Answer:
<em>We need to (at least) apply a force of 9.8 N to move the block</em>
Explanation:
<u>Second Newton's Law</u>
If a net force 
different from zero is applied to an object of mass m, then it will move at an acceleration a, given by
If we apply a force F to an object placed on a rough surface, the only way to make it move is to beat the friction force which is given by
Where 
is the static friction coefficient and 
is the normal force exerted by the table to the object. Since there is no motion in the vertical direction the normal force equals the weight of the object:
The friction force is
Thus, we need to (at least) apply a force of 9.8 N to move the block
I’m not completely sure but if I had to guess I would say lithium oxide
Explanation:
Water is compound made up of hydrogen and oxygen atoms.
Hydrogen and oxygen are elements that are joined together to form water.
A compound is a substance composed of two or more kinds of atoms/elements joined together in a definite grouping. The properties of a compound are different from those of the individual elements that are combined to make them up.
Water is made up of hydrogen and oxygen atoms in a ratio of 2 to 1;
An element is a distinct substance that cannot split up into simpler substances. Such substances are made up of one kind of atom. Hydrogen and oxygen are elements.
learn more:
compound brainly.com/question/10585691
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The magnitude of the electric field in the wire is 8 V/m.
<h3>What is electric field?</h3>
This is the region of space where the effect of magnetic force is felt.
The electric field in the wire is calculated as follows;
E = V/d
where;
- V is potential difference in the wire
- d is the distance of separation
Substitute the given parameters and solve for electric field.
E = 4 V / 0.5 m
E = 8 V/m
Thus, the magnitude of the electric field in the wire is 8 V/m.
Learn more about electric field here: brainly.com/question/26199225
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The correct answer to the question is- zero i.e no work is done by the body.
CALCULATION:
As per the question, the force applied by waiter on tray F = 5.0 N.
The waiter is carrying the tray above his head .
Hence, displacement of waiter = displacement of tray.
Hence, displacement of the tray S = 10.0 m
The angle between force and displacement is 90 degree as the normal force on book is vertically upward and displacement is in horizontal direction.
Hence, amount of work done is calculated as -
Work done W = 
= 
= 
= 5.0 N × 10.0 m × 0
= 0.
Hence, the work done will be zero.
