120N
Answer:
the bigger the mass, the smaller the acceleration and the smaller speed
Explanation:
this can be proven from the formula F = ma
F = m×speed/time
Or a practical example is that of a heavy object and a light object if pushed with the same force, it'll be observed that the small object moves faster or with a greater speed than the heavy object
of 20 m/s, what is the centripetal force acting on the car?
O
A. 6118 N
O
B. 1300 N
O C. 7982 N
O D. 305.9 N
SUBMIT
Answer:
6118N
Explanation:
B. -2
C. +2
D. +1
When a potassium atom loses one electron, it forms a potassium ion. Since electrons carry a negative charge, losing one electron results in an overall positive charge for the ion. Therefore the correct answer is (D).
A potassium atom normally has 19 protons and 19 electrons. The number of protons and electrons is equal, so the atom is electrically neutral overall.
However, when a potassium atom loses one electron, it means that it now has 19 protons and only 18 electrons. Since protons are positively charged and electrons are negatively charged, losing one negatively charged electron leaves the atom with a net positive charge.
Since there is one more positive charge than a negative charge, the potassium ion has a positive charge of +1. This means the potassium ion has one more positive charge than it has negative charges, making it a cation with a +1 electrical charge.
In summary, when a potassium atom loses one electron, it becomes a potassium ion with a positive charge of +1. Therefore the correct answer is (D).
To know more about the potassium atom:
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